Keithley Metrabus User Manual

Download

MetraBus User’s Guide

Keithley Instruments, Inc.

28775 Aurora Road, Cleveland, OH 44139

Technical Support: I-888-KEITHLEY

Monday -Friday 8:00 a.m. to 5:OO p.m. (EST)

Fax: (440) 248-6168

httD://www.keithlev.com

Revision F - July, 1994

Pari Number: 62470

The information contained in this manual is believed to be accurate and reliable. However, Keithley Instruments, Inc., assumes no responsibility for its use or for any infringements of patents or other

rights

of third parties that may result from ik use. No license is granted by implication or otherwise

under any patent

righk

of Keithley Instruments, Inc.

KEITHLEY INSTRUMENTS, INC., SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RELATED TO THE USE OF THIS PRODUCT. THIS PRODUCT IS NOT DESIGNED WITH COMPONENTS OF A LEVEL OF RELIABILITY SUITABLE FOR USE IN LIFE SUPPORT OR CRITICAL APPLICATIONS.

Refer to your Keithley hWrumenk license agreement and Conditions of Sale document for specific warranty and liability information.

MetraByte is a trademark of Keithley hMru.menk, Lnc. AU other brand and product names are

&ademarks or registered trademarks of their respective companies.

@Copyright Keithley Instruments, Inc.

1991,1992,

1993,1994

Au rights reserved. Reproduction or adaptation of any part of this doctunentation beyond that permitted by Section 117 of the 1976 United States Copyright Act without pem&zion of the Copyright owner is unlawful.

Keithley MetraByte Division

Keithley

Instruments, Inc.

440 Myles Standish Blvd., Taunton, h4A 02780

TEL 508/880-3000 * FAX 5081880-0179

Contents

CHAPTER 1

i::

- INTRODUCTION General Overview.

The MetraBus Cable

..................................

MetraBus Boards

::: 2

1:7

Mounting & Connection.

MetraBus Addressing

Programming

Additional Notes

............................ : : : : : : : : : : : : : : : : : : : II-3

.................................

.....................................

....................................

CHAPTER 2 - THE CONTROLLER BOARDS

Part 2A: MDB-64 Driver Board

2A.1 2A.2 2A.3 2A.4 2A.5 2A.6 2A.7 2A.8

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : I??-;

Features

Specificat’ions : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : . 2A-2

Setting The Base Address Switch . . . . . . . . . . . . . . . . . . . . . . . . . . 2A-2

Installing The MDB-64 Fuse (Fi) . . . . . . . . . . . . . . . . . . . . . . . . . . 2A-3

Installing The MDB-64 Driver Card

The MDB-64 MetraBus Connector. : : : : : : : : : : : : : : : : : : : : : : : : . 2A-4

Programming The MDB-64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2A-4

Part 2B: MID-64 Driver Board

28.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . .28-l

2B.2

28.3

Features

Specificat’ions : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : .2B-2

Setting The Base Address Switch . . . . . _ . . . . . .

z-i 2B:6 2B.7 2B.8

Use 0-t The Auxiliary Supply . . . . . . . . . . . . . . . : : : : : : : : : : : : . . .2B-3

Installing The Mid-64 Drier Card . . . , . . . . . . . . . . . . . . . . . . . . . . 28-3

The MID-64 MetraBus Connector . . . , . . . . . . . . . . . . . , , . . . . . . . 2B-4

Programming The MID-64 . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . 2B-5

,1-l

l-l 1-2

.I-4 .I-4

l-6

. 2A-3

. 2B-2

. . 2B-2

Part 2C: pCMDB-64 Driver Board

2c.1 General 2c.2 2C.3 2C.4 2c.5

Specifications 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Use Of An Auxiliary Power Supply. . . . .

System Configuration. . . . . . . . , . ; .

Programming . . . . . . . . . . . . . . . .

1 1 1 1 1 1 1 1 1

1 1 1

. . . . . . . . .

. . .

. . . . . . . . .

. . .

. . . . . . . . .

. . .

1 1 1 1 1 1

. . . . . .

. . , . . .

1 1 . . .2C-2 . . .2C-2 . . .2C-7

Part 2D: REhh-64 Driver Board

2D.I General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2D-1

2D.2 Features. . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . .2D-2

2D.3

g$;E;tions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : : :X$-g

2D.4 2D.5 2D.6 2D.7

2D.8

Connectors’ : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : . * 2D-5

Use of An Auxiliary Power Supply . . . . . . . . . . . . . . . . . . . . . . . . : : zLD-77

Installation Of The REM-64. . . . . .

Programming The REM-64 To Control ‘M’etraBus : : : : : : : : : : : : : : : : . . 2D-8

. . .

- Ill -

.2c-1 .2C-1

Contents

CHAPTER

- THE POWER SUPPLY

Part 3A: PWR-ZVPWR-100 Boards

3A.1

3A.2 3A.4

3A.3 3A.5

3A.6

General, , . . . . .

Features Specifications’ : : 1 1 1 1 1 1 1 1

Installing The PWR-55/PWR-100 Use of Other Power

TheMTAP- . . . . Supplies . . . . . . .

Part 38: MBUS-PWR Boards

3B.1 3B.2 3B.3 3B.4 3B.5 3B.6

38.7

CHAPTER 4 -

General........................,.............:.

Features

Specifications’ 1 1 1 1 1 1 1 1 1 Installation . Use of Output Ground Jumper

The MATP-1

The MBUS-PWk ‘cbnnkdtdrs :

. . . . . .

MDI-16/M%-16 SOLID STATE SWITCHING I/O SYSTEM

General, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . 4-1

Features

Specifications 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Using An Auxiliary Supply . . . . . . . , . . . . . . . . . . . . . . . . . . . .

Configuring The MSS-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . : : . 4-2

Installing The MDI-16

BOARDS

. . . . . . .

. .

. . .

. .

1 1 1 1 .

. . .

1 1 1 . .

. . . . . . .

1 1 1 1 1 1 1 1 : : : : : : : : : : : : : : : :

. . . .

. .

. . .

1 1 1 1 1

1 1 1

. . . .

. . .

. .

. . . . . . . . . .

1 1 1 1 : : : :

1 1 1 1 1 1 : : : : : :

: : : : : : : : : :

. . . . . .

: 1 1 1 1

. . . . . .

. .

1 1 1

. . .

. . . 1 1 1

. .

. . . . . . . . . 3A-2

1 1 1 1 1 1 1 1 1 38-2 : : : : : : : : : 3B-3 : : : : : : : : : 3B-3

3A-1 3A-1 3A-2 3A-2

3A-3

3B-1 3B-2 3B-3 3B-3

;::

. 4-2

CHAPTER 5 -

THE RELAY BOARDS

Part 5A: MEM-8 Electromechanical Relay I/O System

5A.l 5A.2 5A.3 5A.4 5A.5 5A.6

Part

58: MEM-32/A

58.1 5B.2 5B.3 5B.4 5B.5 5B.6 5B.7 5B.8

General. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications . . . . . . . . . , . . . . . . _ . . : ’ ’ ’ ’ * ’ . ’ ’ * *

Using An Auxiliary Power Supply Setting The MEM-8 Board Address : : : : : : : I- : : ’ * ’ . ’ . . ’ ’ ’ ’ ’ ’ * :

Programming The MEM-8 . . . . . . . . . . . . . . . : : : : : : : : : : : : : : . 5A-4

Use of Alternative Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A-5

& MEM-32/W Electromechanical Relay System

General. . . . . . . . . . . . . . . . . . . .

Features Specifications’ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Using An Auxiliary Power Supply Setting The MEM-32 Board Address : : : :

Typical Output Connections . . . . _ . . . .

Programming The MEM-32 . . Using Compiled Or Assembled ian&&-% ’

_. . . . . . . . . . . . . . . . . . “I._

....................

SA-1

!iA-3

SA-3 5A-3

5B-1 58-2 5B-2

E-33 58-4 5B-4 5B-7

- iv -

Contents

Part 5C: MSSR-32 Solid State Switching I/O Module

5C.l 5c.2

E-i 5c:5 5C.6

Part 5D: MCPT-8X8 Cross-Point, Matrix Relay Board

5D.l

5D.2 5D.3 5D.4 5D.5 5D.6 5D.7

CHAPTER 6 - THE LOGIC LEVEL l/O BOARDS

Part 6A: MIO-32 Isolated Digital Output Board

6A.l 6A.2 6A.3 6A.4 6A.5 6A.6 6A.7 6A.8

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SC-1

Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SC-2

Specifications

Use Of An AuxkySuppiy: : : : : : : : : : : : : : : : : : : : : : : : : : : : . .5C-2

Configuring The MSSR-32 . . . . , . . . . .

Installing The MSSR-32 . . . . . . . . . . . : : : : : : : : : : : : : : : : : : : : 5C-3

General Specifications : -1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Use Of An Auxrlrary Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . .5D-3

Jumpers And Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5D-3

Resistor Termination Networks. . Installing The MCPT-8X8. , . . . : : : : : : : : : : : : : : : : : : : : : : : : : : 5D-4

Programming The MCPT-8X8 . . . . . . . . . . . . . . . . . . . . . . . . . . . .5D-4

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6A-1

Features Specifications 1 1 1 1 1 1 1: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1: 1 1 Using An Auxiliary Power Supply

Installing The MIO-32. . . . . . . : : :

Typical Output Connections

Programming TheMIO-32 . : : : : : : : : : : : : : : : : : : : : : : : : : : : : .

Using Compiled Or Assembled Languages . . . . . . . . . . . . . . . . . . . . . 6A-7

. . SC-2

5c-3

. .5D-1 . .5D-2

5D-4

. 6A-2 . 6A-2

6A-3

: : : : : : : : : : : : : : : : : : : : : : 6A-3

. 6A-4

6A-5

Part 6B: MII-32 Isolated Digital Input Board

6B.1 6B.2

68.3 6B.4 6B.5 6B.6 6B.7 6B.8 6B.9

General

Features

Specifications

........................................

............

......... 1 1 1 1 1 1 1 1: 1 1 1 1 1 1 1 1 1 1 1 1: 1 1 1 1 1 1

Using An Auxiliary Power Supply Installing The MI!-32

...

.... : : : : : : : : : : : : : : : : : : : : : : : : :

Configuring The Mll-32 For Non-standard Inputs Typical Input Connections

Programming The Mll-32. : : : : : : : : : : : : : : : : : : : : : : : : : : : : : Using Compiled Or Assembled Languages

..................

.....................

6B-1 6B-2 6B-2 6B-3

68-3 654 6B-4

6B-5 6B-7

-V-

Contents

CHAPTER 7 - MCN-8 COUNTER/TIMER BOARD

;:: 2 T-56

7:7

7.8

7.9

CHAPTER 8 - THE ANALOG I/O BOARDS

Part 8A: MAO-8 Analog Output Board

8A.l 8A.2 8A.3 8A.4 8A.5 8A.6 8A.7 8A.8

Part 88: MAO-12 Analog Output Board

8B.l General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8B-1

8B.2 Features

8B.3 Specifications : : : 1 : : 1 : : : : : : : : : : : : : : : : : : : : : : : : : : : : . 8B-2

8B.4 8B.5

8B.6 Programming The MAO-1 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8B-5

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Features Specification’s* * : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 1 : : : . . 7-2

Use Of An Auxiliary Supply . . , . . . . . . . . . . . . . . . . . . . . . . . . . . , 7-3

Installing The MCN-8 Cascading The MCN-8’Coun’ters : : : : : : : : : : : : : : : : : : : : : : : : : : . 7-4

Typical Input Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Programming The MCN-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

Using Compiled Or Assembled Languages . . . . . . . . . . . . . . . . . . . . . 7-8

General.

Features

Specificatiork’.~ : : : : : : : : : : : : : : : : : : : : : : : : : : : : 1 : : : : : . 8A-2

Use Of An Auxrlrary Power Supply Installing The MAO-8

ProgrammingTheMAd-~:::::::::::::::::::::::::::: Calibration And Adjustment Of The MAO-8

Serviceable Parts ..... .. ..

Use Of An Auxiliary Power Supply . . . . . . . . . . . . . . . , . . . . . . , . . 88-3

Installing The MAO-1 2 , . . . . . . . . . . , . . . . . . . . . , . . . . . . . . . . 8B-3

.......................................

.......................

......................

. . 7-2

. 7-3

$A-1

. 8A-2

: : 883-z . . 8A:6

.;;;; ;

. 8B-2

Part 8C: MAI- Analog Input Board

8C.l General. . . .

8C.2

8C.3 8C.4 8C.5

8C.6 Typical Input Connections . . . . . . . s . , . . . . . . . . . . . .

8C.7 8C.8

8C.9 E4 :

8C:12

SC.13 Gain Selection Via Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8C-7

8C.14 3

Features . . . : : : : : : : : : : : : : : : : : : 1 : : : : : : : : : : : : : : : : : 8C-2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8C-2

Using An Auxiliary Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . 8C-3

Installing The MAI-I 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8C-3

Input Signal Attenuation . . . . . . . . . . . . . . . . . , . . . . . : : : : : : : i 883-z

Measuring Signals Greater Than +I 0 VDC . . . . . . . . . . . . . . . . . .

Measuring Signals Smaller Than +I .25 VDC . . . . . . . . . . . . . . . . . : : . 8&

Measuring Current With The MAI- 6 . . . . . . . . . . . . . . . . . . . . . . . . 8C-6

Auto Convert Mode Of Operation . . . . , . . . . . . . . . . . : . . . . . . . . . 8C-6

A/D Resolution Via Hardware . . . , . . . . , . . . . . . , . . . . . . . . , . . . 8C-7

Programming The MAI- 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , 8C-8

Using Compiled Or Assembled Languages Calibration Procedure For MAI- . , . . . : : : : : : : : : : : : : : : : : : : : 8C-13

- vi-

8C-1

8C-4

8C-12

Contents

Part 8D: MTHERM-20 Thermocouple Input Board

8D.l 8D.2 8D.3 8D.4 8D.5 8D.6

8D.7

8D.8

CHAPTER 9 - THE UTILITY BOARDS

Part 9A: MBB-32 Prototype/Breadboard

9A.1 General . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9A-1

9A.2 9A.3 9A.4 Installing The MBB-32 9A.5 9A.6 9A.7 9A.8

Part 9B: MDG-1 Diagnostic Board

9B.1

98.2

98.3 9B.4

General General

Functional bescnptidn’ 1 : : : : : : : 1 : : : : : : : : : : : : : : : : : : : : : : Functional bescnptidn’ 1 : :

Features Features Specifications 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Specifications 1 1 1 1 1 1 1 1 Installing The MTHERM-20.

Installing The MTHERM-20. . . . . . . . . . . . . .

Programming The MTHERM-20

Programming The MTHERM-20 .

Other Memory Locations . . . . . . . . . . . . . . . . . . . . . . . . . . _ . . . Other Memory Locations

Calibration Procedure. . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . Calibration Procedure.

Features . . , . . . . . . . . . . . . .

Specifications . . . . . . . . . . . . . : : : : : : : : : : : : : : : : : : : : : : : : 9A-2

MBB-32 l/O Connections : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 9A-3 The Read/Write

Programming The MBB-32. . . .

Possible Uses For The MBB-32 . : : : : : : : : : : : : : : : : : : : : : : : : : : 9A-6

General . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . ;JI;

Features. . . . . . . . . . . . . . . .

Installing The MDG-1 . _ , . . . . . . : : : : : : : : : : : : : : : : : : : : : : : : 98-2

Example Program. . . . . . . . . . . . ~ . . . . . . . . . . . . . . . . . . . . . .9B-2

Status Lines. . . . . . . . . . . . . . . . . . . . , . . . . . . . .

. . .

. . . .

: : : : 1

1 1 1 1 1

. .

. . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . .

: : : : : : : : : : : 1 1 1 1 1 1 1 1 1 1 1

. . . .

. . . . . :

. . . . . . . . . . .

: : : :

: : : : : 1 1 1 1 1

: : :

. . . . .

, . . . .

: : :

: : : : : : 1 1 1 1 1 1

. . _ . . .

. . . . . .

: : : :

. 8D-1 . 8D-2 . 8D-2 , 8D-2 _ 8D-3

: FE

8D-;o

9A-2 9A-2 9A-3

9A-4

CHAPTER10 - FACTORYRETURNS

APPENDIX

Appendix A - Serial Communications Tutorial Appendix B - Configuration Worksheets

- vii -

. . .

- VIII -

Chapter 1

INTRODUCTION

1.1

GENERAL

The MetraBus system provides a low-cost means of connecting real-world I/O devices to a computer. The system is available in two configurations: (1) tightly coupled to an IBM PC bus

system or (2) remotely operated through RS-232/422 serial communications from any

computer. Under the supervision of a PC, MetraBus digital, analog, and counter-timer measurement, and

control interfaces can control cost-effective industrial I/O systems. Each MetraBus system can measure and control hundreds of analog, digital, and counter/timer I/O points. Several MetraBus systems can simultaneously control thousand of I/O points.

MetraBus fills the gap between I/O plug-in boards and dedicated industrial controllers. Plugin boards and a personal computer are finding applications in process measurement and control applications and product test stations. However, the large number of date I/O points required, the proximity of the sensors to the control room combined Gith a finite number of expansion slots available in a personal computer often require versatile systems that are flexible, provide for enhanced expansion capability and are inexpensive. The MetraBus family of industrial data acquisition products retains the close link of the personal computer to a data acquisition system while offering extreme flexibility at a price that rivals many plug-in I/O boards.

Key MetraBus features include:

1.2

Low cost I/O

Ease of programming

Simple packaging and interconnection

Reliability

100% personal computer compatible

Local, high speed interfaces

Remote capability, up to 1.2 km from computer

THE METRABUS

The MetraBus system is an extension of the computer bus to real world measurement and control devices. All MetraBus I/O boards share the 5O-conductor cable illustrated in Figure l-

1. The MetraBus cable consists of:

6 Address lines

INTRODUCTION I- 1

8 Datalines

Control/status lines

3 Power supplies

Ground conductors between all address data and control

CONTROL j WSTRB

ADDRESS x-2

BUS

! i

CLEAR

R/W

K-4

BUSY

+15 v

15 v

+5 ‘d

POWER

+-5 v t5 v +5 v 15 v

1 3 5 7 9 10

11 13 14 15 16 17

13 20 21 22 23 25 26 27 29 30 3: 33 34 35 36 37 38 39 41 43 45 47 48 49 50

40 42 44 46

GND.

GND. GND.

6 8

GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND.

+5 v

+5 v i5 v

-i5 v

POWE?

l-2

Figure 1-l. The MetmBus Connector

Six address lines yield 26 = 64 individual addresses on the MetraBus. Each MetraBus address may control any one of the following:

* 8

Digital I/O points * One 8-bit A/D point * One half of a la-bit A/D * One 8-bit D/A

One 8-bit counter/timer

METRASUS USER MANUAL

1.3 AVAILABLE METRABUS BOARDS

MetraBus I/O boards are controlled by the PC through one of the MetraBus controller/driver cards. These I/O Boards are as follows:

pCMDB-64: PS/2 compatible MetraBus controller board

MDB-64: IBM PC compatible MetraBus controller board

MID-64: IBM PC compatible controller card with full optical isolation between PC and MetraBus.

REM-64: Remote MetraBus controller. Communication via RS-232/422 serial. Multidrop up 16 REM-64 per computer serial port.

INTMDB-64: Intelligent MetraBus controller board. This board is described in a separate manual.

Both local and remote MetraBus systems control the same family of signal acquisition and control boards. The boards and their various functions are as follows:

MID-16/M%-%: 16 solid-state relays

. MEM-8: 8 electromechanical relays

MEM-32: 32 electromechanical relays

MIO-32: 32-channel, optically isolated TTL output

MII-32: 32-channe1, optically isolated TT’L input

MAI-16: Wchannel, 12-bit A/D

MAO-8: &channel, 8-bit D/A

MAO-12: 12-Channel, 12-bit A/D

MCN-8: 8 Channel, &bit counter timer

MJ3B32: 32-bit prototype board with four fully decoded addresses

MDG-1: Diagnostic/training board with LEDs

MBUS-PWR: MetraBus power supply

MSSR-32:

MCPT-8X8: Cross-point relay board

MTHERM-20: 20-channel thermocouple

MTAP-1: Power supply tap board

32-channel,

solid-state reIay board

1.4 PACKAGING & INTERCONNECTION

All MetraBus I/O boards are 19” rack mountable using either the RMT-02 housing, a standard NEMA cabinet, or any 7” x 6”~ 2” enclosure. A 50-way, 0.05” spacing ribbon cable connects the MetraBus controller/driver card to the I/O boards. This MetraBus cable operates at lengths

of up to 100’. Connectors are standard, 50-pin insulation-displacement type; their parallel

architecture allows placement at any point along the MetraBus cable.

INTRODUCTION 1 -3

1.5 CONCEPTUAL VIEW OF METRABUS

MetraBus is an extension of the PC I/O control address space. The MetraBus controller card implements three control functions, as follows:

* An address Ppinter

A data input/output path

A reset/clear line

An I/O OUT command from the PC sets the address pointer to a MetraBus I/O board at its address. Data may then move to or from the selected I/O boards. A RESET/CLEAR may come from the PC at any time, clearing all I/O boards and resetting the address pointer to zero.

1.6 PROGRAMMING METRABUS

MetraBus is programmable from any PC-usable language having INPUT and OUTPUT commands capable of manipulating the I/O bus. Examples of such languages are:

l c

BASICA

Microsoft PASCAL

Assembly

GWBASIC

TURBO PASCAL

In addition, the REM-64 MetraBus controller allows connection of a MetraBus’system to any computer with an Rs-232/RS-422 interface. A REM-64 can be controlled from any language capable of writing and reading the computer’s serial ports.

Programming the MetraBus is a two-step procedure: (1) set the address pointer then (2) read or write the data. The following discussion wiIl use the variables DATAIO, ADRPTR, and MRESET in order to help clarify MetraBus progr amming technique. These variables are generally set at the beginning of your programs for ease of manipulation as follows:

lODATA = 768 20ADRPTR = 769 30MRESET = 770

4OOU-T ADRJ?TR, 01

‘Declare MetraBus data I/O path 'Declare address pointer location 'MetraBus reset location 'Set the address pointer to address #l

5OOUT DATAIO,45 'Write data 45 to address 1

Set the MetraBus address pointer by issuing a single comman d to the MetraBus controller board. Once set, the address pointer is latched and need not be reset until a different address

is required.

l-4

Writing and reading data from a MetraBus I/O board is transparent once the address pointer

is set. Issuing an OUT command will write data to the targeted I/O board. Likewise, issuing an INP command will retrieve data from the I/O board via the data I/O path.

OTJT ADRPTR,Ol 'Set address to 1

40 500UT DATAIO,45 'Write data 45 to address 1 6OVAL

= INP(DATAI0) 'Read back data from 1

The MetraBus controller board and all attached MetraBus I/O boards may be reset by writing to the reset address. Here is an example in BASIC:

METRABUS USER MANUAL

40 OUT

MRESET, 00 ‘Clear the MetraBus

Examples of all MetraBus programming features are available on the MetraBus diskettes.

MDB-64 vs. REM-64 Programming

Direct bus plug-in controller boards (MDB-64 and MID-64) program differently than the REM-64 MetraBus serial controller board. Commands to the MDB-64 and MID-64 are direct statements to an I/O port. For example, in BASIC:

40 OUT ADRPTR, 01 5OOUT DATAIO, 44

REM-64 co

mmands are writes to a COMl or COM2 serial port. The REM-64 has an on-board

m&!roprccessor which interprets

‘Set address pointer to #l ‘Write data 44 to board #l

mmands from the personal computir. The REM-64 issues commands to the I/O boards (via the MetraBus cable) identical to those issued by an MDB-64 or MID-64. For example, in BASIC:

10 PRINT #l,"B" ; 1 'Activate REM-64 #l

PRINT #1, "A" ; 4

PRINT #l, "W" ; 44 ‘Write data “44” to I/O board #l

'Set address pointer to MetraBus address 4

Since the MDB-64 and REM-64 use different hardware connections, programs for the MDB-64

are not compatible with those for the REM-64.

Programming l/O Boards

MetraBus I/O boards fall into three major categories:

Digital in and out

Analog in and out

Counter/timer

Digital MetraBus I/O boards program with byte wide (8 bits) write and read commands. Driving a single digital line high or reading the status of a single line requires one bit. Therefore, 8 lines (or bits) are controlled when writing to or reading from the digital I/O boards.

Data to a MetraBus digital ouQut board is latchtid and may be read back from the board. This data readable feature is usable when manipulating the I/O lines, thus making digita programming easy.

Analog output boards are controlled as an g-byte port, one byte per channel. The analog equivalent of the &bit data is output by the DAC on the MetraBus analog output board.

Analog input for the MetraBus is full-featured, allowing user control of application specific parameters. Prior to reading A/D data from a MetraBus MAI-16, the range channel and type (12-bit or 8-bit) must be set. An A/D conversion is triggered by software only.

INTRODUCTION

I- 5

The MCN-8 counter/ timer board has two functions available from software: clear counter and read counter. Writing to a counter will clear it while reading a counter will retrieve the current count in the register.

SUMMARY

The remainder of this manual covers the individual MetraBus controller boards and I/O function boards. The electrical interfacing and programming aspects of each board are explained.

All explanations and example programs are as if the I/O board is under the control of an MDB-64. The MIX-64 is a complete and simple implementation of the MetraBus concept. The MID-64 and REM-64 embody additional features, and are treated in this manual with

programming examples for each. The lNTMDI3-64 is an intelligent stand-alone driver/controller board for the MetraBus, It is

usable as a dedicated, low-cost controller, or as a satellite controller monitored/controkd by a larger host computer. This board is described in the INTMDB-64 user’s manual.

Schematics for the MetraBus are available in the MetraBus schematic package.

I-6 METRAHJS USER MANUAL

Chapter 2: The Controller Boards

2A.l GENERAL

The MDB-64 driver board is the functional heart of the MetraBus system. This board supervises all I/O operations between the computer and MetraBus I/O boards within your

system. Since the MBD-64 generates all necessary control signals, it controls system-level data

transfer. Because of its design, a single MDB-64 is capable of addressing up to 64 MetraBus I/O boards. Figure 2A-1 is a functional block diagram of the MDB-64.

I I I

COMPUTER

EXPANSION

BUS

L-------------------------_--_-______---------------,

MDB-64 DRIVER BOARD

MFI’RABUS

ADDRESS

DECODE - AND

LOGIC

BASE

AOORESS

SWITCH

TIMING

CONTROL - DRIVER/ -

SIGNAL

LOGIC

METRABUS

CABLE

RECEIVER I

Part 2A

I I

I I I

I I

METRABUS

CABLE

The MDB-64 is a ‘half-slot” board that installs in any PC expansion slot. A 50-pin connector extends through the rear of the computer and connects to the MetraBus cable. Functionally, MetraBus has a parallel-bus architecture with the MetraBus cable carrying all data, address, and control signals, as well as distributing power to the MetraBus I/O boards. Ground conductors are interleaved between all signal lines to reduce system noise. The MDB-64 allows MetraBus cable lengths of up to 100 feet.

The MetraBus industrial data acquisition and control interface allows higher speed, greater accuracy, and total autonomous operation to otherwise slow and troublesome applications.

A.2 FEATURES

Interfaces with IBM PC/XT, PC AT or other bus-compatible computers.

Allows placement of MetraBus I/O boards at up to 100 feet from the computer.

Compatible with many off-the-shelf software packages.

Controls up to 512 digital I/O lines.

Controls up to 256 (8 or U.-bit) A/D.

Figure 2A-1. MDB-64 Functional Block Diagram

Controls up to 64 @-bit) DACs.

THE CONTROLLER BOARDS

MDB-64 DRIVER BOARD 2A-1

Extremely cost effective.

Adapts to your changing requirements.

2A.3 SPECIFICATIONS

Number of addressable MetraBus 64

ports:

Maximum MetraBus data transfer 80 kbytes/s

rate:

Maximum drivable cable length: 100 feet at full speed

200 feet at reduced speed

MetraBus cable type:

MetraBus connector:

Power required:

50 conductor ribbon cable 3M 3425-4050

-+ 5

V: 250 rr~4

typical, 325 n-4 maximum

2A.4 SE’TJING THE BASE ADDRESS SWITCH

The MD13-64 uses four consecutive locations in the PC I/O address space. This address space extends from decimal 512 to 1023. for 768 (3OOh), as shown in Figure 2A-2.

-2

The MDB-64 base address switch is preset by the factory

ADDRESS

ADDRESS UNE VALUES:

LINE DECIWL HEX

512

200

256 100

Figure ZA-2. Defautt Base Address Switch SettiRgs.

If I/O address 768 (300h) is occupied by another device, you must reset the base address

switch. Refer to your PC manual for available addresses in the I/O space. Once you have selected an address, change the base address switch accordingly. For

assistance with the settings, use the INSTALLEXE program provided on your MetraBus diskette.

NOTE: Setting the base address to a location used by another device may cause erratic operation or PC system failure.

To run the INSTALLEXE program, change to the appropriate directory and at the DOS prompt, and type

INSTALL

2A-2 METRABUS USER MANUAL

Switch settings indicate o voluc o!

512 i 256 = 768 Dccimoi

(768 decimal, 300h)

followed by [Enter]. When the program asks for the desired

base address, enter the new base address in decimal and press [Enter]. The program rounds your address to the nearest 4-bit boundary and checks for conflicts with other devices. Choosing an address less than 512 or greater than 1023 results in an error message. When the program determines an address is suitable, it displays the settings you must make on the Base

Address Switch. INSTALL.EXE performs an additional function: it generates a file named MBUS.ADR

containing the newly selected Base Address Switch settings. The address in the file MBUS.ADR may then be read by application programs as an alternative to m-defining the MDB-64 address in every program. The following short BASIC program shows how to obtain the address from the MBUSADR file.

lOOPEN "KBUS.ADR" FOR INPUT AS #l

INPUT #~,BASADR

30 PRINT BASADR

CLOSE #l

The base address location is returned to the variable BASADR for use by your application program.

2A.5 INSTALLING THE MDB-64 FUSE.(Fl)

MBD-64 fuse Fl allows the PC to supply +5 VDC to the MetraBus I/O boards via the MetraBus cable. Large systems and those using +15 V will require an additional high-quality power supply such as the MBUS-PWR (see Contents). Failure to remove the fuse when using the MDB-44 with an external power supply causes the fuse to blow.

If the MetraBus System is to draw power from the PC power supply, the fuse Fl must be installed. This fuse is a Littlefuse #312001,3AG 2A fast blow.

In this case, Fuse Fl must be removed.

2A.6 INSTALLING THE MDB-64 DRIVER CARD

1. Unplug your computer. Remove the cover of your computer and select any empty expansion slot. Remove the

2. backplate from the selected slot. If you are using an IBM PC/XT, note that the MDB-64 does

not

operate correctly in the short expansion slot farthest to the right (I8) next to the power supply. This slot is reserved for the IBM expander card and is not available for peripherals since the bus signals are slightly different from the other slots.

Make certain that the base address switch is properly set and fuse Fl is installed/removed

3. (as needed).

Lnsert the MDB-64 into a PC expansion slot. If needed, straighten the locking tabs on the

4. ends of the connector prior to insertion.

Once the board is in place, plug the MeiraBus cable into the MDB-64. Make sure the

5. locking tabs are locked around the mating portions of the MetraBus connector. The mating portions of the connectors are keyed and should plug-in easily. Check the keyways for correct alignment prior to insertion, Avoid applying force to the connector.

Secure the MDB-64 backplate to the computer frame with a screw and replace the

6. computer cover.

THE CONTROLLER BOARDS

MDB-64 DRIVER BOARD 2A-3

NOTE: The MDB-64 is shipped with two resistor networks. These termination resistors are to be installed in sockets RN1 and RN2 on the last MetraBus I/O board in your system. These resistor networks are used to minimize signal reflection due to long MetraBus cable lengths. They are optional, however, and have little effect for cables of 50 feet or less.

2A.7 THE MDB-64 METRABUS CONNECTOR

The MDB-64 passes information to and receives data from the MetraBus I/O boards via the MetraBus cable. Figure ZA-3 shows the physical and functional layout of this cable.

NOTE: The +15 VDC pins are active only when the MDB-64 is used

in conjunction with an external power supply such as the MBUS-PWR.

DATA BUS

POWER

BUSY

+15 v

-15 v +5 v +5 v +5 v +5 v

L t5v

3 5 6 7

9 10 1 1 13 15 16 17 19 20

21 22 23 24 25 26 27 28 29 31 33 35 36 37 39 40 41 43

45 46 47 48 49 50

12 14

30 32 34

42 44

GND.

2 4

GND. GND. GND.

GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND.

GND. GND. GND. GND. +5 v i-5 v +5 v

-1-5 v i-5 v

POWER

2A-4

Figure ZA-3. MetraBus Connector Pinouts

METRABUS USER MANUAL

2A.8 PROGRAMMING THE MDB-64

As mentioned earlier, the PC has I/O address locations for such things as disk drives,

printers, serial ports, and other peripherals. The MDB-64 Base Address is located within this

I/O space. The three MDB-64 locations and their functions are as follows:

LOCATION I/O ADDRESS

(Decimal)

Base Address +-Oh Base Address +lh Base Address +2h Base Address +3 h

768 Data I/O path (DATAIO) 769

‘770 Software reset (PRESET)

771 Unassigne4l

Address pointer (ADRPTR)

Function

For the sake of clarity, all references to specific address locations use the variable names DATAIO, ADRFTR, and MRESET as specified in the table above. Normally, variable assignments are made at the beginning of your application program. For example,

ZODATAEO = 768 'Declare data I/O location 20ADRPTR = 769 'Declare addxess pointer location 30WSET = 770 'Declare RESET location

The following sections discuss address location use. All references to the above locations assume a base address of 768 decimal

The Address Pointer

(ADRPTR)

functions

in order of typical programming

(300h).

The function of the MDB-64 address pointer is to point to the specific MetraBus I/O board to be accessed. Each MetraBus I/O Board must

in order to identify it from other boards in the MeiraBus system.

have

a unique, non-overlapping board address

(Refer to the section “Setting the board address” for the relevant I/O board.) Writing the board address to ADFUYIR sets the current MetraBus address and targets the specific I/O board for use. Once the address pointer is set to a particular board address, data can be written to or read from that board. The BASIC commands IN? and OUT control the read and write functions respectively. It should be noted that while the example are

written

using BASIC, many computer languages supporting data I/O operations may be used. Refer to the programming manual for the language that you are using for the correct syntax. The following example illustrates how to

set the address pointer to a MetraBus I/O board (MEM-8) at address 12. 10ADRPTR = 769

2QDATAIO = 76% 30MRELSET = 770 4OMBf8 = 12

5OOUT ADRPTR, MEM8 'Point to HEM-8 at address 12

Once the MetraBus address pointer is set, it does not change until another OUT command changes it. Setting the address pointer is a fast operation on the personal computer bus, taking less than 10 p.

Remember

that

the address pointer is used to point to a MetraBus I/O board address. Since this address is latched on the MDB-64, it can be read back using the BASIC INP command, as follows:

60ADDREXS = INP(ADRPTR)

THE CONTROLLER BOARDS

'Declare address pointer location 'Declare data I/O location 'Declare HetraBus RESET location ‘Declare m-8 board address

MDB-64 DRIVER BOARD

ZA-5

The BASIC variable ADDRESS contains the current MetraBus I/O board address. If the above INP command were issued immediately after the previous OUT command, the ADDRESS variable would contain a valued of 12. Reading the address pointer returns six bits of address information and two bits of status information (R/W and BUSY), as shown below:

Address Byte

BIT D7

D4 D3 D2

BUSY R/w A.5

Al A0

NOTE: The driver board inverts the polarity of the actual bus control

signals.

Normally, the BUSY and R/W status bits are low (non-zero). When this is true, the data returned is identical to the contents of the address pointer. See Programming The MDB-64 7’0 Covttiol The I/O Boar& for an example and an explanation of how to monitor the status bits.

The Data l/O Register (DATAIO)

Once the address pointer has been set, data may be written to and read from a MetraBus I/O board. All data transfer takes place through DATAIO. Accessing specific functions on the MetraBus I/O board and passing data back to the computer via DATA10 may be accomplished using the BASIC OUT command

70 OUT DATAIO, 128

This command calls for a value of 128 which might activate a relay on the MEM-8 relay board. The actual functions that it specifies is dependent on the board accessed.

You may read data from the data I/O with a single IN7 command, as follows:

EODAT = INP(DATAI0)

The BASIC variable DAT

contains

the ADRPTR. All MetraBus output boards latch data sent to them and therefore, have data readable capability. This means that if the above IN? command were issued after the previous OUT command, variable DAT would contain a value of 128.

The Sofiware RESET (MRESET)

A software reset causes alI MetraBus I/O boards connected to the MetraBus cable to be reset to a known state. See the description of the I/O board for more details. The following shows how to use the software RESET feature for all MetraBus I/O boards.

80 OUT HRZSET, 00 90 START = TIMER 100 IF (TIZGR - START) < .02 THEN 100

The BASIC Timer command is used to insure a wait of 20 ms for the reset pulse to finish.

214-6 METRABUS USER MANUAL

data from the MetraBus I/O board previously targeted by

Notes On The Use Of Compiled Or Assembled Languages

Execution speeds with compiled and assembled languages may call for precautions. As mentioned earlier, when reading the currently latched MetraBus I/O address, the lowest six bits contain address information while the two most significant bits carry status information.

Prior to any BASIC Inp or Out command, check the status bits (R/W and Busy). The

following example shows the proper status checks.

DATA10 = 768

ADRPTR = 769

MRESET = 770

MA116 = 8

OUT MRESET, 00

50 60 START = TIMR

IF (TIKER - START) <

IF (INPUDRPTR) AND 192)

80 90 OUT ADRPTR, HAI16+2

IF (INP(ADFU?TR) AND 192)

100

OUT DATAIO, 18

110

IF (INP(ADRPTR) AND 192)

120 130 OUT ADRPTR, HAI16+1 140 IF (INP(ADRPTR) AND 192) THEN 140 150 AIN = INP(DATAI0)

.02 THEN 70

THEN 80 THEN 100 THEN 120

'Declare I/O location 'Declare address pointer location 'Declafe MetraBus RESET location 'Declare MAI- board address

'Input Time 'Wait 20 ms 'Check status 'Point to 'Check status 'Set gain to +5 V range on than 2 'Check status 'Point to result of conversion 'Check status 'Return result to computer

g-bit

A/D resolution

Programming The MDB-64 To Control The l/O Boards

As described above, the three MDB-64 I/O locations have quite distinct of execution generally follows a consistent pattern when programming any MetraBus I/O

board. The following examples illustrate programming techniques used with both digital and

analog

I/O Boards. For prograrnmin

g information on a specific board, refer to the board

description.

Digital l/O Boards

functions.

Their order

Digital I/O boards are the easiest to control. Data can be written to DATAIO setting the address pointer. Digital output boards typically have several &bit ports. In the following example, a digital output board (MIO-32) is at board address 0 and the MDB-64 is at computer I/O Address 768 decimal (3OOh).

lODATA = 768 20ADRPTR = 769 3OMRESET = 770 40MI032 = 0 'Declare MIO-32 board address

5OOUT

ADRPTR, MI032

6OOUT DATAIO, 255

Lines 10 through 40 declare the locations of the MetraBus DATAIO, ADRF’TR, and MRESET functions, as well as declare the MIO-32 board address. Line 50 sets the address pointer to the MIO-32 digital output board. Line 60 outputs a value of 255 to the MIO-32, setting all outputs high.

THE CONTROLLER BOARDS

'Declare data

'Declare

address pointer location

I/O

location

'Declare MetraBus REXXT location

'Point to MIO-32

address 0

'Output bit pattern 1111 1111

MDB-64 DRIVER BOARD

soon

after

the

2A-7

Digital input board (Mu-32) programmin

g is similar to that for digital output boards. Digital input boards typically have several B-bit ports. After the address pointer has been set, data can be read from the DATAIO, as follows:

lODATA = 768 'Declare Data I/O Location 20ADRPTR = 769 'Declare Address Pointer Location 30MRBSET = 770 'Declare MetraBus RESET Location 40MII32 = 4 'Declare MII-32 Board Address 5OOUT ADRPTR, MI132 'Point to MII-32 at Address 4 60DATIN = INP(DATAI0) 'Get data from DATA10

Lines 10 through 40 declare the locations of the MetraBus DATAIO, ADKPTR, and

the

MRESET functions, as well as declare the MU-32 board address. Line 50 sets the address pointer to the MIl-32 digital input board. Line 60 reads the contents of one of the four &bit ports on the m-32 and stores the result in the BASIC variable DATIN.

Analog I/O Boards

Analog output boards (MAO-8) use one MetraBus I/O address per channel. Setting the Address Pointer to the appropriate address and writing data to the DATAIO will produce an analog output. The following example shows how to set the address pointer and output a voltage.

lODATA = 768 20ADRPTR = 769 30MRESET = 770 4OMAO8 = 8 5OOUT ADRPTR, MAO8 6OOUT DATAIO, 255 7OOUT DATAIO, 0 8OOUT ADRPTR, MA116

Lines 10 through 40 declare the locations of the MetiaBus DATAIO, ADRPTR, and the MRXSET functions, as well as declare the MAO-8 board address. Line 50 sets the address pointer to channel 0 of the MAO-8 board. Line 60 outputs the highest voltage possible for its selected range.

'Declare Data I/O Location 'Declare Address Pointer Location 'Declare MetraBus RESET Location 'Declare MAO-8 Board Address 'Point to HAO-8 at Address 8 'Output Pull Range Voltage 'Start A/D Conversion 'Select the MSB's address

Analog Input boards (MAI-16) require additional steps, however, in order to set the gain and resolution for the desired channel prior to taking data. Assume an MAI- board has been set at Board Address 8.

lODATA = 768 'Declare Data I/O Location 20ADRPTR = 769 'Declare Address Pointer Location 30MRESET = 770 35MAI16 = 8

4OOUT ADRPTR, KAI16+2'Point to 8-bit A/D resolution

SOOUT DATIO,18 'Set gain to + 5 V 6OCUT ADRPTR, MAI16+1'Point to result of conversion 90AIN = INP(DATAI0) 'Return result to computer

Lines 10 through 35 declare the locations of the MetraBus DATAIO, ADRPTR, and the MXESET functions, as well as declare the MN-16 board address.

Line 40 selects the gain/channel selection mode for the board at address 8 (see MN-16 description for full explanation).

2A-a METRABUS USER MANUAL

'Declare MetraBus RESET Location 'Declare MAI- Board Address

range

on channel 2

Line 50 sets the gain to + 5V full scale range on channel 2.

Line 60 points to the B-bit conversion mode for the board and channel previously selected. Line 70 starts the A/D conversion process. Line 80 points to the results of the A/D conversion. Line 90 returns the result to the computer and stores the data in the variable AJN.

THE CONTROLLER BOARDS

MDB-64 DRIVER BOARD 2A-9

2A-10 METRABUS USER MANUAL

Chapter 2: The Controller Boards

2B.l GENERAL

Part 2B

MID-64 DRIVER BOARD

The MID-64 driver board optically isolates the computer bus from acquisition and control computer and MetraBus I/O boards within your

system.

The MID-64 supervises all I/O operations between the

system.

All necessary control signals are

the

MetraBus data

generated within the MID-64, so you don’t have to worry about system level data transfer. Because of its design, a single MID-64 is capable of addressing up to 64 MetraBus I/O boards. The MID-64 contains an on-board, programmable counter/timer capable of periodic

system

interrupt generation. This allows the MetraBus operation in a foreground/background mode emulating many common multitasking environments. A functional block diagram of the MlD-64 is provided in Figure 2B-1.

r--------------------------------------------------------------------~

METfZABUS

COMPUTER :

EXPANSION -

BUS

I BUS -

ADDRESS OECOOE -

LOGIC

BASE

ADDRESS

WITCH

TIMING MEmABuS !

AND

CONTROL - ISOLAlORS DRIER/ ?-+ CABLE

SIGNAL RECEIVER 1 LOGIC

CABLE ’ Mmus

Figure 2B-1. MID-64 Functional Block Diagram

When installed, a 50-pin connector extends out the rear of the computer and connects to the

MetraBus cable. Functionally, the MetraBus has a parallel bus architecture with the MetraBus cable carrying all data, address, and control signals, as well as distributing power to the MetraBus I/O boards. Ground conductors are interleaved between all signal lines to increase system noise immunity. The MID-64 has been designed to allow MetraBus cable lengths of up to loo feet.

The MetraBus industrial data acquisition and control interface, in conjunction with your present computer, allows higher speed, greater accuracy, and total autonomous operation to previously slow, troublesome, applications.

THE CONTROLLER BOARDS

MID-64 DRIVER BOARD

2B-1

2B.2 FEATURES

Connects with IBM PC/XT, PC AT, or other bus compatible computers.

Allows placement of MetraBus I/O at up to 100 feet from the PC.

Full optical isolation to 500 Volts.

Fully compatible with software written for the MDB-64 driver board.

Interrupt generation capability.

Controls up to 512 digital I/O lines.

Controls up to 256 (8 or 12-bit) A/D.

Controls of 64 @-bit) DACs.

Controls up to 64 counter/timers.

Extremely cost effective.

Adapts to your changing requirements.

28.3 SPECIFICATIONS

Number of Addressable MetraBus

Ports:

2B.4

Maximum MetraBus Data TrmR;yz

80 kbytes/s

Maximum Drivable Cable Length: 100 feet at full speed

200 feet at reduced speed

+ 5

Power Required:

PC to MetraBus Isolation:

V: 250 mA typical, 325 rnA maximum

500 volts (minimum)

SETTING THE BASE ADDRESS SWITCH

The MID-64 uses four consecutive locations in the PC I/O address space. This address space

extends from decimal 512 to 1023. The MID-64 Base Address Switch is preset by the factory for 768 (3OOh), as shown in Figure 2A-2.

ADDRESS

LINE

qs iedicote 0 value o!

i 256 = 766 Decimal

+ iOD = 300 Hex

Figure 2B-2. Default Base Address Switch Settings.

2B-2 METRABUS USER MANUAL

(768 decimal, 300h)

If I/O address 768 (300h) is occupied by another device, you must reset the base address switch. Refer to your PC manual for available addresses in the I/O space.

Once you have selected an address, change the base address switch accordingly. For assistance with the settings, use the INSTALLEXE program provided on your MetraBus

diskette.

NOTE: may cause erratic operation or PC system failure.

To run the INSTALL.EXE program, change to the appropriate directory and at the DOS

prompt, and type INSTALL followed by [Enter]. When the program asks for the desired

base address, enter the new base address in decimal and press [Enter]. The program will

round your address to the nearest 4-bit boundary and check for conflicts with other devices. Choosing an address less than 512 or greater than 1023 results in an error message. When the program determines an address is suitable, it displays the settings you must make on the base

address switch.

INSTALL.EXE also generates a file named MBUSADR containing the newly selected base address switch settings. The address in the file &!fHJS.ADR may then be read by application programs as an alternative to redefining the MID-64 address in every program. The following short BASIC program shows how to obtain the address from the MBUS.ADR file.

1OOPKN "MBUS.ADR" FOR INPUT AS #1

20 INPUT #l,BASADR

30PRINT BASADR

CLOSE #l

The base address location is returned to the variable BASADR for use by your application program.

Setting the base Aadress to a location used by another device

2B.5 USE OF THE AUXILIARY POWER SUPPLY

An auxiliary power supply such as the MBUS-Pm is required for operation of the MID-64, since it does not distribute power from the computer’s supply. See the chapters of this manual dealing with the MBUS-PWR for specifications and installation instructions.

2B.6 INSTALLING THE MID-64 DRIVER CARD

1. Unplug your computer.

2. Remove the cover of your computer and select any empty expansion slot. Remove the back-plate from the selected slot.

3. Make certain that the base address switch is properly set.

4. Insert the MID-64 into the expansion slot. It may help to straighten the locking tabs on the ends of the connector prior to insertion.

THE CONTROLLER BOARDS MID-64 DRIVER BOARD 28-3

5. Once the board has been inserted, plug the MetraBus cable into the MID-64. Make sure that the locking tabs are locked around the mating portions of the MetraBus connector.

The mating portions of the connectors are keyed and should plug-in easily.

Check the

keyways for correct alignment prior to insertion. Avoid applying force to the connector.

6. Secure the MID-64 back-plate to the computer frame with a screw and replace the computer cover.

NOTE:

The MID-64 is shipped with two resistor nehvorks. termination resistors are to be installed in sockets RN1 and RN2 on the last MetraBus I/O board in your system. These resistor networks are used to minimize signal reflection due to long MetraBus cable lengths. They are optional, however, and have little effect for cables of 50 feet or less.

2B.7 THE MID-64 METRABUS CONNECTOR

The MID-64 passes information to and receives data from the MetraBus I/O boards via the MetraBus cable. Figure 2B-3 shows the physical and functional layout of this cable.

The

+15

NOTE: conjunction with an external power supply such as the MBUS-PWR.

DATA m BUS

CONTROL

ADDRESS /

BUS

POWER +5 v

VDC pins are active only when the MID-64 is used in

D-1

m iz

tie

CLEAR

WSTRB

-iii

A2 23

BUSY

+I5 v

-15 v i5 v

+.5 v +5 v +5 v

1 3 5 7 9 IO

1 1 13 14 15 17

19 2 1 22 23 25 26 27 28 29 30 31 33 34 35 37 39 40 4’1 43 44 45 47 49

16 18 20

46 48 50

2 4 6

GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND.

GND. GND. GND. GND.

GND.

GND. GN3. GN3. GND. +5 v +5 v +5 v +5 v +5 v

These

POWER

28-4

Figure 28-3. The MetraBus Connector

METRABUS USER MANUAL

2B.8 PROGRAMMING THE MID-64

As mentioned earlier, the PC has I/O address locations for such things as disk drives,

printers, serial ports, and other peripherals. The MID-64 base address is located within this

I/O space. The eight MID-64 locations and their associated functions are as follows:

LOCATION

I/O ADDRESS

(DecimaI)

Base Address +Oh Base Address +lh Base Address

+2h

Base Address +3h Base -4~Uress 4h

Base Address +5h Base Address +6h Base Address +7h

768 769 770 771 772 773 774 775

NOTE: Most applications do not require counter/timer interrupt implementation.

For those that do, a short section is included in this manual. The discussion below will deal with the majority of applications and wiIl, for the moment, ignore interrupt implementation.

There are three important address locations:

Address pointer (ADRF’TR)

Data I/O path (DATAIO) Software reset (MRESET)

Function

Data I/O pPath (DATAIO)

Address pPointer (ADRXR)

Software rReset (MRESET)

Unassigned

counter 0 (COUNTO)

Counter 1 (COTJNTI)

Unassigned

Counter cContro1 (CNTCTRL)

The following sections discuss address location functionality in order of typical programming use. All references to the above locations will assume a base address of decimal 768. For the sake of clarity, all references to specific address locations will use the variable names DATAIO, ADRPTR, and MRESET as specified in the table above. Normally, variable

assignments are made at the beginning of your application program, as follows: 1ODATAIO = 768 'Declare Data I/O Location

20ADRPTR = 769 ‘Declare Address Pointer Location

30MRESET = 770

The Address Pointer (ADRPTR)

The function of the MID-64 address pointer is to point to the specific MetraBus I/O board to be accessed. Each MetraBus I/O board must have a unique, non-overlapping board address in order to identify it from other boards in the MetraBus system. (Refer to the section “Setting

the Board Address” for the relevant I/O board.) Writing the Board Address to ADRPTR sets the current MetraBus address and targets the specific I/O board for use. Once the address pointer is set to a particular board address, data can be written to or read from that board. The BASIC commands INP and OUT control the read and write functions respectively. It should be noted that while the examples are written using BASIC, many computer languages supporting data I/O operations may be used. Refer to the programming manual for the

THE CONTROLLER BOARDS

‘Declare RELSET Location

MID-64 DRIVER BOARD

28-5

language that you are using for the correct syntax. The following example illustrates how to set ADRF’TR to address 12 for a MEM-8 board:

10 ADRPTR = 769 20DATAI0 = 768

30MRESET = 770

40MEMB = 22 ‘Declare MEN-8 board address

OUT ADRPTR, KEN8

'Declare address pointer location 'Declare data I/O location 'Declare MetraBus RESET location

'Point to MELM-8 at address 12

Once the MetraBus address pointer is set, it does not change until another OUT command changes it.

Setting the Address pointer is a fast operation on the personal computer bus,

taking less than 10 microseconds. Since this address is latched on the MID-&, it can be read

back using the BASIC INF’ command, for example:

ADDRESS = INPCADRPTR)

The BASIC variable ADDRESS contains the address of the MetraBus I/O board currently

targeted. If the above INP co

mmand is issued soon after the previous OUT command, the

ADDRESS variable would contain a value of 12. Reading the address pointer returns 6 bits of

address information and two bits of status information (R/W and BUSY), as follows:

Address Byte

BIT D7 D6 D5 D4

BUSY Pu’W A5

D3 D2 Dl

A2 Al A0

NOTE: The driver board inverts the polarity of the actual

signals.

bus control

Normally, the BUSY and R/W status bits will be low (non-zero>. When this is true, the data returned is identical to the contents of the address bus. See Programming The MID-64 To

Control The I/O Boards for an example and an expknation of how to monitor the status bits.

The Data I/O Register (DATA/O)

Once the address pointer has been set, data may be written to and read from a targeted

MetraBus I/O board. All data transfer takes place through DATAIO. Accessing specific functions on the MetraBus I/O board and passing data back to the computer via DATA10 may be accomplished using the BASIC OUT command:

7OOUT DATAIO, 128

This command outputs a value of 128 which might activate a relay on the The actual functions that it specifies is dependent on the board accessed.

Data

can be read from the

80DAT

= INP (DATAIO)

Data I/O with a single lNP con-man

d, as follows:

The BASIC variable DAT wiIl contain data from the MetraBus I/O board previously targeted by the ADRM’R. All MetraBus output boards latch data sent to them and therefore, have data

MEM-8

relay

board.

2B-6 METRABUS USER MANUAL

readback capability. This means that if the above INP command were issued after the previous OUT command, variable DAT would contain a value of 128.

The Software RESET (MRESET)

A software reset causes all MetraBus I/O boards connected to the MetraBus cable to be reset

to a known state. See the description of the I/O board for more details. The following shows

how to use the software RESET feature for al1 MetraBus I/O boards.

OUT MRESET, 00

80 90 START = TIMER

IF (TIMF,R - START) < .3 THEN 100

100

The BASIC Timer command is used to insure a wait of 300 ms for the reset pulse to finish.

Notes On The Use Of Compiled Or Assembled Languages

The execution speed of compiled and assembledIanguages calls for precautions. As mentioned earlier, when reading the currently latched MetraBus I/O address, the lowest six bits contain address information while the two Most Significant Bits carry status information.

Prior to any BASIC Inp or Out command, you should check the status bits (R/W and Busy).

The following example shows the proper status checks.

DATA10 = 768

ADRPTR = 769

MRESET = 770

MA116 = 8

OUT MRESET, 00

60 START = TIMER

IF (TIMER - START)

80 IF (INJ?(ADRPl'R) AND 90 OUT ADRPTR, MAI16+2 100 IF (INP(ADRPTR) AND

OUT

110 120 IF (INP(ADRmR) AND

130 OUT ADRPTR, MA116+1

140 IF (INP(ADRPTR) AND 150 AIN = INP(DATAI0)

DATAIO, 18

.3 THEN 70

192) TEEN 80 'Check status

192) TW3N 100

192) TWEN 120

192) THEN 140

'Declare I/O location 'Declare address pointer location 'Declare MetraBus RESET location 'Declare MAI- board address

'Input Time 'Wait 300 ms

'Point to B-bit A/D resolution 'Check status 'Set gain to +5 V range on than 2 'Check status 'Point to result of conversion 'Check status

.'Return result to computer

Programming The MID-64 To Control The I/O Boards

As described above, the eight MID-64 I/O locations have distinct functions. Their order of execution generally follows a consistent pattern when programming any MetraBus I/O board. The following examples illustrate programmin Analog I/O Boards. Detailed programmin g information on a specific board, refer to the board description.

Digital I/O Boards

Digital I/O boards are the easiest to control. Data can be written to DATAIO soon after

setting the Address Pointer. Digital output boards typically have several 8-bit ports. In the

following example, a digital output board (MIO-32) is at board address 0 and the MID-64 is at

computer I/O Address 768 decimal GOOh).

g techniques used with both Digital and

THE CONTROLLER BOARDS MID-64 DRIVER BOARD

28-7

IODATAIO = 768 'Declare Data I/O Location 20ADRPTR = 769 'Declare Address Pointer Location 30MRESET = 770 'Declare MetraBus RESET Location

40MI032 = 0 'Declare MIO-32 Board Address

50 OUT ADRPTR, MI032 60OUT DATAIO, 255

'Point to MIO-32 at Address 0 'Output bit pattern 1111 1111

Lines 10 through 40 declare the locations of the MetraBus DATAIO, ADRPTR, and the MRESET functions, as well as declare the MIO-32 board address. Line 50 sets the address pointer to the MIO-32 digital output board. Line 60 outputs a value of 255 to the MIO-32,

setting all outputs

high.

Digiti input board programming is similar to that for digital output boards. Digital input boards (MII-32) typically have several &bit ports. After the address pointer has been set, data can be read from the DATAIO, for example:

1ODATAIO = 768 20ADRPTR = 769 30HRESET = 770

4OMII32 = 4

5OOUT ADRPTR, MI132

'Declare Data I/O Location 'Declare Address Pointer Location 'Declare MetraBus RESET Location 'Declare MII-32 Board Address 'Point to MII-32 at Address 4

60 DATIN = INP(DATAI0) 'Get data from DATAIO

Lines 10 through 40 declare the locations of the MetraBus DATAIO, ADRPTR, and the MFZSET dictions, as well as declare the MI-32 board address. Line 50 sets the address pointer to the MII-32 digital input board. Line 60 reads the contents of one of the four &bit ports on the m-32 and stores the result in the BASIC variable DATIN.

Analog l/O Boards

Analog output boards (MAO-8) use one MetraBus I/O address per channel. Setting the address pointer to the appropriate address and writing data to the DATAIO will produce

analog output. The following example shows how to set the address pointer and output a

voltage.

lODATA = 768 ZOADRPTR = 769 30MRESET = 770 4OMAO8 = 8

5OOUT ADRPTR, MAO8

600UT DATAIO, 255 'Output Full Range Voltage

'Declare Data I/O Location 'Declare Address Pointer Location 'Declare MetraBus

RESET

Location 'Declare MAO-8 Board Address 'Point to MAO-8 at Address 8

28-8

Lines 10 through 40 declare the locations of the MetraBus DATAIO, ADRPTR, and the MR.ESET functions, as well as declare the MAO-8 board address. Line 50 sets the address pointer to channel 0 of the MAO-8 board. Line 60 outputs the highest voltage possible for its selected range.

Analog input boards (MAI-16) require additional steps, however, in order to set the gain and resolution for the desired channel prior to taking data. Assume an MAI- board has been set at Board Address 8.

10DATAIO = 768 'Declare Data I/O Location 20ADRPTR = 769 'Declare Address Pointer Location 30MRESET = 770 'Declare MetraBus RESET Location 35MAIl6 = 8 'Declare MAI- Board Address 4OOuT ADRPTR, MAI16+2'Point to 8-bit A/D resolution

METRABUS USER MANUAL

500UT DATI0,18 'Set gain to + 5 V range on channel 2 600UT ADRPTR, MAI16+1'Point to result 90AIN

= INP(DATAI0) 'Return result

of conversion

to computer

Lines 10 through 35 declare the locations of the MetraBus DATAIO, ADRPTR, and the

MFCESET functions, as well as declare the MAI- board address.

Line 40 selects

the

gain/channel selection mode for the board at address 8 (see MAI-

description for full explanation). Line 50 sets the gain to + 5V full scale range on channel 2. Line 60 points to the &bit conversion mode for the board and channel previously selected Line 70 starts the A/D conversion process. Line 80 points to the results of

the

A/D conversion.

Line 90 returns the result to the computer and stores the data in the variable AIN,

Interrupt Generation Via The 8254 Counter/Timers

The following discussion is for MetraBus users familiar with the 8254 and its associated registers as well as IBM PC interrupts and interrupt service routines. See the 8254 Data Sheet for further information.

For this discussion, we will simply show how to generate the interrupt. It is left to the user to actually implement interrupt functionality. There are several good books dealing with IBM PC interrupts and information, such as: Inside the IBM PC by Peter Norton and Assembler for PC-XT by Peter Abel.

how to service

them as well as vector tables and related interrupt

the

IBM PC and

The MID-64 has an INTEL 8254 programmable interval timer I.C. in conjunction with a 6 MHz

clock. The output from these counters may be connected to the PC bus. The counter can be

programmed to generate periodic interrupts for any of the IBM PC interrupt levels 2 through

7. This allows an interrupt service routine to be controlling the MetraBus in the background while the computer is doing some other function in the foreground.

Timing is accomplished as follows:

the output of counter 0 is cascaded to the input of counter 1 creating a 32-bit counter (this provides a maximum interrupt time of once every 11.9 seconds). The output from counter 1 is brought to the interrupt jumpers on the MID-&l. There are typically 6 interrupt levels number 2 through 7, (level 1 is reserved). Level 2 highest priority if more than one peripheral is requesting interrupt service at the same time. To enable an interrupt request (IRQ), simply connect the counter output to the computer bus by placing the IXQ level jumper on the desired level. Then, write the desired control word to the 8254 control register. Next, point to counter 0 and/or counter 1 via the ADRPTR and write a data word (clock multiplier) to the high and low byte registers of the 8254. This sets up the tuner. Writing to the base address +7 starts the timer.

THE CONTROLLER BOARDS MID-64 DRIVER BOARD

has the

26-9

28-10 METRABUS USER MANUAL

Chapter 2: The Controller Boards

2C.l GENERAL

The pCMDB-64 MetraBus controller board allows you to integrate your IBM PC System 2

(PS/2) computer (models 50 through 80) with a MetraBus industrial data acquisition and control system. The MetraBus system is a low-cost solution for slow, troublesome data

acquisition applications. The pCMDB-64 Board supervises all I/O operations between the PS/2 and the.MetraBus I/O

boards in your system (refer to Chapter 1 for a list of compatible boards). One pCMDB-64 board controls up to 64 external MetraBus I/O boards. The lKMDB-64 is capable of

controlling up to 512 Digital I/O lines, 256 (8 or 12 bit) A/D lines, and 64 (8 bit) D/A lines. All timing and control signals are generated from the pCMDE-64.

The lKMDB-64 is easily programmable using any of the following languages: C, BASICA, Microsoft Pascal, TURBO PASCAL, Assembly, or GWBASIC. A Utility Disk, containing

sample programs, is provided with the @vIDB-64 to aid in creating custom programs.

Part 2C

pCMDB-64 DRIVER BOARD

2C.2 SPECIFICATIONS

Physical

MetraBus Cable Type: 50-Conductor Ribbon cable.

MetraBus Connector:

Environmental

Operating Temperature: +32 to +158” F (0 to +70” C)

Storage Temperature: -104 to +212” F t-40” to +lOO” C)

Humidity: 0 to 95%, non-condensing

Size:

Weight: 18 ounces (509.40 g.)

11.50” L x 3.47’ H (29.17 cm L x 8.61 cm H)

3M 3425-6050

THE CONTROLLER BOARDS

pCMDB-64 DRIVER BOARD

2c-1

2C.3 USE OF AN AUXILIARY POWER SUPPLY

If you have more than one MCPT-8x8 or other MetraBus I/O boards installed in your MetraBus system or do not wish to use the PC +5 V power, an auxiliary power supply may be required. Refer to the MBUSPWR sections for more information.

2C.4 SYSTEM CONFIGURATION

The jKMDB-64 design is in accordance with the IBM PS/2 POS (Programmable Option Select) rules and there are no user jumpers or switches. registered with IBM. If you need a special ID number for O.E.M. applications, contact our technical support department as instructed in Instrz~tions For FLZC~~~ Rams .

If you are familiar with installing peripheral boards in your PS/2, you may want to skim over most of this section. It is important, however, that you read the section Configuring the

System . The system configuration procedure differs slightly from typical ones.

If you have never installed a peripheral board in your PS/2, you might find it helpful to have your PS/2 User’s Guide handy.

Installing The Board

The Board Identifier Number (602Bh) is

Before installing the pCMDI3-64, be sure that you have created a working diskette containing the @602b.ADF file and the contents of the IBM PS/2 Reference Disk (provided with your

computer). This section provides general instructions for installing the pCMDB-64 Board. For more detailed information regarding installation of peripheral boards, refer to the Installing options section of the IBM Personal System/2 Model XX Quick Reference provided with your computer.

WARNING

DO NOT ATTEMPT TO INSERT OR REMOVE ANY ADAPTER BOARD WITH THE COMPUTER POWER ON, OR YOU RISK

DAMAGING YOUR COMPUTER!

IBM PS/2 Model 50

install the pCMDB-64 Board,

1. Turn off power to the PS/2 and to all attached options.

2. Unplug the power cords of the PS/2 and all attached options from the electrical outlets. Note where all the cables and cords are attached to the rear of the system unit, and disconnect.

3. Make certain the cover lock is unlocked.

4. Remove the cover of the PS/2.

5. Choose an available option slot. Loosen the screw at the base of the blank adapter plate. Then slide the plate up and out to remove.

6. Hold the lKlvIDB-64 in one hand. With the other hand, touch any metaIlic part of the PS/2 cabinet. This will safely discharge any static electricity from your body.

2c-2 METRABUS USER MANUAL

7. Align the gold edge connector with the edge socket and the back adapter place with the adapter plate screw. Note that a slot in the pCMDB-64 edge connector mates with a key in

the socket, located at the front of the computer. Gently press the board downward into the socket. You may need to loosen the adapter plate screw more in order to push the board fully into the socket. Do not be concerned if ~CMDB-64 connector does not use all

sections of the socket connector. Re-tighten the adapter plane screw.

8. Replace the computer’s cover. Tilt the cover up and slide it onto the system’s base, making sure the front of the cover is under the rail along the front of the frame. Install

two mounting screws.

9. Plug in all cords and cables. Turn the power to the computer back on.

You should now be ready to configure your system.

I5MPS/2Mod&60and80

To install the pCMDB-64 Board,

1. Turn the power to the PS/2 and to all attached options OFF.

2. Unplug the power cords of the PS/2 and all attached options from the electrical outlets. Make a note of where all the cables and cords are attached to the rear of the system unit and disconnect.

the

3. Make

certain the cover lock

is unlocked.

4. Loosen the two cover screws with a coin (these screws should remain in the cover). Remove the cover.

5. Choose an available option slot. Loosen the screw on the expansion slot cover. Then,

slide the cover out and remove. Store the cover in a safe place for future use.

6. HoId the pCMDB-64 in one hand. With the other hand, touch any metallic part of the PS/2 cabinet. This will safely discharge any static electricity from your body.

7. Firmly press the JKMDP&I board into the expansion slot connector until the adapter clicks into place. Then, tighten the screw.

8. Find the square cut-outs in the bottom of the computer cabinet. Align the cover latches

with the cut-outs and install the cover. Tighten the two cover smews using a coin.

9. It is suggested that you lock the cover to help protect the devices and options inside the

computer.

10. Connect all cables and cords to the rear of the computer. Then, plug all computer power cords into electrical outlets.

You should now be ready to configure your system.

Power Supply To The MetraBus

Because I’S/2 design specifications limit power draw from the MicroChannel Bus, power for the MetraBus system must come from an suppIy to the MetraBus can be monitored, however, by using the power supply control register.

THE CONTROLLER BOARDS

external

supply. The presence of an active power

pCMDB-64 DRIVER BOARD

2C-3

The ~Ch4DB-64 is electro-optically coupled to the +15 volt line of the MetraBus. If the +- 15

volts is absent, a bit in the control register will be read high (1). Note that a low control bit

does not insure that the +15 volts is within specification nor that the + 5 and -15 volts are

present at all.

Creating a Back-Up Disk

Before you do anything with the pCMDB-64, it is strongly advised that you back-up your IBM

PS/2 model XX reference disk and the MetraByte CMDR-64 utility disk. This procedure is detailed in the IBM PS/2 operator’s manual and is briefly outlined in this section.

To copy the reference disk, make certain you have a blank, unformatted, 2.0 MB high-density

disk. Then,

1. Turn OFF the power to your computer.

2. Place the reference disk into the floppy disk Drive A.

3. Turn ON the power to your computer.

4. The IBM logo will now be displayed. Press [Enter].

5. The IBM PS/2 main menu will appear. Select Backup the Reference Diskette

6. The IBM PS/2 w-ill prompt you through the backup procedure. When you receive the

Copy complete....

and use this from now on. DO NOT WRIT&PROTECT THIS DISK! Be sure to place the original Reference Disk in a safe place.

message, remove the copy of the Reference Disk. Label the copy

Making a Working Copy

Because your origina reference disk is write-protected, you can not copy any .ADF files onto

it. Therefore, you must use the copy of the reference disk you created. Gather your copies of

the reference disk and the utility disk and follow these steps:

1. Turn the power to your computer OFF.

2. Place the copy of the reference disk in floppy disk Drive A.

3. Turn the power to your computer ON.

4. The IBM logo will now be displayed. Press [Enter].

5. The IBM PS/2 main menu will appear. Select

Copy an Option Diskette

Press IEnter].

6. The PS/2 will prompt you through creating a working disk. When copy complete. . . appears, turn OFF the power to the computer.

You are now ready to install the pCMDB-64 Board.

2C-4 METRABUS USER MANUAL

Configuring The System

Before configuring your system, you should have made a working diskette and installed the pCMDB-& Board. To configure the 1.~cMYDl3-64 Board,

1. With your computer OFF, place the working disk in floppy disk Drive A.

2. Turn ON the power to the computer. The computer will now

After the memory check has been run, the Configuration Error appears

computer

3. You now need to configure the system.

has

recognized a change of configuration. Press [Enter].

followed by two beeps. This indicates that

Error Code

If your

current system configuration allows you

165. . .

run its memory check.

Adapter

the

to assign a base address of 300h to the pCMDB-64 Board, you can automatically configure the system. To do this, at the prompt

4. If a base address other than 300h must be assigned, press

configuration prompt. This returns you to the main menu.

5. In the main menu, select

3. Set Configuration

Run Automatic Configuration press Y .

N at the Run Automatic

6. This enters you into the configuration menu. Select

Change Configuration

7. Use the cursor keys to scroll down through the configuration list until you reach

MetraByte PCMDB-64 MetraBus Controller

with the slot in which it is installed.

Highlight the base address. Use IF51 and [F6] to select the desired address.

If you need help making this decision, press [Fll.

8. Press [FlO] to store the

configuration in

RAM.

9. Remove the working disk from the drive and store it in a safe pIace.

The system should now be configured. Upon power-up, the computer will boot normally and you will have full use of the pCMDB-64.

NOTE: Although the

pCMDB-64

is capable of supporting up to 255 choices of Base Addresses, its @602b.ADF file contains only 16. This is because IBM’s setup program allows a choice of only 16 different Base Addresses. If you wish to use a base address other than what appears in the menu, you can modify the @602b.ADF file.

Modifying The @6028.ADF File

IBM’s configuration program allows 16 possible choices for each selection. In the case of the

base address, the

selections are not to your liking, use the GENADFXXE to generate a .ADF file including your

choices of base addresses. Be sure to copy the .ADF file to your working disk and proceed with the

configuration

p.CMDB-64

supports 255 possible choices for any named item. If the default

procedure described above.

THE CONTROLLER BOARDS ~CMDB-64 DRIVER BOARD

2c-5

Common Configuration Errors

If you have taken short cuts and skipped steps, you may have already encountered an error

message. Table 4-1 lists and describes

Table

4-I. Common Configuration Errors

some

of the most common

errors.

ERROR MESSAGE MEANING

lb3

Lomputer

adapter board. system.

* Conflict Two adapter boards have been

Setup cannot find the

appropriate .ADF file

Setup cannot

read the

.ADF file.

assigned the same address. /.LCMDB-@ board.

.ADF does not appear to be on the

working disk. copied to the working disk.

The .ADF ftie has been altered

using the incorrect syntax.

dOf.Sn’t

recogmze me

SOLUTION

Ke-lnstau

Select another address for the

Verify that the .ADF fiIe has been

Use GENADFEXE to alter the

.ADF file.

System Connections

This section describes

CMDR-64

MetraBus. Figure 2C-1 describes each signal conductor in the connector.

equipped with a DB37F’ connector which is used to interface the board to the

CONTROL WSTRB

ADDRESS

the connectors and cables used in

DATA BL’S

F4 El

CLEAR

l- Rp

r z

BUS

A-4

BUSY

+15 v

-15 v

+5 v

POWER

G-5 v +5 v +5 v +5 v

3 5 7

9 10 11 i3

15 IS

21 22 23 24 25 26 27 28 29 30 31 32 33 35 37 38 39

41 43

45 46

49 50

2 4 6 8

12 14

34 36

making

the

system connections. The

GND. GND.

GND. GND. GND. Gi\;D. GKD. GND. GND. GND. GND. GND. GND. GND. GNC. GND. GND. GND. GND. GND.

+5 v

-4-5 v i5 v POWER 15 v +5 v i

and

Conngure the

2C.6

Figure 2Gl. MetraBus Connector Pin-outs

METRABUS USER MANUAL

Once you have installed the l04IX3-64 Board and have configured it properly, you will need to connect the Board to the MetraBus I/O Boards Make this connection using either the MetraBus adapter cable (MetraByte Part #UCM-37-50) or a 37-Pin MetraBus cable (MetraByte Part #UCM-104-7).

If you are using the 37-Pin MetraBus cable, plug the end with the 37-pin D-type connector into the 37-pin connector on the back of the lKMDB-64 board. Then connect the other end to the MetraBus.

If you have elected to use the adapter cable, you will also need a standard MetraBus cable.

Plug the end of the adapter cable with the 37-pin connector into the connector on the rear of

the lKMDB-64 board. Then, connect the other end (with 50-pin connector) into one end of the standard MetraBus cable.

2C.5 PROGRAMMING

This section describes how to program the @viDB-64. Examples are provided when

necessary to clarify syntax or programming procedures.

Sample Programs

The utility disk provided with your ~.FCMDB& contains additional sample programs illustrating the features of the various MetraBus I/O boards. Refer to these programs if you have any difficulty programming the @MD’&64 to accomplish a specific task.

The sample programs and their descriptions can be accessed by typing: BASICA MENU at the

system prompt. You are then presented with a menu of Met&us I/O Boards. Select the appropriate board by following the instruction list on your computer screen. a board, an introductory description of the program will appear. Then, follow the instructions on the screen to run the program.

After you select

Using The PCMDB-64 To Control The MetraBus

The PS/2 has I/O locations for such things as disk drives, printers, serial ports, and other peripherals. The lKMDB-64 base address is located within this I/O space. The $MDB-64 responds to four byte addresses during normal operation. Table 4-2 describes these.

Table 4-2. pCMDB-64 I10 Addresses

VARIABLE READ WRITE

I/O ADDRESS

Base Address +0 Data I/O Path Base Address + 1 Address Pointer

Base Address +2

Base Address + 3*

FUNCTION

Power Check/Reset

NAME

DATAIO ADRmR MRESET

DATA DATA

DataIn Address + Status

PO.3 Byte 102

Data Out Address Reset

* This address is unassigned.

THE CONTROLLER BOARDS

PCMDB-64 DRIVER BOARD

ZC-7

All references to specific address locations will use the variable names DATAIO, ADRPTR, and MRESET as indicated in Table 3-1. Normally, variable assignments are done at the beginning of your application program.

10 DATAIO=768 'Declare Data I/O Location 20 ADRPTR=768 30 MRESET=770 'Declare RESET Location

'Declare Address

For example:

Pointer

Location

The following sections discuss address location functions in order of typical programming use. All references to the above locations assume a base address of 768 decimal (300h).

The Address Pointer (ADRPTR)

The lXMDB-64 Address Pointer points to a specific MetraBus I/O Board function to be accessed. Most MetraBus I/O boards respond to more than one address (typically 4 or 2) corresponding to different registers on the same board. Writing or reading to the different registers on a board initiates different actions or transfers different sets of data. Each MetraBus I/O board must have a set of unique, non-overlapping addresses to identify it from the other boards in the MetraBus system. The set of addresses for a board is set by a switch which determines the board base address. describing the specific I/O board.) The base address fixes the address of the first board

and the address of successive registers is found by adding 1 to the previous address.

(Refer to the section of the MetraBus manual

Once the MetraBus address pointer is set, it does not change until another OUT command changes it. The actual time necessary for the address pointer to latch and stabilize the MetraBus address is less than 10 microseconds.

The address pointer is used to point to a MetraBus I/O board address.

Since this address is latched on the CMDR-64, it can be read back using the BASIC INF command, for example 60 ADDRESS = lNl?(ADRFTR). Reading the address pointer returns 6 bits of address information and two bits of status information. These status bits are R/W and BUSY as shown in the following diagram.

Adress Byte

BIT D7

BUSY R/W A5 A4

NOTE:

The driver board inverts the polarity of the actual bus control

D5 D4 D3

A3 A2 Al

D2 Dl

signals.

Normally, the BUSY and R/W status bits are low (zero). When this is true, the data returned

identical to the contents of the address bus.

ZC-8

Example 1. Setting

Address Pointer

The following example illustrates how to set the address pointer to a MetraBus l/O board

(MEM-8) at address 12.

METRABUS USER MANUAL

10 ADRPTR=769 'Declare Address Pointer

Location

20 DATAIO=768 'Declare Data I/O Location 30 MRESET=770 'Declare MetraBus Reset Location 40 MEM8 = 12 'Declare HEX-8 Board Address 50 OUT ADRPTR, MEMB'Point to MEM-8 at Address 12

The Data l/O Register (DATAIO)

Once the address pointer has

been set, data may be written to and read from a MetraBus I/O board. Ail data transfer takes place through the DATAIO. Accessing specific functions on the MetraBus I/O board and passing data back to the computer via the DATA10 may be accomplished using the BASIC OUT command, for example 70 OUT DATAIO, 128. This

command outputs a value of 128 which might, for example, activate a relay on the MBM-8

relay board. The actual function that it specifies is dependent upon the board accessed. Data can be read from the Data I/O with a single INP comman d, as follows:

80 DAT = IXW(DATAI0)

The BASIC variable DAT contains data from a MetraBus output board. This means that if the

above INP command is issued after the previous. OUT command, variable DAT will contain a value of 128.

Power ChecWSofMare R&SET (MRESET)

A software reset causes all MetraBus I/O boards connected to the MetraBus cable to be reset to a known state.

Example 2. Programming a Software RESET

The following example illustrates use of the software RESET feature for all MetraBus I/O boards. Note that the value 00 is an arbitrary value and has no significance except as a space

marker following the mandatory comma.

OUT

MRESET, 00

Checking the Power Supply to the MetraBus

The MRESET value also allows you to read Bit 7 of the POS byte 102. This contains the state of the + 15 volt power supply. If the bit contains a 1, power is OFF. If the bit holds a 0, then the power is ON.

Note that the absence of a status bit does not guarantee the quality of the power supply. Its main utility is to determine if the remote power supply has been inadvertently shut-off.

By ANDing 128 with the read MRESET Address, the state of the external power supply can be determined, for example:

THE CONTROLLER BOARDS pCMDB-tX DRIVER BOARD x-9

70 STATUS = INP(MRJZSET) AND 128 'check power status bit 80 IF STATUS

= 1 THEN PRINT "POWER OFF";

'flag problem

Programming The pCMDB-64 Board

The three l.KMDB-64 I/O locations have distinct functions. Their order of execution generally follows a consistent pattern when programming any MetraBus I/O board. The following is a brief overview of programmin Detailed information concerning programmin manual.

Digital l/O Boards

Digital I/O boards are the easiest boards to control. Data can be written to DATA10 immediately after setting the address pointer. Both digital output and digital input boards typically

have

several 8-bit ports.

Example 3. Programming a Digital Output Board

In this example, a digital output board (MIO-32) is at Board Address 0 and the pCMDB-64 is at base address 768 (decimal).

g techniques associated with the various types of I/O boards.

g of specific boards are provided later in this

Lines 10 - 40 declare the locations of the MetraBus DATAIO, ADWTR, and the MRBSET functions, as well as declare the MIO-32 board address.

Line 50 sets the address pointer to the MIO-32 digital output board.

Line 60 outputs a value of 255 (decimal) to the MI032 setting all outputs

high.

10 DATA10 = 768 ‘Declare Data I/O Register 20 ADRPTR = 769 30 MRESET = 770

40 MI032 = 0

‘Declare Address Pointer location ‘Declare RESET address

‘Declare RIO-32 board address 50 OUT ADRPTR, MI032 'Point to MIO-32 at address 0 60 OUT DATAIO, 255

‘Output bit pattern ‘1111 1111‘

Example 4. Programming a Digital input Board

In this example, the digital input board (MII-32) board address 0 and the lKMDB-64 is at base address 768 (decimal).

Lines 10 - 30 declare the locations of the MetraBus DATAIO, ADFFI’R, and the MRBSET functions.

Line 40 declares the board address of the MI132.

Line 50 sets the address pointer to the MLI-32.

2c-10

Line 60 reads the contents of the &bit port and stores the result in DATIN.

METRABUS USER MANUAL

the

BASIC variable

10 DATA10 = 768 'Declare Data I/O Register 20 ADRPTR = 769 'Declare Addxess Pointer location 30 MRFSET = 770 40 MI132 = 4 50 OUT ADRPTR, MI132 'Point to MI-32 at address 4 60 DATIN = INP(DATAI0)

'Declare RESET address 'Declare MIX-32 board address

'Store contents of 8-bit port in DATIN

Analog Boards

Analog output boards use one MetraBus address-per channel. Setting the address pointer to the appropriate address and writing data to the DATAIO will produce an analog output (refer to Example 5).

Analog input boards require additional steps, however, in order to set the gain and resolution for the desired channel prior to taking data. Refer to Example 6 for an illustration of programming an Analog input board.

Using Compiled

The R/W bit goes high (non-zero) during a data write transfer for 10 microseconds. Additional data should not be written or read from the DATAIO while the R/W status bit is non-zero. The address pointer can be read, however, to determine when the R/W status bit returns to zero. 10 microseconds is very fast compared to BASIC interpreter execution speed for compiled (including BASIC) and assembled languages. Therefore, the R/W bit should be

monitored in all non-interpreted computer languages. Refer to the following timing diagram

for visuahzation of this sequence.

R/W

WSTRB

Several MetraBus boards use the BUSY status bit to indicate that their data is not ready for reading. Two such examples are the MAI- and the MTHERM-16 boards. The following

diagram shows the BUSY bit for the l&41-16.

Assembled Languages

IO,!&

5vs 1

APPROX. 20 ,,s FOR 8-BIT

3USY

NOTE: The actual bus signals are inverted from the status bits and

waveforms shown above.

hardware feature and can not be found via software.

THE CONTROLLER BOARDS j.GMDB-64 DRIVER BOARD 2c-11

Note also that the WSTRB signal is a

APPROX. 30 ps FOR 12--BIT

When monitoring the status bits or when only status information is required, ANDing the address pointer with 192 ( 27 + 26 = 192) returns the desired status information, as follows:

90STATUS

= INP(ADRPTR) AND 192

100 PRINT STATUS

The BASIC variable STATUS contains either 0,64,128, or 192 indicating the state of the D7 and D6 (the two MSBs) bits.

Device Interface

To aid the user in writing software for the lKMDB-64, on the PS/2, a device interface is included in the pCMDB-64 demo programs. The interface is essentially a device driver which can pass the base address to user-written code. The interface greatly aids the user in porting code from computer to computer with possibly different kCMDB-64 board settings.

The device interface gets installed during boot-up of the computer. The interface can handle up to five different uCMDB-64 boards in the system. The following is sample syntax for loading the device interface in the DOS CONPIG.SYS file with the first board at address 300h.

DEXICE =

In this search for the file in other directories. The /B: tells the driver that the number following is a base address in either hex “&H” or decimal format. The driver requires at least one lKMDB64 to be present and checks each l.KMDB-64 base address against values stored in the I’S/2 Prog-r

on to match the next base address in line. If an error is encountered, the computer will beep

and display the text in question with an explanatory message.

MDB64DI.SYS/B:&h300 {/B:BASE #2.../B:BASE #5)

case, the

MDB64DI.SYS file is assumed to be in the boot drive. A path may be added to

an-unable Option Select (POS) registers. After finding a match, the device interface goes

The ECONFIG.EXE program generates a new CONFIG.SYS file while preserving the old in a file called C0NPIG.BA.K. Before

running ECONPIG.EXE, make sure that the device interface

program MDB64DI.SYS is on your boot disk. To read information about an individual pCMDB-64 once all

~Ch4DB4-h

check successfully, a unique ID name is opened and can be read like a file with a record size of four bytes. During boot-up, the interface assigns an ID name starting from “MDB64IDl” up to “MDB64ID5,” corresponding to each Base Address appearing in the CONFlG.SYS file. Note that

the

interface accepts ID name WDB641D” which always returns information about the @~4DB-64 referenced by “MDB64IDl”.

xxx00 OPEN "KDB64IDx"

In BASIC, this would look as follows:

#l LEN=4

‘open

device interface for board x xxx10 FIELD #I,2 AS B$,2 AS H$ ‘describe the interface record xxx20 GET #l xxx30 BASE=CVI(B$) xxx40 HOS=CVI(H$)

‘read in the interface information 'GET

base address to an integer

'GET host 0 - PC/AT, 1 - PS/2

POS Byte Format

This section describes the POS (Programmable Option Select) addresses to which the lKMDB-

64 will respond upon power-up. Table

4-3

lists and describes each POS byte address used.

2c-12 METRABUS USER MANUAL

Table 4-3, POS Byte Addresses

POS ADDRESS(hex) FUNCTION/FORMAT

Returns 2BH - low byte of ID (Read Only)

100

101

Retums60H - high byte of ID (Read Only)

102

Card Enable (Read/Write)

Bit 7: MetraBus Power Status (1 = OFF, 0 = ON) Bits l-6: not used (Read as l’s) Bit 0: Card Enable

103

Base Address (Read/Write)

Bits O-7: Top byte of base address Bottom byte of base address always 0

104 and up Not implemented

The PS/2 interrogates the I/O cards to determine their type by reading the lower two bytes of

the board registers. The third byte is a control register with the bit assignments as indicated in Table 4-4 (it can also be read at base address +2).

Table 44. Third Byte Bit Assignments

BIT NO.

1-6

Card Enable (R/W) Unused (Read as 1) Men-&us Power Status (RO) (I= Off, 0 = On)

DESCRIF’TION

The fourth byte contains the high byte of the lKMDB-64 address.

THE CONTROLLER BOARDS

pCMDB-64 DRIVER BOARD

2C-13

26-14

M ETRABUS USER MANUAL

Chapter 2: The Controller Boards

2D.1 GENERAL

The REM-64 is one of four available controller/driver boards for use with the MetraBus industrial data acquisition and control system. As the serial communication card for the MetraBus, it allows MetraBus compatibility with virtually all makes and models of computers regardless of manufacturer. Remote control of the MetraBus system is possible for distances of up to 5000 feet. and the REM-44 while internal MetraBus data transfer rates exceed 80 kBaud.

REM-64 DRIVER BOARD

Data transfer rates of up to 19.2 kBaud are attainable between

Part 2D

the

computer

Rs232C and (20 mA

current

loop) and W22 protocols are supported with user selectable baud rate, bus control signal enable/disable (CTS, RTS, DTR, etc.), parity check, data format echo/no echo, etc. Every REM-64

has two RS-232

and two RS-422 I/O ports allowing up to 16 REM+% to be operated from a single computer I/O port. Twc LEDs on the REM-64 indicate the status of the on-board microprocessor, as well as the activity status of the REM-64 (whether it is the currently active REM-W. A functional block diagram of the REM-64 is provided in Figure 2D-1.

I I I I I

METRABUS

-CONDUCTOR CABLE

RS-232, RS-422

CURRENT LOOP

SERIAL PORT

REM-64 SYSTEMS

I I I I

M-+ SERIAL PORT W CONTROLLED v

UP TO 14 ADDITIONAL

REM-64 PROCESSOR

’ INTERFACES

L____-____---_____-__-__________________-----~

SECOND REM-64

BOARD

MICRO-

PROTOCOL

CONVERTER

METRAEUS

CABLE

DRIVER/ _:

RECEIVER

Figure 2D- I. REM-64 Functional Block Diagram

The REM-64 supervises all I/O operations between the computer and MetraBus I/O boards within your system. All necessary control signals are generated within the REM-64 so that the user need not be concerned with system-level data transfer.

A 50-pin connector on the REM-64 connects to the MetraBus I/O boards via the MetraBus cable. Functionally, the MetraBus has a parallel-bus architecture with the cable carrying all data, address, and control signals as well as distributing power on the MetraBus. Ground

conductors are interleaved between all signal lines to increase system noise immunity. The MetraBus has been designed to allow cable lengths of up to 100 feet.

THE CONTROLLER BOARDS

REM-64 DRIVER BOARD

2D - 1

The MetraBus industrial data Aaquisition and control system in conjunction with your present computer allows higher speed, greater accuracy, and totally autonomous operation in previously slow, troublesome applications.

20.2 FEATURES

Connects to virtually all computers regardless of manufacturer.

MetraBus remote operation up to

Baud rates up to 19,200 bits per second.

Control up to 16 MetraBus systems from one serial port.

Control up to 512 Digital I/O lines per system.

Control up to 256 ( 8 or 12-bit) ADCs per system.

Control of 64 @-bit) DACs per system.

Extremely cost effective.

Adapts to your changing requirements.

1.2 km.

2D.3 SPECIFICATIONS

Number of Serial I/O Ports:

Serial Port Configuration:

Power Consumption

Environmental

Operating Temperature:

Storage Temperature:

Physical

MetraBus Cable Type:

i;), &si and 20 rnA Current Loop

Data Terminal Equipment (DTE)

285

+5 Volts:

+15 Volts:

-15 Volts:

IT-IA (typical>, 325 rn.4 (max.) 30 II-& (typical), 45 mA (max.) 30 mA (typical),

45 mA

(max.>

0 to 70” c

-55

to 4125’ C

Humidity: 0 to 95%, noncondensing

Size:

16x4.75inches (40.63 x12.06

50conductor ribbon cable

an)

2D-2

MetraBus Connector:

METRABUS USER MANUAL

3M 3425-6050

2D.4 SWITCHES

This section describes the board address switch, serial bus selection switch, and the protocol selection switch.

The REM-64 Board Address Switch

The multi-drop design of the REM-64 allows control of up to 16 REM&Is from a single computer serial port, Every REM-64 must have a distinct bus address in order to differentiate it from other REM&& on the serial bus. Available bus addresses range from 0 to 15 and are selected via the board address switch located to the far left of the REM-64. The numbers silkscreened above the switch assembly indicate the values of the switches immediately below them. The numbers have value only in the ON position. Setting the board address switch is a matter of selecting an unused address and setting the corresponding switch(es) ON. For example, in order to set a bus address of 4, the switch with the value of 4 immediately above it would be turned ON while the others would be OFF. Figure 2D-2 shows the board address switch set for a bus address of 10.

Figure 20-2. Setfing the Board Address Switch

2 s 4

The Serial Bus Selection Switch

The serial bus selection switch is a 3-gang DIP switch located to the right center of the REM-64

driver card. There are three available serial bus choices: RS-232C, RS-422, and 20 m4 current loop configuration. You are not required to understand these three bus configurations to operate the REM-64 since your choice is dictated by the available serial interface of your computer. Check the technical reference manual for your PC to determine which of the three interfaces you will use. Then, set the REM-64 serial bus selection switch accordingly. (See Figure 2D-3.)

THE CONTROLLER BOARDS REM-64 DRIVER BOARD

2D-3

The Protocol Selection Switch

The REM-64 design provides maximum serial protocol flexibility. The protocol select switch is an S-gang DIP switch, Iocated to the center left of the REM-64. This switch allows user selection of data transfer rate (Baud rate) , parity, # of data bits, echo on/off, and enable disable of various bus control lines. For the purpose of operating the MetraBus system, it is not necessary that you understand the protocol terms or even their functionality. However, some of these are explained in the serial communication tutorial provided in Appendix A.

Check the technical reference manual for the computer and/or serial interface card that you are using to find out which lines are implemented at the computer end of things. have this information, set the switches on the REM-64 protocol select switch (See Figure 2D-4.)

to match. Table 2D-1 lists the switches and their functions.

Once you

2D-4

SET FOR BUS CONTROL LINES DISABLED, 7 DATA BITS, NO ECHO, NO PARITY, 4800 BAUD.

Figure 204. The Protocol Selection Switch

METRABUS USER MANUAL

Table 20-l. Protocol Selection Switch Settings

Protocol slection notes:

Switch

# Function

1,2 Bus Control Lines Enable/Disable. Both switches set

to ON = Enable. Both switches set to OFF = Disable.

3 # of Data Bits. ON = 7 Data Bits. OFF = 8 Data Bits.

Echo/No Echo. ON = Echo. OFF = No Echo.

Parity. ON = No Parity. OFF = Even Parity.

6,7,8 Baud Rate. Switches are used to select Baud Rate as

follows: Baud Rate

300 ON 606

1200

4800 ON OFF OFF 9600 OFF ON

ON ON ON OFF

OFF

19200 OFF ON OFF

The REM-64 is configured to transmit 1 Stop.Bit.

1. The RS-232 protocol supports all standard IBM asynchronous control lines when

2. ENABLED and only the transmit (pin 21, receive (pin 3), and signal ground (pin 7) when DISABLED.

The RS-422 protocol supports the Clear To Send (CTS) and Ready To Send CRTS) lines, in

3. addition to transmit, receive, and ground when ENABLED and only transmit (pins 4 and

5), receive (pins 8 and 91, and signal ground (pin 1) when DISABLED. EL4 standard current loop configurations support the transmit lines (pins 9 and 11) and

4. the receive lines (pins 18 and 25).

2D.5 CONNECTORS

This section describes the MetraBus connector and the cerial connectors.

MetraBus Connector

The REM-64 passes information to and receives data from the MetraBus I/O boards via the MetraBus cable. The MetraBus pin-out diagram below shows the physical layout of this interface connector.

THE CONTROLLER BOARDS

REM-64 DRIVER BOARD

2D-5

DATA 3X

CONT?C)L

ADDRESS ’

BUS

FOWER i

T-

m /

-1

E3 D-4

D5 33 57

CLEAR

WSTR B

-27

XT 33

ii4

Ti5

BUSY

+I5 v

-15 v i5 v

4-5 v

45 v i5 v

+5 v

3 5

9 10 :1 1 3

17 19 20

2: 23 24 25 27 28 29 30 3i 33 34 35 36 37 38 39 40

L *, 43

45 47 49

12 14 16 i8

42 44 46 48 50

6 8

GND. GND. GND. GND. GND. GN3. GN3. GIN]. GN3. GNC. GNG. GNG. GNG. GNC. SND. GND. GND. GND. GND. GND. +5 v +5 v +5 v +5 v +5 v i

POWER

Figure 20-5. MetraBus Connector Pinouts

Serial Connectors

The REM-64 driver card contains four serial connectors: two are KS-232 compatible, and two are for RS-422. Note that your PC may require a null modem, depending upon its serial port configuration (DTE/DCE). The REM-64 is shipped as Data Terminal Equipment (DTE), allowing connection of additional REM-&s using standard serial cables. The current loop communication interface is not multi-drop compatible. assignments for both the FS-232 and FS422 interfaces.

RS-232 AND CURRENl LOOP RS-422

TRANSMIT DATA (TO) 2

RxEivE DATA (RD) 3 READY TO SEND (R-IS) 4 CLEAR TO SEND (CTS) 5

DAiA SET READY (DSR) 6

SIGNAL GROUhD 7

DATA CARRIER DEECT (DcD) 8

XMli DATA * 9

XMIT DATA - I

18 RCV DATA *

20 DATA T.RA%MlT READY (DTR)

Figure 2D-6 illustrates the pin

SIG GROUND :

RTS- 3

XMIT DATA 4

XMIT DATA- 5

RTS 2

0 l

6 CTS-

7 CTS 8 RCV DATA 9 RCV DATA-

- 20 mA CURRENT LOOP

Figure 20-6. Serial Connector Pinouts

2D-6 METRASUS USER MANUAL

25 RCV 3ATA .

Multiple REM-64 Connections

Every REM-64 contains two sets each of 135-232 and RS-422 connectors. Each set of connectors is configured in parallel so that multiple REM-+ may be interconnected. In a typical multidrop wiring scheme, the REM-64.s might be networked in a ‘7”’ type system. A11 REM&s in

the network monitor the serial bus at all times. Only the active REM-64, as targeted by the board select command, decodes the REM-64 commands and enables those MetraBus I/O boards connected to it.

2D.6 USE OF THE AUXILIARY POWER SUPPLY

The REM-64 does not draw power from the PC. As a result, an auxiliary power supply such as Keithley MetraByte’s MBUS-PWR is required to operate I/O Boards in your system. The use of other supplies is permitted as long as they meet the MBU!S-PWR specifications. See the MBUS-PWR section of this installation procedure.

the

REM-64 as well as ail MetraBus

manual

2D.7 INSTALLATION OF THE REM-64

The REM-64 is a serial I/O board specifically designed for use with the MetraBus system. Its level of serial protocol support is equivalent to the standard IBM PC/XT asynchronous adapter board. You should bear this in mind when interfacing the REM-64 to other serial devices (computer, terminals, controllers, etc.). As mentioned earlier, the use of a null modem (crossing pins 2 and 3) may be required for devices configured as Data Communication Equipment (DCE) .

for specifications and

Once you have configured your REM-f%, you will want to connect it to the computer and MetraBus I/O Board(s). The procedure outlined below will aid in the installation of your REM-&. You should also refer to those sections of this manual that deal specifically MetraBus I/O boards that you are using for a full discussion of their functionality.

You may want to refer to the serial communication tutorial provided in Appendix A. This

explains the basics of serial communication protocol interfacing. To instaIl the REM-&i,

Remove power from the computer.

1. Connect one end of your serial cable W-232 or RS-422 cable) to the computer’s serial port

2. and secure it using the two smaIl screws on the cable connector. Connect the other end to one of the REM-64 serial ports. Since each pair of ports is wired in parallel, it doesn’t matter which port your use. Additional REM-&Is may be connected at any time. Follow the procedure below for each additional REM-64 being used.

Connect the REM-64 to the first MetraBus cable connector. Make sure that the locking

3. tabs are indeed locked around the mating portion of this connector.

Unplug the power supply from line current prior to MetraBus cable interconnection.

4. Connect the MBUS-PWR to a second MetraBus connector.

Connect all other MetraBus I/O boards to the cable.

5. Repower your computer and plug in the power supply.

with the

THE CONTROLLER BOARDS REM-64 DRIVER BOARD

2D-7

NOTE: Two resistor termination networks are shipped with every REM-64. These resistors should be installed on the MetraBus I/O

board furthest from the REM-&. The sockets RN1 and RN2 are

provided for this purpose.

These resistors minimize signal reflections due to long cable lengths. They are optional, however, and have little effect upon cables of 50 feet or less.

2D.8

PROGRAMMING THE REM-64 TO CONTROL THE METRABUS

Programmi ng the REM-64 uses a set of eight simple comman ds. Designed for maximum power and flexibility while maintaining the elegant simplicity that is evident throughout the MetraBus line, the REM-64 command syntax provides the user with immediate access to MetraBus I/O board functionality. The commands A command interpreter on board the REM-64 detects any transmitted errors in command syntax, data parameters out of range, etc. and generates an error message describing the type of error detected. The REM-64 commands are listed in Table 2D-2.

Table 2%).2. REM-64 Commands

Command

B A

C S H D

Name

Board Select

Address Pointer

Write Data

Read Data

Clear MetraBus

status

Hex

Decimal

Targets specified REM-64 by Bus Address. Selects the specified MetraBus I/O Board. Transmits instructions to the selected I/O board. Retrieves data from the l/O board via the REM-64 Resets entire Retrieve current Board Address and status bits. All dara transmitted and retrieved in Hexadecimal. All data transmitted and retrieved in Decimal.

The commands are further described below. Note that all of the provided examples are written in IBM BASICA as irnpIemented on IBM PC/XT and PC AT compatibles. Similar routines can be written in other languages on other computers.

may

be sent in either upper or lower case.

Function

MefraESus

to power-up status.

2D-8

HINT:

When first writing application programs for the REM-64, it is good idea to return all data to string variables. This is because typing errors, illegal parameters, etc. are flagged by the REM-64 and error

messages are

transmitted to the COMM buffer. You will never see these messages if you assume that integer data should be returned. Characters that are printed as integers will have a value of zero. This could cause a great deal of wasted time if you assume that the I/O

boards are not operating correctly. Once the program is working and

debugged, change back to the integer variables.

The “B” Command - Board Select

Before any MetraBus I/O board can be addressed, the REM-64 must be targeted. This is done using the B command, followed asynchronous communication board such as Keithley MetraByte’s COM-422 configured as “COMI” and a REM-64 with an address of 4.

METRABUS USER MANUAL

by the

REM-64 address. The examples assume an

When communicating with the REM-64 via the serial communication port on your computer,

the BASIC PRINT # and INPUT # statements may be used to respectively send information to and receive data from the MetraBus system.

10OPEN "COM1:9600,N,8,1" AS #l

20PRINT #l, "B4" 'Print

Once a REM-64 is targeted, commands may be issued to any MetraBus I/O boards connected to that REM-64 via the MetraBus cable. The address pointer, write data, and read data commands (A,W,and R respectively) are used to instruct the various I/O boards connected to the targeted REM-64 MetraBus cable. These commands are discussed below in order of common usage.

'Open COMl port Q 9600 baud,

'no parity, 8 data bits, and '1 .stop bit as FILE #l

"B4" to FILE#I thus selecting

'REM-64 Address 4.

The “A” Comnand - Address Puinfer

The function of the address pointer is to point to a specific MetraBus I/O board. There are 64

available MetraBus I/O addresses that may be “pointed to” by the REM-&L Each MetraBus I/Q board must have a unique, non-overlapping board address in order to identify it from other boards in the MetraBus system. (Refer to the section “Setting the board address” for the relevant I/O board.) Some MetraBus I/O boards use more than one MetraBus address, so that caution must be exercised when setting a board address. Again, the sections of this

manual delaying with your specific I/O boards should be consulted prior to attempting use of

the REM-64 and I/O boards. Writing the board address to the MetraBus address pointer sets the current I/O board address and targets that board for use. Once the address pointer is set to a particular board address, data can be written to or read from the board. The following example illustrates how to set the address point to the I/O board (an MIA-16, for example) at address 12.

lOlREH64 =4 2OMAI16 = 12 300PEN "COM1:4800,N,7,1"

40 PRINT #l, "B";lREX64 'Target REX-64 at Addxess 4

50 PRINT #l, "A";MAI16 'Point to MA116 at Address 12

Note that in the above example we have defined the I/O board address as a variable. This is

standard programmin simple redefinition of the address rather than an entire restructure of the program) with the routine that follows. This practice will be followed in aI1 examples in order to make them generally applicable.

Variable declaration is generally done at the beginning of your application program for ease of access as follows:

lOMEM8=0 'Declare MEM-8 address

2OMAIl = 4 ‘Declare first MAI- address

3OMAI12 = 8 'Declare second MAI- address

Once the MetraBus address pointer is set, it does not change until another A command

changes it.

THE CONTROLLER BOARDS REM-64 DRWER BOARD

g technique since it allows for reassignment of any I/O board (with a

'Declare REM-64 address 'Declare MAI- Board Address

#l 'Open COMl @ 4800 baud, no

'parity, 7 data bits, and 1 'stop bit as file #l

2D - 9

The “S” Command - Status

Since the board address is latched on the REM-f& it may be read back using the 5 command as follows:

PRINT #l, "S"

100

INPUT #l, ADDRELSS

The BASIC variable ADDRESS contains the current MetraBus I/O board address.

‘Send Status command to

'target REM-64 'Get data from the 'Communication Buffer

Reading the status returns six bits of address information and

These status bits are

R/W and BUSY as shown below.

two bits

status information.

Address Byte

BIT D7 D6

BUSY R/W A5 A4

D-I DO

Al A0

Normally, the BUSY and R/W status bits will be low (zero). (Note that the driver board inverts the polarity of the actual Bus control signals.) When this is true, the data returned will be identical to the address. The REM-64 may be used with assembled or compiled languages

with no fear of active status bits since the serial nature of the data transfer in conjunction with communication buffer

access times are quite slow in comparison to A/D conversion times.

The “w” Command - Write Data

Once the address pointer has been set, data may be written to and read from a MetraBus I/O board. Writing to the current I/O board involves no more than sending the W command

followed by the data value corresponding to the function to be accessed (see those sections of this manual dealing with the specific board). The following example accesses an MEM-8 electromechanical relay board and closes switch 3.

2D-10

10=8=4 2OlREM64 = 0

3OOPEZi “COM1:9600,N,7, 1” AS #l. 40 PRINT #l, “B”; l-64

50 PRINT #l,"A";EEM8 60

PRINT #l, “W”; 2A3 ‘Activate

‘Declare MEX-8 Board Address IDecLare REM-64 at Address 0

'Open COMM port as File #l

‘Select REX-64 at address 0 ‘Point to MEX-8

switch 3 of MEM-8

This program outputs a value of 8 (2*3) which closes relay number 3 on the MEM-8 relay board (see the MEM-8 section of this manual for a complete discussion of MEM-8 functionality).

The “R” Command - Read Data

Reading data from MetraBus input (analog and digital) boards may be accomplished through

the use of the R command. In addition, all MetraBus Output Boards contain a data readback

feature that enables the user to verify transmission of data to the board. This allows for

METRABUS USER MANUAL

verification of data integrity which may become important when using a REM-64 at very high baud rates over long distances or where the MetraBus system is used in an electrically noisy

environment. For example, if. we use the above program and wish to make sure that the correct relay was closed we could add the following lines of code:

70PRINT #1, "R"

INPUT #1, RELAY

'Read data from the MEM-8 ‘Get data from the COMM buffer

90PRINT RELAY 'Display data on the CRT

The BASIC variable RELAY will contain data from the MetraBus I/O board previously targeted by the address pointer. All MetraBus output boards latch data sent to them, and therefore,

have

data readback capability.

Data may be read from MetraBus input boards in exactly the same way. For example, to read

the status of the inputs lines from a ME-32 digital input board, the following program may be

used:

lOMII32 2OlREM64 30

OPEN "coM1:4800,N,7,1" AS #1

40PRINT #l,"B";lREM64

50 PRINT #l,"A";MII32

‘Declare MII-32 Board Address

= 1 'Declare REM-64 Address

'Open COMM port as file #l 'Select REM-64 at address 1 'Point to MII-32

60 PRINT #l,"R" 'Send data from MII-32 (block 0)

7OINPUT #l,BLOCKO 'Get data from COMM buffer

80PRSNT BLOCK0 'Display data on CRT

The “C” Command - Clear MetraBus

A software reset causes all MetraBus I/O boards connected to the MetraBus cable to be reset to a known state. This reset state is described in the section covering each MetiaBus I/O board.

The following example illustrates use of the software RESET feature for all MetraBus I/O boards connected to the selected REM-64 MetraBus cable.

lOOPEN "COM1:96OO,N,8,1" AS #1 20 PRINT #1, "B2" 30PRINT #l "C"

The “H” and “D” Commands - Hexadecimal and Decimal

These two data format commands can be used to specify whichever data format you are comfortable with. The power-up/default status is decimal. A subsequent PNNT #l, “H” command will change this to hex format.

Programming The REM-64 To Control The I/O Boards

As described above, the execution of REM-64 co pattern when programming any MetraBus I/O board. The following is a brief ovetiew of programming techniques associated with the various types of I/O boards. The following examples illustrate programmin Detailed information concerning programmin description.

THE CONTROLLER BOARDS

'Open serial COMM port 'Select REM-64 at address 2 'Send system CLEAR command

mmands generally follows a consistent

g techniques used with both digital and analog I/O boards.

g for specific boards can be found in the board’s

REM-64 DRIVER BOARD

ZD-11

Digital l/O Boards

Digiti I/O boards are the easiest to control. Data can be written to the board immediately after setting the address pointer. Digital output boards typically have several &bit ports. In the following example, a digital output board is at boarda address 4 and the REM-64 is at address 0.

lOMIO32 = 4 'Declare MIO-32 address 201REM64 = 0 'Declare REM-64 address 300PEN "COM1:9600,N,8,1" AS #1 'Open COMl port as file #1

40 PRINT #l,"B";lREK64 'Select REM-64 at address 0

50 PRINT #1, "A";MI032 60PRINT #l, "W255" ‘Output bit pattern 1111 1111

70CLOSE #l

Lines 10 and 20 declare the address locations of the REM-64 and MIO-32, respectively. Line 30 opens the serial communications port as file #1 with a data I/O format of 9600 Baud,

no parity bit, eight data bits, and one stop bit.

'Point to MIO-32 at address 4

'Close file #l

Line 40 selects

the

EM-64 declared previously. Line 50 points to the MIO-32. Line 60 outputs a value of 255 to the digital output card setting all outputs of block 0 high. Digital input boards, like digital output board, typically have several &bit ports. After the

address pointer has been set to the MetraBus board address, data can be read from the board

using the R command.

Ln the following example, a digital input board (MII-32, for example) is

at MetraBus address 4 while the REM-64 is at address 2. lOMII32 = 4

201-64 = 2

3OOPEN 40

PRINT #l, "B"; lREM64 'Select REM-64 at address 2

PRINT #l, "A";

~COM1:9600,N,7,1"

MI132

60PRINT #I, "R"

INPUT #l, BLOCK2

'Declare MII-32 address

'Declare REX-64 at address 2

#1 'Open COMl port as file #1

'Point to Block 2 of MII-32 'Transmit data from MII-32 'Retrieve data from COMM buffer

BOPRINT BLOCK2 'Display data on CRT

90CLOSE #1

'Close file #l

Lines 10 and 20 declare the addresses of the MIT-32 and the REM-&L

Line 30 opens the serial communication I/O port as file #1 at 9600 baud,

parity, 7 data bits,

and 1 stop bit.

2D-12

Line 40 selects the REM-64 previously declared. Line 50 points to the MS32. Line 60 tells the REM-64 to send the data from the MIS32 back to the computer. Line

retrieves this data from the communication buffer.

Line 80 displays this data on the CRT screen.

METRABUS USER MANUAL

Analog l/O Boards

Analog output boards use one of the available 64 MetraBus addresses per channel. Setting the address pointer to the appropriate address and writing data to the board will produce an analog output. The following exampIe voltage.

shows

how to set the address pointer and output a

lOMAO = 8 'Declare MAO8 Board Address 202RRM64 = 8

'Declare REM-64 at address 8

3OOPHN "coM1:9600,N,7,1" AS #1 'Open COMM port as fil.e #l

40 PRINT #l, "B"; 2REM64

'Select RHM-64

at address 8

50PRINT #l, "A"; MAO8 + 'Point to channel 3 of MAO-8 60PRINT #l, "Wl92" 70CLOSE #l

'Output corresponding voltage 'Close file #l

Lines 10 and 20 declare MAO-8 and EM-64 addresses. Notice that these addresses are the same. This is alright since the REM-64 address is essentially an address on the serial bus and is not related in any way to the 64 available MetraBus addresses.

Line 30 opens the serial communication port as file #1 for data transfer at 9600 baud, no parity bit, seven data bits, and one stop bit.

Line 40 selects the REM-64 previously declared.

Line 50

points to the MAO-8 .

Line 60 tells the MAO-8 to output a voltage corresponding to the integer 192. (See the MAO-8 description for more

Line 70

and 80 close file #l and end the program.

information.)

Analog input boards require additional steps in order to set the gain and resolution for the desired channel prior to‘collecting data. -

MA116 = 16

lRHM64=1

30 OPEN "COM1:9600,N,7,1" AS #l 40 50

PRINT #l, PRINT #1,

"B";lREM64

"A";

MAI16+2

60 PRINT #1, "W";l8

PRINT #I, "A'&; MA116

PRINT #l,"WOO"

PRINT #l, "A";MAI16

;:O PRINT #l

II R"

110 INPUT #l: LSB 120 PRINT #l, "A"; MA116 130 PRINT #l, "R"

140

INPUT

#l, MSB 150 CLOSE #l 160 AIN=MSB*16 + LSB/lB

'Declare MAI- address 'Declare REM-64 at address 1 'Open COMM port as file #1 'Select REM-64 at address 1 'Point to GAIN/CH selection mode 'Set gain to +/-

5V range on Ch 2 'Point la-bit conversion mode 'Starts la-bit A/D conversion

'Point to data LSB's 'Read data back to COMM buffer 'Store data

in variable

LSB

'Point to data MSB's

'Read data

back to CONM buffer 'Store data in variable MSB 'Close file #l (COMM port) 'Combine

bytes

form data

value

170 PRINT AIN

Lines 10 and 20 declare MAI- and REM-64 addresses. Line 30 opens the serialcCommunication port as specified parameters.

Line 40 selects REM-64 at address 1.

THE CONTROLLER BOARDS REM-64 DRIVER BOARD 2D-13

Line 50 points to GAIN/CH select mode of MAI-16.

Line 60 sets the gain to +5 V on channel 2. Line 70 points to 12-bit conversion mode of MAI-16. Line 80 starts the A/D conversion process. Line 90 points to LSB data from the A/D conversion process. Line 100 reads the LSBs back to the computer COMM buffer.

Line 110 gets the data from the buffer and stores it is a variable LSB. Line 120 points to MSB data from A/D conversion process. Line 130 reads the data MSBs back to the computer COMM buffer. Line 140 gets the data from the buffer and stores it in variable MSB.

Line 150 closes file #l (the COMM port).

Line 160 combines the LSBs and MSBs to form a single data byte.

Line 170 displays the data on the CRT screen. There is a good deal of redundancy in the above routine that would normally be ehrninated in

actual usage. It is shown here only for the sake of step-by-step instruction. See the MAI- for

details concerning the various functions on the board.

Using Compiled & Assembled Languages With The REM-64

The use of compiled and assembled languages requires no special precautions when used

with the REM-64 since even at very high data transfer rates (19,200 baud) the serial nature of

the data transfer combined with buffer access times are magnitudes slower

conversions. When using the IEM-64, we are, therefore, not “taIking” directly to it or any of

the I/O board but must pass through this data buffer. You can see that with very fast

program execution times i.e., compiled. or assembled programs, you are actually monitoring

the status of the communication buffer and not I/O board activity. The S command

(STATUS) is implemented for address verification and for future use as far as the status bits

are concerned.

NOTE: If your data-monitoring routines attempt to write data or commands to the MBB-32 while the circuitry is busy, problems will arise. Therefore, when gathering data from slow circuitry, design your data collection routines so that they actually retrieve data and/or polI the BUSY bit using the S command prior to assuming that no data has been produced.

Generally, it is a good idea to have the computer simply time-out while waiting for data from the COMM buffer. IBM DOS manual for further information concerning time out definition.

than

most A/D

See the

2D-14

METRABUS USER MANUAL

Chapter 3: The Power Supply Boards

3A.1 GENERAL

The PWR-55 and PWR-100 are auxiliary power supplies for the MetraBus industrial data acquisition and control system. These boards are predecessors to the newer MBLJS-PWR board (see Chapter 3, Part B). The Pm-55 and PWR-100 supply required power for all MetraBus I/O boards. When a PWR-55 /PWR-100 is used, the only power drawn from the

host PC is for the MetraBus controller/driver card. Both the PWR-55 and the PWP-100 are 19”

rack-mountable in either a standard NEMA type enclosure or the MetraByte RMT-02. The PWR boards furnish +5 VDC, +15 VDC, -15 VDC, and ground signals on the MetraBus

cable. PWR-55 is 55 W supply, PWR-100 power is 100 W. Either board must match the anticipated power draw of your MetraBus system. Both supplies contain AC line filters that exceed IL478 and UL1283 specifications and comply with UL, VDE, CSA, and IEC safety standards.

NOTE: Connect only a single power supply to a single MetraBus

cable. For a MetraBus requiring more than 100 watts of power, contact the factory for assistance.

Part 3A

PWR-55/PWR-I 00 BOARDS

Input voltages of 90 to 125 VAC or 180 to 250 VAC along with input frequencies of 45 to 65 Hz

to -63 Hz for PWR-100) allow the use of both U.S. and European standard line current. The PWR-55 works with either 110 or 220 VAC interchangeably, while the PWR-100 requires a jumper change for 220 VAC operation. The jumper is clearly marked on the board. The supplies are approximately 65% efficient while providing 4000 Vrms of isolation from standard 120/220 VAC lines. The PWR-55 and the PWR-100 are switching type supplies with hold times of 16 ms (20 ms for the PWR-55). Both supplies feature a soft start mode, are current limiting and have linear regulation on all outputs. Extra line filters and optional power capacitors are available for various applications. Contact the factory (See Chapter

for further details concerning those applications that may require these power options.

Certain MetraBus I/O boards require the use of either power supply. Any system using the MID-&l, or REM-64 interface/driver cards, the MAI- analog input board, the MAO-8 analog

output board, certain configurations of the MCN-8, and any MetraBus system that draws more than 2 Amps will require the use of an auxiliary power supply.

3A.2 FEATURES

Plugs into any MetraBus cable connector

Meet UL, VDE, IEC, and CSA approval

90-120 VAC or 180-250 VAC switch selectable

21.)

Isolation to 4000 Vrms

THE POWER SUPPLY BOARDS

PWR-55/PWFi-100 BOARDS

3A-1

AC line filter built-in

Status LEDs and multiple test points

Convection cooled

45-65 Hz (47 - 63 Hz for PWR-100) input allows European voltages

3A.3 SPECIFICATIONS

Input Voltage:

to 130 VAC

180 to 250 VAC

Input Frequency:

Isolation:

Operating Temperature:

Hold up Time:

Output Ratings:

MetraBus Cable Type:

MetraBus Connector:

to 63 Hz (45 to 65 Hz for PWR-55)

4000 vrms

0 - 70” C (derate 2.5% per degree over 45” C)

16 ms (20

5 VDC @ 12

+15 VDC @ 3

-15 VDC @ 3

ms for PWR-55)

A (5 A for PWR-55)

A (2 A for PWR-55)

A (2 A for PWR-55) 50-conductor ribbon cable. 3M 3425-6050

3A.4 INSTALLING THE PWR-55/PWR-100

Using the PWR-55 or PWR-100 requires a line cord with a plug for the avaiIable type of power

(110/220 VAC). The cord should be long enough to reach from the wall outlet to the

MetraBus cable.

NOTE: Perform the following procedure only under no-power conditions.

Visually inspect the PWR-55 or PWR-100 for loose wires, screws, or components.

2. Secure the three line wires to the line input terminals u2) of the PWR-55/PWR-100 and replace the plastic cover for protection. Be sure to install the green earth-ground line.

3. Select an unused MetraBus cable connector and plug the power supply into the cable, making certain that the locking tabs on the connector are locked around the mating portion. The connectors are keyed for your protection. Check the keyways for correct alignment prior to plugging them together. Avoid the use of force with these connectors.

4. Plug the line cord to a source of power.

3A.5 USE OF OTHER POWER SUPPLIES

3A - 2

You may use power supplies other PWR-55/PWR-100 specifications.

METRABUS USER MANUAL

than

the PWR-55/PWR-100 so long as they supplies meet

3A.6 THE MTAP-1

The MTAP-1 is a power break-out board for the MetraBus system. The board can bring power to the MetraBus from an supply to support user circuitry. Three LEDs show power supply status. A green LED lights to show that +5 V power is on, while red and yeflow LEDs display power

+15 V and -15 V supplies, respectively.

A 3 X 1.5 inch breadboard area is included on the board to facilitate the installation of user

circuitry. Terminal posts connected to the power supply inputs are at the edge of the

breadboard area.

The MTAP-1 provides direct connections to the power distribution conductors in the cable. To power a MetraBus system with an external power supply, plug the MTAP-1 into the MetraBus cable and connect the supply inputs to their corresponding screw terminals on the MTAP-1.

Do not connect containing a PWR-55 or PWR-100 board of that has Fuse FI installed

on an MDB-64.

external

supply or can extract power from the MetraBus power

conditions for

CAUTION

power supplies to any MetraBus system

THE POWER SUPPLY BOARDS

PWR-55/PWR-100 BOARDS

3A-3

3A-4 METRAEWS USER MANUAL

Chapter 3: The Power Supply Boards

Par-t 3B

MBlJS-PWR BOARDS

GENERAL

The MBUS-PWRs are auxiliary power supplies for the MetraBus industrial data acquisition and control system. A 120 VAC version is for use in North America and carries a /NA designation; similarly, a 220/240 VAC version is-intended for the European market and carries a /EURO designation. Both versions are 19” rack-mountable in either a standard

NEMA type enclosure or the MetraByte RMT-02 frame. Both versions also meet applicable

IEC, UL, CSA, and VDE safety requirements. MBUS power supplies are replacements for the PWR-100/55 and provide multiple supply operation.

The MetraBus power distribution system is modular to accommodate the needs of small and

large systems. This feature allows you to

without limiting the size of the system. system, you must first estimate the power load on the basis of your intended board complement. The three basic power distribution systems are PC power, single power supply, and multiple power supplies.

minimize the cost of power supply components

However, in configuring the power distribution

For a small system that will use only digital boards requiring under 2 A of +5 VDC power, the

PC can power the boards directly. In this configuration, you must install fuse Fl(1 A) on the

MDB-64 driver board for the PC to power the digital boards. Boards such as the MID-64, REM-&, MAI-16, MAO-8, and the MCN-8 require +15 or -15 VJX and must use an MBLJSPWR board. A typical small system configuration is depicted in Figure 3B-1.

1 PC

MDB-64

-i5

VDC

Figure 3B-I. Small System

In a medium-size system, where the power load is under 100 W, attach an MBUS-PWR board to the MetraBus cable. Remove Fuse Fl from the MIX-64 board, and plug the cable into

either power connector of the MBUS-PWR board. MBUS-PWR board to further daisy-chain I/O boards. For even power distribution under near-full loads, place the MBUS-PWR board in the middle of the daisy chain, as shown in

Figure 3B-2.

Use the other power connector of the

I/O BOARD

THE POWER SUPPLY BOARDS

MBUS-PWR BOARDS

3B-1

KID-64

ND&64

I/O I/O

BOARD

-z-

-zm ?OVW

POWW

BOARD

Figure 3B-2. Medium System

In a system whose expected power draw is beyond 100 W, use multiple MBUS-PWR supplies. Connections for -multiple MBUS-PWR boards utilize the expansion (EXP) connectors, as

shown in Figure 3B-3. These connectors pass the communication signals to the next set of I/O

boards but isolate the power distribution structure. The MBUS-PWR power (PWR)

connectors supply system power to the ribbon cable. Be sure to properly estimate the load of each group of I/O boards, and do not connect the PWR connectors of any two MBUS-PWR

boards.

Y&Y-

3B.2 FEATURES

* Plugs into any MetraBus cable connector * Designed to meet UL, VDE, IEC, and CSA requirements

0 90 to 120 VAC or 180 to 250 VAC versions * AC line filter built-in

Power Status LEDs

Convection cooled

3B.3 SPECIFKZATIONS

Input Voltage:

Input Frequency: 47 to 63 Hz

--XL-

Figure 3B-3. Large System

to 132 VAC

180 to 264 VAC

CRoYUF

Operating Temperature:

Hold up Time:

Output Ratings: 5VDC@15A

MetraBus Cable Type:

3B-2 METRABUS USER MANUAL

0 to 70” C (derate 2.5% per degree over 50” C)

2orns

+15VDC@4A

-15.VDC@l A 50-conductor ribbon cable.

MetraBus Connector:

Status Indicators: +5, +15, -15 V available (green LEDs)

3M 3425-6050

Terminal Blocks:

Output Ground Jumper: Float or utilities ground

+5, +15, -15

V and common

3B.4 INSTALLATION

NOTE: Perform the following procedure only under no-power conditions.

Visually inspect the MBUS-PWR for loose wires, screws, or components.

1. Determine the power distribution configuration and connector utilization.

2. Select an unused MetraBus cable connector and plug the power supply into the cable,

3. making certain that the locking tabs on the connector are locked around the mating portion. The connectors are keyed for your protection. Check the keyways for correct alignment prior to plugging them together. Avoid the use of force with these connectors.

Plug the line cord to a source of power.

Turn on power switch.

3B.5 USE OF OUTPUT GROUND JUMPER

To provide maximum flexibility and minimize ground loops within multiple-supply systems,

MBUS-PWR boards contain an output ground jumper. utilities chassis ground directly to the DC common of each supply. Such a connection in no way affects the chassis ground of the supply itself. system noise by floating all output commons except one-to remove ground loop paths.

3B.6 THE MTAP-I

The MTAP-1 is a power break-out board for the MetraBus system. The board can bring power to the MetraBus from an external supply or can extract power from the MetraBus power supply to support user circuitry. Three LEDs show power supply status.

3B.7 THE MBUS-PWR CONNECTORS

The MBLJS-PWR connectors allow you to split the power distribution in a MetraBus system between multiple power supplies. Using the expansion connector passes the bus and control

signals but isolates the power structure.

If desired, this jumper can connect the

In most cases, you will elect to minimize

THE POWER SUPPLY BOARDS

MBUS-PWR BOARDS 38-3

DATA BUS

CONTROL

A3DRESS

BUS

POWER

til

E m

G is

rsi

L-

CLEAR

WSiRa

- ti

-3

72 w XZ

i w

BUS'I

- +15 v

-15 v

I t5V

+5 v i5 v +5 v +5 v

POWER CONNECTOR

5 6 7

9 i0 11 13 15 16 17 it3 19 21 23 24 25 27 29 3i 32 33 35 37 30 40 4: 43 45 47 48 49 50

Jl. J3

2 4

12 14

20 22

26 28 30

34 36 38

42 44 46

GNC. GND.

GND.

GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GND. GNO. GNC. GND. +5 v -+5v 1

+5 v c5 v c5 v

N-OUT

( POWER

CONTROL /

ADDRESS 1

BUS

F- CLEAR

WSiRB

L- VW

r 2

EXPANSION CONNECTOR PIN-OUT

Figure 38-4. MBUSPWR Connector Pin Assignments

1 2 3 4 5 6 : 7 8 3 70

11 ;2 :

i 4

13 15

32 34

36 38

39 41

42 44

J2, J4

GND. GND. GND. GND. GND. GND.

GND. GND. GND. GNO. GND.

GND. GND.

GND.

GNC.

GND.

3B-4

METRABUS USER MANUAL

MDI-1 G/MSS-16 SOLID STATE SWITCHING I/O SYSTEM

4.1 GENERAL

The MDI-X/M!%16 is a moduIar 2-board system providing complete optical isolation for both high and low power switching applications. Each MDI/MSS-16 monitors and controls 16 individual I/O points via optically isolated solid-state, plug-m modules. A variety of these modules is available for both input and output. Voltages of 120/130 VAC, 0 to 60 VDC, etc. as weU as standard European line voltages may be sensed and controlled. Control and sense modules are also usable on a single MSS16. Screw terminals on the MSS-16 accept 12 to 22 AWG wire.

The MDI-16/M%-16 connects directly to any of the MetraBus controller/driver cards through the MeiraBus cable. You may install MDI-16/M%-16 combination adjacent to its point of use for easy signal connection.

The MetraBus cable carries aII data, address, and status information, and it distributes power on the MetraBus. A tot4 of 20 ground lines interleaved among the data and address lines ensure noise immunity. The MetraBus system allows MetraBus cable lengths of up to 100 feet. Remote control of the MeiraBus system is possible via the REM-64 serial driver card at distances of 1.2 km. The MDI-lGR/MSS-16 is 19” rack-mountable in either a standard NEMA type enclosure or the MetraByte RMT-01. The MDI-16/M%-16 mounts on other flat surface.

Chapter 4

the

driver card in your computer while positioning the

any

flat panel or

A total of 32 MDI-16/M%-16s can connect to a single MeiraBus cable, allowing monitoring and control of up to 512 individual I/O points. Like other MetraBus I/O boards, the MDIX/M%-16 has a data read-back aBowing the user to verify data integrity in date output modes.

For applications requiring more power

power supplies is available. Some common uses of the MDI-16/M%-16 include computer control of Pump Cychng,

ON/OFF Motor Control, Energy Management, Signal Multiplexing, alarm Activation, Temperature Cycling, Product Life Cycle testing, etc.

4.2 FEATURES

Interfaces directly to IBM PC/XT/AT and compatibles

Remote signal connections

Senses/Controls up to 512 I/O points per computer expansion slot

Extremely cost effective

Adapts to your changing requirements

Optically isolated to 1500 VDC (nominal)

THE DIGITAL i/O BOARDS

than

your PC can deliver, a choice of auxiliary

MDI-1 G/MSS-I 6 BOARDS

4 - 1

4.3 SPECIFICATIONS

Number of I/O ChanneIs:

Isolation Type:

Isolation Rating:

I/O Module Life Expectancy:

I/O Modules Installed:

MetraBus Cable Type:

MetraBus Connector:

Environmental

Operating Temperature:

Storage Temperature:

Power Consumption

Physical

+5vDc:

Size:

Optical

4000

Vrms typical Infinite None (must be ordered separately) 50-conductor ribbon. 3M 3425-6050

0 to 70” c

-40 to loa0 c

325

n-4 (typical); 40 mA maximum

14.5 x 3.5 inches (MSS-16)

5.0 x 3.5

inches (MIX-16)

4.4 USING AN AUXILIARY POWER SUPPLY

You may power a single MDI-16/M%-16 from the PC power supply since only +5 VDC is required. However, if you have more than one combination board in your MetraBus system or if you have other MetraBus I/O boards, an auxiliary power supply may be required. See the MBUS-PWR sections of this manual for specifications and installation procedure.

NOTE: If you use an auxiliary power supply in conjunction with an

MlX-64 MetraBus Controller/Driver card, remember to remove Fuse Fl from the MDB-64.

If you use an internal power supply, be certain that the links at each end of the edge connector of the MSS-16 are installed. You may power the MDI-16/M%-16 with an external +5 VDC supply by removing the Links and connecting the supply to the two-position power supply

barrier block on the MSS-16.

4.5 CONFIGURING THE MSS-16

The MSS-16 is a standard PB16A mounting rack for solid-state, I/O plug-m modules. Each MSS-16 wiIl hold up to 16 solid-state I/O modules, which are available in several different versions and may be ordered from Keithley MetraByte or several other manufacturers. When ordering I/O modules from other manufacturers, bear in mind that the MSS-16 uses +5 VDC

4-2 METRABUS USER MANUAL

for module activation. A foIlows.

short

list of the various I/O modules available for the MSS-16

VAC OUTPUT (control)

OAC5 - 120 VAC @ 3 Amps OAC5A - 240 VAC @ 3 Amps OAC5A5 - 120/240 VAC @ 3 Amps (normally closed)

VAC INPUT (sense)

IAC5 - 120 VAC/DC @ 11 mA IAC5A -240 VAC/DC @ 6.5 mA

VDC OUTPUT (control)

ODC5 - 60 VDC @ 3 Amps ODC5A-2OOVDC@lAmp

VDC INPUT (sense)

IDC5-10to32VDC@25mA IDC5B - 4 to 16 VDC @ 45 mA (fast switching)

NOTE:

may open in

The MSS-16 contains 5 A miniature replacement fuses that

the event of external circuit failure.

4.6 INSTALLING THE MDI-16

The MDI-16 adapter board is available in two versions. The difference between versions is the placement of the edge connector. The MDI-16R is a right-angle version of the MDI-16. The MDI-16R was specificaIIy designed to aUow mounting of the two-board combination in a 19” rack mount (a depth of 5” is required). Our RMT-02 is a straight inhne version with an overaIl length (including the MSS-16) of 19 l/4 inches. It is commonly mounted on a flat panel of at least 20” or it may be mounted in 24” racks.

Each MDI-X/M%-16 combination connected to a single MetraBus cable must be set to a unique, non-overlapping MetraBus I/O board address. Each MDI-16 uses 2 of the available 64 MetraBus addresses. These are consecutive locations starting Setting the board address is outlined below (Figure 4-l shows a typical board address switch setting).

Prior to installing the MDI-16/MSS-16, make certain that a MetraBus controller/driver board has been installed. These boards are described in the first section of this manual.

from the

board address.

THE DIGITAL l/O BOARDS

MDI-16/MSS-16 BOARDS

4 - 3

32 I 6 8

Figure 7-l. Setting the Board Address

To set the board address,

1. The board-address DIP switch is located in the lower left comer of every MDI-16. The numbers silk-screened above the switch indicate the value of the switch immediately below it. The numbers have value only in the ON position.

Select an unused board address and turn ON those switches corresponding to the address

that

you

have chosen.

corresponding values of 8 and 16 would be ON while the others would remain OFF. It is important to remember that each MDI-16 must be set to an unused, non-overlapping Board Address in order to avoid address conflicts when being targeted by the driver card.

After

setting

connect the MDI-16 to the MetraBus driver card via the MetraBus cable. The MetraBus

cable connector is keyed for your protection and should plug in easily. Check the

key-ways for correct alignment prior to plugging in the MetraBus cable.

4. If you have only one MDI-16 or if one of your MDI-16s is the last board in your system, you should install the resistor terminating networks that are provided with your driver

card. The sockets marked RN1 and RN2 immediately above the MetraBus connector are for this purpose. These resistor networks are used to minimize signal reflection due to long cable lengths. They are optional, however, and have little effect for cables of 50 feet or less.

the board address, you may connect the MIX-16 to the MSS-16. Then,

For example, in order to set a board address of 24, switches with

4.7 PROGRAMMING THE MDI-16/MSS-16

MDI-16 progr alI necessary control signals are automatically generated within the driver board, the user need not be concerned with control registers, PEEKing or POKEing memory locations, shifting

bits, PUSHing or POPing stacks, learning new languages, or other system level headaches.

Refer to the driver board descriptions provided in Part 1 of this manual.

amming is very simple due to MetraBus supervision by the driver board. Since

Two programs (in BASIC) are included on the MetraBus diskette. In one, MSSlG.BAS loops through and sequentially activates each I/O module while displaying the status of all I/O modules on the CRT su-een. The second program illustrates the BASIC OR command for

4-4 METRABUS USER MANUAL

activating I/O modules while maintaining the status of the present module configuration. The programs link back and forth for easy access. They are heavily commented so that even the beginning programmer should have little, if any, trouble following the flow of logic within. These, in conjunction with the examples below, should answer most of the question

that

arise concerning MIX-16/M%-16 usage.

MDI-16 Terminology & Data Format

Like all MetraBus I/O boards, there is a standard programmin

g sequence that is followed

when controlling the MDI-16/M%-16. This sequence consists of the following:

Targeting the MDI-16 via the ADRPTR.

1. Sending a data value (corresponding to the I/O modules to be accessed) to the DATAIO.

MetraBus treats the 16 modules on the MSS-16 as two @-bit) blocks corresponding to two MetraBus I/O addresses. The data format for each of the two blocks is the same and corresponds to the folio-wiig:

BIT D7 D6 D5

CH7 CH6

CH5

CH4

D3 D2 Dl

CH3

CH2 CHl

CHO

Because of this arrangement, control of the various I/O modules on the board is accomplished by writing a single byte whose value is associated with the modules to be accessed. For

example, to activate module #4 on block 0, write a data value of 16 (24 = 16) to

the

DATAIO.

Similarly, if we wanted to activate modules #3 and #5, we would write a value of 40 (23 + 25 =

40) to the DATAIO. To access module 3 of block 1 (relays 8-151, target block one via the

ADRPTR and write a data vaIue of 8(23 = 8) to the DATAIO. This arrangement

makes

it a very simple matter to specify modules using a BASIC integer variable as shown in the examples below.

The BASIC OUT and lNP commands are used to respectively send information to and receive information from the MetraBus I/O board. While the examples are in BASIC, they are equally applicable to many other computer languages supporting data I/O operations such as C, PASCAL, Assembly, and others. The following examples assume a MetraBus driver card is installed at base address 768 (3OOh) and an MDI-16/M%-16 at board address 20.

Example 1

This example illustrates the use of a BASIC variable to sequentially access each relay on the MSS-16.

lODATA = 768 20ADRPTR = 769 30MSS16 = 20 'Declare MSS-16 Boaxd Address 4OOUT ADRPTR,ESSS16

FOR

600uT DATAIO. 2hI 70NEXT I

THE DIGITAL I/O BOARDS

I= 0 TO 7

‘Declare Data I/O location ‘Declare Address Pointex location

'Point to MSS-16 at address 20 'Begin BASIC control loop 'Sequentially close each relay 'End control loop

MDI-16/MSS-16 BOARDS

4 - 5

Example 2

Reading back the data value sent to the MSS-16 can be very useful for detecting data transmission errors. Such might be the case if you are transmitting data over long distances at high baud rates or if you are in an area of excessive electrical noise. illustrates the data read-back feature. For the sake of clarity, the above program will be used with lines added only as necessary.

The following program

1ODATAIO = &H3OO

ZOADRPTR = 769

30MSS16 = 20

40OUT ADRPTR,MSS16

FOR I= 0 TO 7

6OOUT DATAIO, (2*1)

70RLYCHK=INP(DATAIO)

IF RLYCEX <> (2*1)

100 NEXT I

THEN PRINT "ERROR" :END

'Declare Data I/O location 'Declare Address Pointer location 'Declare MSS-16 Board Address 'Point to HSS-16 at address 20 'BASIC control loop 'Activate "1" relay 'Get data just written

'Data integrity check

'Close control loop

110 END

Example 3

It is often useful to be able to activate a relay while leaving the others intact, regardless of their

state. The most efficient way to do this is to read back the state of all relays then OR those

relays with the new relay to be activated.

lODATA = 768 20ADRPTR = 769

3OKSS16 = 20

4OOuT ADRPTR,MSS16 5OINPuT "NEW RELAY II; RLY

6ORLYSTAT

= INP(DATAI0) 7OOUT DATAIO, (2ARLY) OR RLYSTAT 80GOT0 50

'Declare Data I/O location 'Declare Address Pointer location 'Declare MSS-16 Board Address 'Point to MSS-16 at address 20 'Get user input for new relay 'Read back current status of

'relays

'Activate new relay leaving the

'old ones the way they were

'Loop-back

for

next relay

4-6 METRABUS USER MANUAL

Chapter 5: The Reiay Boards Part 5A

MEM-8 ELECTROMECHANICAL RELAY I/O SYSTEM

5A.l GENERAL

The MEM-8 is an 8-channe1, double-pole, double-throw (DPDT) electromechanical relay board designed for use with the MetraBus industrial data acquisition and control system. As

shipped, the board contains eight electromechanical relays with the silver-button type contacts rated for 100 thousand operations at load (120 VAC/28 VDC at 5 A resistive). The relays are configured with two poles normally open and two poles normally closed when in the OFF state. Unlike solid-state relays, electromechanical relays offer zero-current leakage

when OFF. Since the MEM-8 uses industry-standard R10 type plug-in relays, it accepts

substitutions with other relays having contact ratings of your choice. There are also provisions for relays with other than the standard 5 VDC coils (see the section describing alternative relays). Figure 5A-1 is a block diagram of the MEM-8.

“CO--*”

NC - A

NO - 6 C-B NC - B

COAOS

NO - A C-A

NC - A

NO - B C-B

NC - B

Figure 5A-1. MEM-8 Block Diagram

Screw terminals on the board will accept 12 to 22 AWG wire. The MEM-8 is 19” rackmountable in either a standard NEMA type enclosure or Keithley MetraByte’s R-MT-02 remote enclosure. T’he MEM-8 may also be mounted on any flat panel or other flat surface.

The MEM-8, like other MetraBus output boards, has a data read-back feature allowing the

user to verify data integrity. Each relay on the MEM-8 also has-an annunciator LED associated with it so that visual verification is given when the relay is active. Upon power-up and MetraBus system CLEAR, all relays return to the INACTIVE state.

The MEM-8 connects directly to any of the available MetraBus driver cards via a 50-conductor ribbon cable. This MetraBus cable carries all data, address, and control signals as well as

distributing power on the MetraBus. The MEM-8 may be positioned adjacent to its point of

use (up to 100 feet from the computer) for easy signal connections. Because of its design, the MetraBus system is capable of controlling up to 512 relays (64 MEM-

8s) per computer expansion slot. For those applications requiring greater power than is

available from your computer supply alone, a choice of auxiliary power supplies is available.

THE RELAY BOARDS

MEM-8 BOARD

5A-1

Various relay types may be mixed and matched within the same MEM-8 or the board may be

dedicated to a single relay type making this the most versatile, cost effective relay switching

board available. Uses of the MEM-8 include computer control of pump cycling, ON/OF?? motor control,

energy management, signal multiplexing, alarm activation, temperature cycling, and much

more.

5A.2 SPECIFICATIONS

Relays

Quantity and Type:

8 DPDT

Contact

Material and Type:

Contact Rating:

Operate Time:

Release Tune:

Relay Life Expectancy

Mechanical:

Electrical:

Environmental

Operating Temperature:

Storage Temperature:

Power Consumption

Isolation:

+5vDc:

Silver-cadmium oxide buttons 5 A at 120 VAC (resistive)

5 A at 28 VDC (resistive) 30 ms maximum 10msmaximum

100 miLlion

100 thousand operations (at load) 1000 vnns

0 to 70” C

-40 to 100” C

120 rnA (+180 mA per relay)

operations

Physical

MetraBus Cable type:

MetraBus Connector:

w-2 METRABUS USER MANUAL

Size: 16 x 4.74 inches

Weight:

11.5 oz (326 g-m) 5O-conductor ribbon cable 3M 3425-6050

(40.63 x 12.06 cm)

5A.3 USING AN AUXILIARY POWER SUPPLY

You may power one MEM-8 from the PC power supply, since only +5 VDC is required. However, if you have more

than

one combination board in your MetraBus system or if you

have other MetraBus I/O boards, you may require an auxiliary power supply. See the MBUS-

PWR chapter of this manual for specifications and installation procedure.

NOTE: If an auxiliary power supply is used in conjunction with an MDB-64 MetraBus Controller/Driver card, remember to remove fuse Fl from the MDB-64.

5A.4 SETTING THE MEM-8 BOARD ADDRESS

Each MEM-8 connected to a single MetraBus cable must be set for a unique, non-overlapping MetraBus I/O address if the driver card is to target that specific MEM-8. Setting the board address is outlined below.

Figure 5A-2 shows a typical board address switch Setting.

32 :6

2 3

L. 2

4 5

Figure 5A-2. Setting the Board Address

To set the board address,

The board address DIP switch is located in the lower-left side of the board just above the

1. MetraBus connector. The numbers silk-screened above the switch indicate the value of the switch immediately below it.

Select an unused board address and turn ON those switches corresponding to the address

The numbers have value only in the ON position.

that you have chosen. For example, in order to set a board address of 24, switches with corresponding values of 8 and 16 would be ON while the others would remain OFF. It is important to remember that each MEM-8 must be set to an unused, non-overlapping board address in order to avoid address conflicts when being targeted by the driver card.

After setting the board address, connect the MEM-8 to the MetraBus driver card via the

3. MetraBus cable. The MetraBus cable connector is keyed for your protection and should plug in easily. Check the keyways for correct alignment prior to plugging in the MetraBus cable.

NOTE: It is always good practice to remove power from the MetraBus cable prior to connecting any I/O boards.

If you have only one MEM-8 or if one of your MEM-8s is the last board in your system,

4. you should install the resistor terminating networks that are provided with your driver

THE RELAY BOARDS

MEM-8 BOARD 5A-3

5A.5 PROGRAMMING THE MEM-8

MEM-8 programrnin g is very simple due to MetraBus supervision by the driver board. Since all necessary control signals are automatically generated within the driver board, the user

need not be concerned with control registers, PEEKing or POKEing memory locations, shifting bits, PUSHing or POPing stacks, learning new languages, or other system level headaches. Refer to the driver board destiptions provided in Part 1 of this manual.

Two programs (in BASIC) have been included on the MetraBus diskette. MEM8.BAS loops

through and sequentially activates each relay while displaying the status of all relays on the

CRT screen. The second program illustrates the BASIC OR command for activating relays

while maintaining the status of the present module configuration. The programs are heavily

commented so that even the beginning programmer should have little, if any, trouble

following the flow of logic within. These, in conjunction with the examples below, should answer most of the question that arise concerning MEM-8 usage.

MEM-8 Terminology and Data Format

Like all MetraBus I/O boards, there is a standard programming sequence that is followed

when controlling the MEM-8. This sequence consists of the following:

1. Targeting the MEM-8 via the ADRPTR.

2. Sending a data value (corresponding to the relays to be accessed) to the DATAIO.

MetraBus treats the eight relays on the MEM-8 as a single data byte. The relays, numbered 0 through 7, are associated with MetraBus data control lines as follows:

BIT

CH7

D6 D5 D4 D3 D2 Dl DO

CH6 CH5 CH4 CH3

CH2 CHl

CHO

Because of this arrangement, control of the various I/O modules on the board is accomplished by writing a byte whose value is associated with the relays to be closed. For example, to close relay #4, write a data value of 16 (24=14) to the driver board. Similarly, if we wanted to close

relays #3 and #5, we would write a value of 40 (23 + 25 = 40) to the DATAIO. This arrangement makes it a very simple matter to specify modules using a BASIC integer variable

as shown in the examples below.

The BASIC OUT and INP commands are used to respectively send information to and receive

information from the MetraBus I/O board. While the examples are in BASIC, they are equa.lly

applicable to many other computer languages supporting data I/O operations such as C,

PASCAL, Assembly, and others. The following examples assume a MetraBus driver card is

installed at base address 768 (300h) and an MEM-8 at board address 20.

SA - 4 METRABUS USER MANUAL

Example 1

This example illustrates

the use of a BASIC variable to sequentially access each relay on the

MEM-8.

lODATA = 768

20ADRPTR = 769

30-8 = 20

400UT ADRPTR,=B

50FOR I= 0 TO 7

600UT DATAIO, 2"I

70NEXT I

'Declare Data I/O location 'Declare Address Pointer location

'Declare MEM-8 Board Address

'Point to MEN-8 at address 20 'Begin BASIC control loop 'Sequentially close each relay 'End control loop

Example 2

Reading back the data value sent to the MEM-8 can be very useful for detecting data transmission errors.

Such might be the

high baud rates or if you are in an area of excessive electrical noise. The following program

illustrates the withlinesadded onlyasnecessq.

data read-back feature. For the sake of clarity,

lODATA = &H300 2OADRPTR = 769

3O&E348 = 20 4OOUT ADRPTR,MEZG 50FOR I= 0 TO 7

6OOUT DATAIO, (2AI) 75 RLYCHK=INE'(DATAIO)

80IF RLYCHK <> (2*1)

9ONEXT I

THEN PRINT

95END

case if you are

transmitting

the

above program will be used

data over long distances at

'Declare Data I/O location 'Declare Address Pointer location

'Declare MEM-8 Board Address

'Point to MEN-8 at address 20 ‘BASIC control loop

'Activate "I" relay 'Get data just written

'ERROR' : END

'Data integrity check

'Cl088 control loop

Example 3

It is often state. The most efficient way to do this is to read back the state of all relays then OR those relays with the new relay to be activated.

IODATAIO = 768 20ADRPTR = 769

30=8 = 20 4OOUT ADRPTR,HEM8 50 INPUT "NEW RELAY "; RTJY 60RLYSTAT = INP(DATAI0)

7OOUT DATAIO. (2*RLY) OR RLYSTAT

8OGoTO 50

useful

to be able to activate a relay while leaving the others intact, regardless of their

5A.6 USE OF ALTERNATIVE RELAYS

Since industry standard plug-in relays are used, it is possible to substitute other relays with higherorlowercontactratings,contaact relays, bear in mind that relays with 5 V coils may be driven directly

THE RELAY BOARDS

types,

'Declare Data I/O location

'Declare Address Pointer

'location 'Declare MEM-8 Board Address 'Point to HEM-8 at address 20

'Get user input for new relay 'Read back

'relays 'Activate new relay leaving

'the old ones the way they

were

current status of

'Loop-back for next relay

and

coilvoltages. Whenselectingaltemative

and,

therefore, most cost

MEM-8 BOARD

5A-5

effectiveIy from your computer’s own internal power supply or from our PWR-55 or PWR-100 power supplies. The standard relays supplied with the MEM-8 board have 28 ohm coils and will, therefore, draw about 1.5 A at 5 VDC with all the relays ON. This means that a PWR-100 will drive 7 boards (56 relays) if there is a possibility that all relays will be on at the same tune. Some applications require that you power more than 56 relays without resorting to a heavier supply. In these cases, a “super sensitive” relay may be substituted, e.g. Potter & Brumfield type RlOS-El-Y2-J500. This relay requires only 7 mA to activate the coil. This is less then 1/2Oth the current dram of standard relay coils and allows for as many as 512 relays to be driven from a single PWR-100.

However, it is not always possible to use relays having 5V coils. Such applications are generally confined to either high current (7.5 or 10 A) or where low level (mV) voltages requiring gold crossbar contacts are used. These applications may require

the use

of relays

with 6 V or 12 V coils. Provisions have been made for the addition of a LM-317JX voltage

regulator mounted on a Thermalloy 6254B heat sink. The output voltage from the regulator is

set by Rll and R12, as shown on the

from

the power supply, therefore, an auxiliary supply (PWR-55 and PWR-100) is required.

schematic

diagram provided. The regulator draws +15V

When using the optional regulator, link Wl on the MEM-8 must be removed. Thevoltage regulator and additional components can be installed by the factory.

Contact the factory for

pricing and availability. See Chapter 21. The following list of alternative relays is intended to aid MetraBus users who are not familiar

with the various relay

manufacturers

and their products. As such, it does not constitute an endorsement of any one manufacturer nor of their products. There are certainly many excellent

manufacturers

that are not listed below.

Potter & Brumfield

Super Sensitive RlOS-El-Y2-J500

High Current Contact

RlO-El-X2-V28

Higher Current RlO-El-W2-V185

Low Level RlO-El-PZ-V185

Other suppliers of R10 type relays include

American Zettler - series AZ420 Aromat - series JS2E Allied - series T154 or TX3

n BB

V coil, 2 A contacts)

V coil, 5 A contacts)

(12 V coil, 75 A contacts)

(12

V coil, 150 n-4 contacts)

5A - 6 METRABUS USER MANUAL

Chapter 5: The Relay Boards

MEM=32/A & MEM-32/W ELECTROMECHANICAL RELAY

5B.l GENERAL

The MEM-32/W and MEM-32/A are 32channe1, SPST, relay boards for the MetraBus system. The MEM-32/W has Mercury-wetted contacts rated at 2 A. The wetted contact configuration

of the MEM-32/W allows it to be mounted within +30” of vertical. The MEM-32/A uses Mercury Amalgam relays that have slightly less current capability (0.5 A max.) but can be mounted without regard to relay position. A bIock diagram of the MEM-32 is provided in Figure 5B-1.

Part 5B

SYSTEM

METRABUS

CABLE

METRABUS

CABLE

C INTERFACE 4

BOARD ADDRESS +3

OUTPUTS

OUTPUT

LATCH

BOARD ADDRESS +‘I

OUTPUTS

OUTPUT

LATCH

BOARD ADDRESS +0

OUTPUTS

BOARD ADDRESS t-2

OUTPUTS

Figure 5B-1. MEM-32 Functional Block Diagram

The MEM-32 boards use four consecutive addresses on the MetraBus. This allows control of

up to 16 MEM-32 boards by a single MetraBus driver board providing control of 512

independent relays. The board is divided into four &bit ports. Writing to a port loads data

THE RELAY BOARDS MEM-32/A & MEM-32/W BOARDS 55-l

into the output latches and to the relays themselves. Reading data back from a port returns the data currently on the output latch without changing it. This feature allows the user to verify that data on the outputs

has

been received correctly. The MEM-32 has been designed

so that all relays are set in their off state at power-up. The MEM-32 is connected to the MetraBus system via a 50-conductor ribbon cable that carries

all address, and data signals as well as distributing all power on the MetraBus. The standard MetraBus cable is 10 feet long, and includes connectors for four interface boards. Keithley MetraByte can also build special cabIes up to 100 feet for your application.

Screw terminals on the MEM-32 offer easy connection to user field wiring, and accept wire sizes 12-22 AWG. The screw terminals are detachable for added ease while installing or removing boards. The EM-32 can be mounted in standard 1Pinch racks (such as the RMT-

02) or in standard NEMA enclosures.

5B.2

FEATURES

32 SPST Mercury-wetted contacts (MEM-32/W)

32 SPST Amalgam contacts (MEM-32/A)

Mercury-wetted contacts rated to 2 A at 50 watts (resistive)

Amalgam Contacts rated at 0.5 A at 10 watts (resistive)

Up to 512 outputs per expansion slot

100 VDC Isolation

Very useful for switching in high or low current applications

Allows very dense packaging in control applications

Very low cost per channel

5B.3 SPECIFICATIONS

Number of Outputs: 32 SPST relays

Operation Time:

Isolation:

loo0 VDC

2.0 ms maximum

MEM-32/W Contact Ratings

Contact Type: Mercury-wetted (

Contact Rating:

Contact Resistance:

Contact Life: 107 operations at rated load

58-2 METRABUS USER MANUAL

sition-sensitive, board must be

mounted +30” 0

W at 2 A or 500 VDC (resistive)

vertical)

50 ms2 maximum

MEM-32/A Contact Ratings

Contact Type: Mercury amaIgam

Contact Rating:

Contact Resistance: 50 n-0 maximum

Contact Life:

Environmental

Operating Temperature: 0 to 70” c

Storage Temperature:

Power Consumption

10 W at 0.5 A or 200 VDC maximum

107 operations at rated load

-40 to 100” C

Humidity: 0 to 90% noncondensing

Mounting:

+I5

The MEM-32/W must be mounted within +30* of

vertical. The MEM-32/A can be mounted at any angle

510

v: v:

m4 plus 22 n-4 per activated relay maximum

Not used

5B.4 USING AN AUXILIARY POWER SUPPLY

Because of low power drain, the MEM-32 does not require an auxiliary power supply unless you have more than two MEM-32 boards in your system. However, if you have other MetraBus I/O boards or more than 2 MEM-32s in your MetraBus system, you need a high-

quality auxikuy power supply such as the MBUS-PWR.

NOTE: If an atiiary power supply in used in conjunction with an

MDB-64 MetraBus Controller/Driver card, remember to remove fuse Fl from the MDB-64.

5B.5 SE-I-I-ING THE MEM-32 BOARD ADDRESS

The I/O address for each MEM-32 connected to a single MetraBus cable must be unique and non-overlapping for the driver card to target that specific MEM-32. These addresses allow the boards in a MetraBus system to be operated independently. Each MEM-32 uses four of the

available 64 MetraBus addresses. These four addresses run consecutively starting from the MEM-32 board address. Setting the board address is outlined below. Figure 5B-2 shows a typical board address switch Setting.

THE RELAY BOARDS

MEM-32/A & MEM-32/W BOARDS 58-3

32 16 8 4

SETTINGS ARE FOR

BOARD ADDRESS 20

Figure 58-2. Setting the Board Address

To set the board address,

1. The board-address DIP switch is on the far-left side of the board just above and to the left of the MetraBus connector. The numbers silk-screened above the DIP switch indicate the values of the corresponding individual switches; these numbers have value only in the ON position.

2. Select an unused board address and set the DIP switch accordingly. For example, in order to set a board address of 24, switches with corresponding values of 8 and 16 would be ON while the others would remain OFF. Remember that

each MEM-32

uses four consecutive addresses of the 64 that are available and must be set to an unused, non-overlapping address order to avoid conflicts.

3. After setting the board address, connect the MEM-32 to the MetraBus driver card via the MetraBus cable. The MetraBus cable connector is keyed for your protection and should plug in easily. Check the keyways for correct alignment prior to plugging in the MetraBus cable.

NOTE: It is always good practice to remove power from the

MetraBus cable prior to connecting any I/O boards.

4. If you have only one MEM-32 or if your MEM-32 is the last board in your system, install the resistor-terminating networks provided

with

RN1 and RN2 immediately above the MetraBus connector are for this purpose. These resistor networks mmimiz. e signal reflection caused by long cable lengths. They are optional, however, and have little effect for cables of 50 feet or less.

58.6 TYPICAL OUTPUT CONNECTIONS

The MEM-32 was designed to interface with a variety of devices. Figure 5B-3 depicts typical output connections.

5B.7 PROGRAMMING THE MEM-32

MetraBus supervision by the driver board simplifies MEM-32 programming. Since all necessary control signals are automatically generated within the driver board, the user need

not be concerned with control registers, PEEKing or POKEing memory locations, shifting bits, PLJSHing or POPing stacks, learning new languages, or other the driver board descriptions in this manual.

your driver card. The sockets marked

system

level headaches. Refer to

58-4

METRABUS USER MANUAL

C)+-J - - - - - -

INPUT 0

CHO

TO INPUT

CHi __-..__-

(-Jp - - - - - -

(-x3 - - - . - - -

INPUT 1

INPUT 2

INPUT 3

INPUT 4

TO A/O BOARD

INVERTING

OUTPUTS

NON-INVERTING

OUTPUTS

CHo ( ;Lc1- TO INPUT

Figure 5B-3. Typkxl Output Connections

A program (in BASIC) is included on the MetraBus diskette. The program deals with the MEM-32 and its associated functions. MEM32.BAS displays the status of all 32 output bits and allows you to change any bit using the cursor keys (, , , ).

This program is heavily commented so that even the beginning programmer should have little, if any, trouble following the flow of logic within. These, in conjunction with the examples below, should answer most of the question that arise concerning MEM-32 usage.

MEM-32 Terminology & Data Format

Like all MetraBus I/O boards, there is a standard programming sequence that is followed when controlling the MEM-32. This sequence consists of the following:

Targeting the MEM-32 and the &bit block desired via the ADRPTR.

1. Sending a data value (corresponding to the desired state of the outputs) to the DATAIO.

The MEM-32 has four blocks (numbered O-3) of eight channels (numbered O-7). In order to select block number 2, you must specify that block when targeting the MEM-32 at its Base Address as follows:

lOOUT ADRPTR, KEM32 + 2

The BASIC OUT and INF’ commands send instructions to and retrieve data from the lvfEM-32.

THE RELAY BOARDS

'point to block 2 of m-32

MEM-32/A & MEM-32NV BOARDS

58-5

lODATAI0 = 768

ZOADRPTR = 769 3OMEH32 = 4

40 OUT ADRPTR, MEM32 50OUT DATAIO, 63

Example 1

'Declare Data

'Declare Address

'Declare

HEM-32 MetraBus address

I/O location

Pointer location

'Point to block 0 of MEM-32

'Set

the lowest

6-bits (0011 1111)

The above example sets

(ON

then OFF) each of the 32 bits

Bits 0, 1,2,3,4, and 5 to their active states. To sequentially toggle

of the MEM-32, use nested BASIC FOR . . . NEXT loops as

follows:

lODATA = 768 20ADRPTR = 769

3OME!M32 = 4

40FOR I = 0 TO 3

5OOTJT ADRPTR, MI032 + I

60FOR J = 0 TO 7 7OOUT

DATAIO, 2*Y

80NBXT J 90NEXTI

'Declare Data I/O location 'Declare Address Pointer location 'Declare W-32 Board Address 'Set up block access control loop 'Point to block "1" of m-32 'Channel access control loop

'Set each bit sequentially high 'Increment 'Increment block.

channel variable and loop

Loop

back to 40

Example 2

It can be useful to be able to turn certain output bits ON while leaving the other output bits in their present state. Do this with the BASIC OR comman

1ODATAIO = 768 20ADRPTR = 769 3OMEB32 = 4 4OOUT ADRPTR,MBM32 + 4

5OINPUT "Bit number ON

60OLDBITS=INP(DATAIO) 7OOUT DATAIO, 2,'BIT OR

SOGOT 60

; BIT 'Get user input (bit number)

OLDBITS 'OR new bit with old

'Declare Data I/O location 'Declare 'Declare MEM-32 Board Address 'Point to block 4 of MBM-32

'Retrieve present status 'Loop back

d as follows:

Address

for

next bit

Pointer location

As shown above, the MEM-32 has data read-back capability allowing for data integrity verification. This lets the user read-back the data just sent to the MEM-32 and compare it to

thedatavaluespecified.

In order to verify data via the data read-back feature, We will use the above program with changes Qines 10 to 50 remain the same as above).

6OOuT DATAIO, 2ABIT

70BITCBEK

= INP(DATAI0) 'Get data just sent 80 IF BITCBER <> 2*BIT THEN PRINT "ERROR! !": END 90GOTO 50

Note that in all the above examples, we used a variable to set various bits to the specified

states. Calculatingtheintegerthatrepresentsvariousbitsis a simplematterasshownbelow.

Bitcalculationsarebased on binaryarithmetic (base21 asfollows:

5B-6 METRABUS USER MANUAL

the

following program will be helpful.

'Turn ON targeted bits

Therefore, to set bits 4 and 7 ON, we would output a data value of 144 to the DATAIO, after

we had targeted the MEM-32.

4OOUT ADRPTR, MEM32 + 1 ‘Point to block 1 of MJZM-32 5OOUT DATAIO, 144 ‘Set bits 4 and 7 high

Use this procedure for each block of eight bits being monitored. That is, calculation of digital

output

line values

not

correspond to lines 0 - 32, but simply 0 - 7.

58.8 USING COMPILED OR ASSEMBLED LANGUAGES

Program execution speed of compiled and

a few precautions. A WRIIE DATA (R/W!

monitoring of the K/W attempting other

and BUSY status bits prior to accessing the digitized data or

operations on the MetraBus. This monitoring operation

assembled languages is such that their use

&me of 10 microseconds necessitates the

can

be accomplished

requires

by reading the currently latched MetraBus address and “looking” at bit #6. This information is contained in the ADRPTR location. The data storage format is:

BIT D7 D6 D5

BUSY

FUW A5

D4 D3

A4 A3

D2 Dl

A2 Al

For a period of 10 microseconds after a data output (WRITE) operation, the R/W status bit will be active (high). The R/W status bit must be in its quiescent state prior to

attempting

another operation on the MetraBus. Returning the value of only the R/W bit can be accomplished as follows:

90 STATUS=INP (ADRPTR) AND 64 100 IF STATUS <> THEN GOT0 90

‘Get status

information

The BASIC variable STATUS will contain either 0 or 64 indicating the state of the D6 bit. Again, it should be stressed that this procedure need only be done when using compiled (including compiled BASIC) and assembled languages.

THE RELAY BOARDS

n BB

MEM-32/A & MEM-32/W BOARDS

58-7

58-8 METRABUS USER MANUAL

Chapter 5: The Relay Boards

MSSR-32 SOLID STATE SWITCHING I/O MODULE

X.1 GENERAL

The MSSR-32 is a 32-channel digital I/O module providing complete optical isolation for both high and low power switching applications. This module monitors and controls 32 individual I/O points via optically isolated, solid-state, plug-in modules. The 32 digital channels perform as four B-bit I/O ports for easy programming. These modules are available for both input and output. Voltages of 120/130 VAC, 0 to 60 VDC, 10 to 32 VDC, etc. as well as standard European line voltages can be sensed and/or controlled. can be mixed on a single MSSR-32. Removable screw terminals on the MSSR-32 accept 12 to 22 AWG wire. A functional block diagram of the MSSR-32 is provided in Figure 5C-1.

Pat? 5C

Control and sense modules

METRABUS

CABLE

B CONTROL

Figure 5G7. MSSR-32 Block Diagram

The MSSR-32 connects directly to one of the MetraBus controller/driver cards (MDB-64, MID64, pCMDR-64, or REM-641 through the MetraBus cable. The driver card is in your PC, while the MSSR-32 may be adjacent to its point of use for easy signal connection.

The MetraBus cable connects the MSSR-32 to the driver card and carries all data, address, and status information as well as distributing power on the.MetraBus. A total of 20 ground lines are interleaved among the data and address lines to ensure system noise immunity. The MetraBus system allows MetraBus cable lengths of up to 100 feet. The MSSR-32 is 19” rackmountable in any standard NEMA type enclosure and also mounts on any panel or other flat

surface. A total of 16 MSSR-32s can connect to a single MetraBus driver card via the MetraBus cable,

allowing up to 512 individual I/O points for monitor and control. Like other MetraBus I/O

boards, the MSSR-32 has a data readback feature allowing user verification of data integrity.

For those applications requiring greater power than your PC supply normally furnishes, a choice of auxiliary MetraBus power supplies is available (MBUS-PWR).

THE RELAY BOARDS

MSSR-32 MODULE

5c-1

The MSSR-32 is a versatile, cost-effective solution to many industrial and laboratory applications including: computer control of pump cycling, ON/OFF motor control, energy management, signal multiplexing, testing, etc.

5C.2 FEATURES

Interfaces directly to IBM PC/XT, PC AT, and compatibles

Remote connections with removable screw terminals

Sense/control up to 512 I/O points per computer expansion slot

Extremely cost effective

Adapts to your changing requirements

Optically isolated to 1500 VDC (nominal)

Uses Industry Standard plug-in modules

alarm activation,

temperature cycling, product life cycle

x.3

SPECIFICATIONS

Number of I/O Channels:

Isolation Type: Optical

Isolation Rating:

I/O Module Life Expectancy:

I/O Modules Installed: None (must be ordered separately)

MetraBus Cable Type:

MetraBus Connector: 3M 3425-6050

Environmental

Operating Temperature:

Storage Temperature:

Power Consumption

+5 VDC:

1500 Vi-n-6 typical Infinite

5Konductor Ribbon

to 70’ C

-40 to loo0 c.

325

mA typical; 500 mA maximum

5C.4 USE OF AN AUXILIARY POWER SUPPLY

The PC power supply can power a single MSSR-32 since the Board requires only +5 VDC (@

5c-2

500 mA, max>.

MetraBus system or if you have other MetraBus I/O boards, an auxiliary power supply may be required. See the MBTJS-PWR section of this manual for more information.

METRABUS USER MANUAL

However, if you are installing more than one MSSR-32 board in your

NOTE: If you are using an auxiliary power supply in conjunction with an MDB-64 MetraBus controller/driver board, remember to remove fuse Fl from the MDB-64.

5C.5 CONFIGURING THE MSSR-32

The MSSR-32 is a mounting rack for solid-state, I/O plug-in modules. Each MSSR-32 will hold up to 32 solid-state I/O modules that are available in several versions and may be ordered from the factory or other sources. When ordering I/O modules from other manufacturers, bear in mind that the MSSR-32 uses +5 WC for module activation. A short list of the various I/O modules available for the MSSR-32 follows:

OUTPUT (control)

SMOAC5 - 120 VAC @ 3 A SMODC5 - 0 to 60 WC

INPUT

SM-IAC5 - 120 VAC/DC @ I1 mA SM-IDC5 - IO to 30 WC

NOTE: The MSSR-32 contains 5 A miniature replacement fuses that

may

open in the event of external circuit failure.

5C.6 INSTALLING THE MSSR-32

Each MSSR-32 connected to a single MetraBus driver card must be set to a unique, nonoverlapping MetraBus I/O board address. Each MSSR-32 uses four of the available 64 MetraBus addresses. These are consecutive locations starting from the board address. Setting this board address is outlined below. Figure 5C-2 shows a typical board-address switch setting.

2 3 4

Figure 5C-2. Typical Board Address Switch Setting

To set the board address,

1. The board address DIP switch is located in the lower-left corner of the MSSR-32. The numbers silk-screened above the DIE indicate the values of the switches immediately below them. The numbers have value only in the ON position.

SEllINGS ARE FOR

BOARD ADDRESS 20

THE REL4Y BOARDS

MSSR-32 MODULE

w-3

2. Select an unused board address and turn ON the corresponding DIP switches. For example, to set a board address of 24, turn on the switches for values 8 and 16. Remember to choose an unused, non-overlapping board address to avoid conflicts.

3. After setting the board address, you may connect the MSSR-32 to the MetraBus driver card via the MetraBus cable. The MetraBus cable connector is keyed for your protection and should plug in easily. Check the key-ways for correct alignment prior to plugging in

the MetraBus cable.

If you have only one MSSR-32 or if one of your MSSR-32s is the last board in your system, install the resistor terminating networks provided with your driver card. The sockets marked RN1 and RN2 immediately above the MelraBus connector are for this purpose. These resistor networks minimiz e signal reflection caused by long cable lengths. They are optional, however, and have little effect for cables of 50 feet or less.

MSSR-32 Terminology and Data Format

Follow a standard programming sequence when controlling the MSSR-32/MSSR-32. This sequence consists of the following:

1. Targeting the MSSR-32 and desired 8-bit block via the ADRMR.

2. Sending a data value (corresponding to the I/O modules to be accessed) to the DATAIO.

MetraBus treats the 32 modules on the MSSR-32 as four @-bit) blocks corresponding to 4 MetraBus I/O addresses (board address +0 through board address +3). The data format for each of the two blocks is the same and corresponds to the following digital I/O lines (DO-D7):

BIT D7 D6 D5

CH7 CH6 CH.5 CH4 CH3

D3 D2

CH2 CHl

CHO

This arrangement enables control of I/O modules on the board to be accomplished by writing a single byte whose value is associated with the modules to be accessed. For example, to activate module 4 on block 0, write a data value of 16 (24 = 16) to the DATAIO. Similarly, to activate modules 3 and 5, write a value of 40 (23 + 25 = 40) to the DATAIO. To access module 3 of block 1 (relays 8 to 15), target block one via the ADRPTR (base address +l) and write a data value of 8 (23 = 8) to the DATAIO. This arrangement allows you to specify modules using a BASIC integer variable as shown in the examples below.

The BASIC OUT and INP commands respectively send information to and receive information from the MetraBus I/O board. While the examples are in BASIC, they are equally applicable to many other computer languages supporting data I/O operations such as C, PASCAL, Assembly, and others. The following examples assume a MetraBus driver card is installed at base address 768 (3OOh) and an MSSR-32 at board address 20.

x-4

METRABUS USER MANUAL

Example 1

This example illustrates the use of a BASIC variable to sequentially access each relay on the MSSR-32.

lODATA = 768 2OADRPTR = 769 30MSSR32 = 20

40FOR J = 0 TO 3

5OOUT ADRPTR,MSSR32 + J 60 FOR I= 0 TO 7 7OOUT DATAIO, 2"I 80NBXT I 90NEXT J

'Declare Data I/O location 'Declare Address Pointer location ‘Declare MSSR-32 Board Address 'J represents the various 8-bit blocks 'Point to MSSR-32 at address 20 'Begin BASIC control loop 'Sequentially close each relay 'End first block 'End control loop

Example 2

Readingbackthedatavaluesent to the MSSR-32 canbeusefulfordetectingdatatransmission errors if you are transmitting data over long distances at high baud rates or if you are in an area of excessive electrical noise. The following program illustrates the data readback feature. For the sake of clarity, the above program will be used with lines added only as necessary.

DATAIO = &H300

ADRPTR = 769

MSSR32 = 20

FOR J = 0 TO 3

OUT ADRPTR,MSSR32

FOR I= 0 To 7

OUT DATAIO, (2*1)

RLYCHK=INP(DATAIO) IF RLYCHK <> (2AI)

90 100

NEXT I

110 120

NEXTJ

128

IF J>3 THEN END

THEN PRINT "ERROR"

'Declare Data I/O location 'Declare Addxess Pointer location 'Declare MSSR-32 Board Address 'J represents the various 8-bit blocks 'Point to MSSR-32 at address 20 'BASIC control loop 'Activate "1" relay 'Get data just written

:END 'Data integrity check 'Close control loop

Example 3

It can be useful to be able to activate a relay while leaving the others intact, regardless of their state. The most efficient way to do this is to read back the state of all relays then OR those relays with the new relay to be activated.

10DATAIO = 768 'Declare Data I/O location 20ADRPTR = 769 30MSSR32 = 20 'Declare MSSR-32 Board Address 40OUT ADRPTR,MSSR32 'Point to MSSR-32 at address 20

50 INPUT "NEW RELAY "; RLY 'Get user input for new relay

60RLYSTAT = INP(DATAI0) 'Read back current status of relays 7OOUl' DATAIO, (aARLY) OR RLYSTAT 71 'Activate new relay leaving the old

80GCTO 50

THE RELAY BOARDS

'Declare Address Pointer location

'ones the way they

'Loopback for next relay

MSSR-32 MODULE Z-5

were

Z-6

METRABUS USER MANUAL

Chapter 5: The Relay Boards

MCPT-8X8 CROSS-POINT, MATRIX RELAY BOARD

5D.l GENERAL

The MCPT-8X8 features 64 I/O relay points in an 8 x 8 array. The relays are single-pole, form A, mercury amalgam, non-position sensitive contact reed type. As an option, positionsensitive wetted relays are available. Figure 5D-1

SWITCH 1

READ/WRITE

LOGIC

shows

a block diagram of the MCPT4X8.

MCPT-8X8 CROSS-POINT SWITCH

I I I I I I I I

X6 x5

x4 x3 x2

X REGISTER

Part 5D

Xl x0

11 I

The MCPT-8X8 is programmable in any language with I/O control such as C, Assembly, Microsoft Pascal, TURBO PASCAL, GWBASIC, or BASICA. The relays are mapped to an X/Y (consecutive byte) Cartesian matrix for ease of configuration and control. The MCPT-8x8 uses 2

consecutive

MCPT-8x8 boards (2048 I/O points) from a single MetraBus controller board. Also, any number of boards may be assigned the same board address providing 2,3,or N pole switches, making it possible to expand relay matrices in a linear (1 dimension), Cartesian (2 dimensions), or

dimensional input and control schemes.

THE RELAY BOARDS

METRABUS

addresses

geometric

X FEEDBACK

I I

II I

Figure 5D-I. MCPT-8X8 Functional BIock Diagram

on the

MetraBus allowing a maximum of

(3 dimensions)

fashion.

This allows the creation of versatile, multi-

separately addressable

MCPT-8X8 BOARD

5D - 1

The MCPT-8x8 connects to the MetraBus via a 50-conductor ribbon cable and connector (3M Part # 3425-6050) carrying all address, data, and control signals from the controller/driver and distributing power on the MetraBus. Removable screw terminals on the MCPT-8x8 offer easy signal connection and interchange.

5D.2 SPECIFICATIONS

Relay Specifications

Number of I/O points: 64 (8 x 8 matrix)

Contact Power Rating:

Contact

Operate and Release Time:

Environmental

Operating Temperature:

Storage Temperature:

Power Supplies

Type of Relay:

Contact Type:

Resistance: 50 mQ minimum

Relay Life:

Humidity:

@ +5

Volts:

Single-pole, Form A, reed type Mercury amalgam (not position-sensitive);

Optional-wetted mercury (position-sensitive)

200 VDC @ 0.5

>10,000,000 operations at full load 2 ms maximum

+32

to +122’ F (0 to +50” C)

-104 to +212’ F (-40 to +lOO’ C) 0 to 95%, noncondensing

+5VlX@2OOmA

energized relay.

A maximum

maximum plus 20 mA per

Physical

4.75”

Size:

Weight:

MetraBus Cable Type:

MetraBus Connector: 3M 3425-6050.

H x 16.00” L (12.06 cm H x 40.64 cm L).

20 ounces (566.00 g-m).

5O-conductor ribbon cable.

5D.3 USE OF AN AUXILIARY POWER SUPPLY

If you have more than one Mcl’T-8~8 or other MetraBus I/O boards in your MetraBus system, or you do not wish to use the PC +5 V power, you may require an auxiliary power

5D-2

supply. Refer to the MBUS-PWR chapter for more

METRABUS USER MANUAL

information.

NOTE: When using an auxiliary power supply with an MDB-64 MetraBus controller/driver board, remember to remove fuse Fl from the MDB-64.

5D.4 JUMPERS AND SWITCHES

This section describes how to configure the MCFT-8x8. One DIF switch (9) sets the board address, and one jumper block (Jl) selects the read-data feature.

Setting the Board Address

Set each MCFT-8x8 on a single MetraBus cable for a unique, non-overlapping MetraBus I/O address, unless using multiple boards as two of n pole switches. This distinct address allows the various boards in a MetraBus system to operate independently. Each MCPT-8x8 uses two of the 64 available addresses on the MetraBus.

NOTE: The MCPT-8x8 uses two of the 64 consecutive addresses on the MetraBus. The MCM’-8x8, like all Me&aBus I/O boards, requires a non-overlapping address in order to avoid address conflicts. Since any MetraBus I/O board may be connect to a single MetraBus cable, an address overlap is possible. Take care to avoid this.

To configure the board address, locate switch Sl on the board. This switch allows you to set

board addresses ranging from 2 to 62. Sl is illustrated in Figure 5D-2.

16 8

4 2

Figure 50-2. Switch Sl

To set the board address,

position. For example, to set a board address of 24, move switches 2 and 3 into the ON position as shown in Figure 5D-2.

Setting the Read Data Jumper

move

the appropriate combination of Sl switches into the ON

Jumper J6 permits the read-data feature of the MCFT-8x8 to be suppressed. This jumper is normally factory-configured to allow data to be read (in its OFF position). Some system

configurations assigned the same board address are installed in a multi-pole switch configuration (this

THE RELAY BOARDS

may

require this feature to be disabled. For example, if multiple boards

MCPT-8X8 BOARD

5D-3

configuration helps to avoid data conflict). To disable this function, move the jumper plug to the ON position (between posts 1 and 2). Figure 5D-3 shows the read-data jumper.

Figure 50-3.

If multiple boards use the same MetraBus address (they are in a multi-pole configuration), only one read-data jumper should be ON. That is,the Read Data Jumper on one board should be in the ON position. Read-data jumpers on all other boards should be in the OFF position.

Read Data Jumper Block (J6)

OFF

5D.5 RESISTOR TERMINATION NETWORKS

If the MCPT-8X8 is the last board on the MetraBus network, you may need to install the two

resistor termination networks provided with the MetraBus controller board (refer to the

section describing your controller board for more information). These networks are installed

in sockets RN1 and RN2.

SD.6 INSTALLING THE MCPT-8X8

Before installing the MCPT-8X8, make certain that a MetraBus controller/driver board has been installed. To install the board,

1. Select an unused board address and set Sl accordingly. Remember that each MCPT-8X8 uses eight of the 64 MetraBus I/O addresses and must be set to an unused, nonoverlapping board address to avoid address conflicts.

2. After setting the board address, connect the MCPT-8X8 to the MetraBus cable. The MetraBus cable connector is keyed for your protection,

NOTE: it to any I/O boards.

3. If you have only one MCPT-8X8 or if your MCPT-8X8 is the last board in your system, install the resistor terminating networks provided with your driver card. The sockets marked RN1 and RN2 immediately above the MetraBus connector are for this purpose. These resistor networks minimiz e signal reflection from long cable lengths. They are optional, however, and have little effect for cables of 50 feet or less.

Remove power from the MetraBus cable prior to connecting

5D.7 PROGRAMMING THE MCPT-8X8

Since the driver board generates all control signals, there.is no need for concern with control registers, PEEKing or POKEing memory locations, shifting bits, PUSHing or POPing stacks, learning new languages, or other system level headaches.

5D-4

METRABUS USER MANUAL

Keithley Metrabus User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual