Measurement Digital HS User Manual

Digital HS

User’s Manual

IOtech, Inc.

25971 Cannon Road

Cleveland, OH 44146

Phone: [phone]

Fax: [phone]

E-mail: [e-mail]

Internet: http://www.iotech.com

Digital HS

User’s Manual

p/n

Digital HS - 901

© 1998 by IOtech, Inc. — Printed in the United States of America

Warranty

Your IOtech warranty is as stated on the product warranty card. You may contact IOtech by
phone, fax machine, or e-mail in regard to warranty-related issues.
Phone: [phone], fax: [phone], email:

[e-mail]

Limitation of Liability

IOtech, Inc. cannot be held liable for any damages resulting from the use or misuse of this
product.

Copyright, Trademark, and Licensing Notic e

All IOtech documentation, software, and hardware are copyright with all rights reserved. No
part of this product may be copied, reproduced or transmitted by any mechanical,
photographic, electronic, or other method without IOtech’s prior written consent. IOtech
product names are trademarked; other product names, as applicable, are trademarks of their
respective holders. All supplied IOtech software (including miscellaneous support files,
drivers, and sample programs) may only be used on one installation. You may make archival
backup copies.

FCC Statement

IOtech devices emit radio frequency energy in levels compliant with Federal Communications
Commission rules (Part 15) for Class A devices. If necessary, refer to the FCC booklet How To Identify
and Resolve Radio-TV Interference Problems (stock # 004-000-00345-4) which is available from the
U.S. Government Printing Office, Washington, D.C. 20402.

CE Notice

Many IOtech products carry the CE marker indicating they comply with the safety and emissions
standards of the European Community. As applicable, we ship these products with a Declaration of
Conformity stating which specifications and operating conditions apply.

Warnings and Cautions

Refer all service to qualified personnel. This caution symbol warns of possible personal injury or
equipment damage under noted conditions. Follow all safety standards of professional practice and the
recommendations in this manual. Using this equipment in ways other than described in this manual can
present serious safety hazards or cause equipment damage.

This warning symbol is used in this manual or on the equipment to warn of possible injury or death from
electrical shock under noted conditions.

This ESD caution symbol urges proper handling of equipment or components sensitive to damage from
electrostatic discharge. Proper handling guidelines include the use of grounded anti-static mats and wrist
straps, ESD-protective bags and cartons, and related procedures.

Specifications and Calibration

Specifications are subject to change without notice. Significant changes will be
addressed in an addendum or revision to the manual.

hardware products to published specifications. Periodic hardware calibration is not covered
under the warranty and must be performed by qualified personnel as specified in this manual.
Improper calibration procedures may void the warranty.

As applicable, IOtech calibrates its

Quality Notice

IOtech has maintained ISO 9001 certification since 1996. Prior to shipment, we thoroughly test our
products and review our documentation to assure the highest quality in all aspects. In a spirit of
continuous improvement, IOtech welcomes your suggestions.

Introduction

1.1 General Description

The Digital488HS/32 is a high speed IEEE 488 to digital I/O interface providing the
fastest possible communication between the IEEE 488 bus and 34 TTL compatible
digital I/O lines (17 inputs and 17 outputs). Both the input lines and the output lines
have an associated pai r of h ands hak e lin es. Th e Data Avai lab le (iDAV an d oDAV fo r
input and output respectively) line is driven by the data source to indicate that the
receiver should accept new data. The Busy (iBusy and oBusy for input and output
respectively) line is driven by the receiver to indicate that the source should not send
new data. Each handshake line is switch selectable for either active high or active low
operation.

The input and output ports are separated into one 8-bit (first byte) port and one 9-bit
(second byte) port. There are two separate switch selectable operating modes for both
the input and output data ports, 8-bit and 16-bit. In the 8-bit mode, 8-bit data are
transferred to or from the second byte port with the IEEE 488 bus control line EOI as
the 9th bit. In the 16-bit mode, the first eight bits of data are transferred to or from the
first byte port followed by the next eight bits with EOI to or from the second byte
port. The user connects the external I/O device to correspond to the desired byte
ordering (most significant byte first or least significant byte first). Both input and
output ports are separately switch selectable for either active high or active low
output data operation.

The output port provides switch selection for each bit of high or low on power-on,
reset, or clear.

There are two switch enabled conditions for which the Digital488HS/32 can request
service with SRQs: Output Port Empty and Input Port Full. This status can also
determined by Parallel Poll via switch selectable responses.

Some of the control lines available are:

oClear This output line provides an active 1µSec pulse upon

detection of the IEEE 488 multiline commands DCL and
SDC. This control line is switch selectable for either active
high or active low operation.

oTrigger This output line provides an active 1µSec pulse upon

detection of the IEEE 488 multiline command GET. This
control line is switch selectable for either active high or
active low operation.

/oReset This output line provides an active low signal for

approximately 100msec at power on and for the duration
of the time /iReset is active plus approximately 100msec.

/iReset This input line provides an external method to power-on

cycle the Digital488HS/32. When this line is low, the
/oReset line also becomes active low.

SB1 Serial Poll Bit #1. An external input to the

Digital488HS/32 serial poll register which can be read via
IEEE 488 serial polls. This condition may also be switch
selected to generate an SRQ on the IEEE 488 bus.

SB2 Serial Poll Bit #2. An external input to the

Digital488HS/32 serial poll register which can be read via
IEEE 488 serial polls. This condition may also be switch
selected to generate an SRQ on the IEEE 488 bus.

/OE The output buffers on the digital output port are placed in

tri-state when this line is in an inactive (high) state. This
allows use of the Digital488HS/32 as a bidirectional
interface, connecting the input and output port data lines
together.

1.2 Available Accessories

Additional accessories that can be ordered for the Digital488HS/32 include:

CA-7-1 1.5 foot IEEE 488 cable
CA-7-3 6 foot shielded IEEE 488 cable
CA-7-4 6 foot reverse entry IEEE 488 cable
CN-20 Right angle IEEE 488 adapter, male and female
CN-22 IEEE 488 multi-tap bus strip, four female connectors

in parallel

CN-23 IEEE 488 panel mount feed-through connector, male

and female

DigitalHS-901 Additional Instruction Manual

1.3 Specifications

Digital I/O Capability:

included are two output and two input data handshake lines, two status bit lines, clear output, trigger
output, reset input, input END of data and output END of data lines.

Logic Levels:

Output :

Input:

Logic Sense:

VOH = 2 volts min @ IOH = -15 mA ; 3.4 volts typ @ IOH = -3 mA
V
V
VIL = 0.8 volts max
IIH = 0.02 mA max @ VIN = 2.7 volts (Data Input Lines)
IIL = -0.20 mA max @ VIN = 0.4 volts (Data Input Lines)
IIL = -0.50 mA max @ VIN = 0.4 volts (Control & Handshake Input Lines)
IIH = -0.30 mA max @ VIN = 2.7 volts (Control & Handshake Input Lines)
Switch selectable power on and Device Clear (DCL & SDC) levels on output
data lines. Switch selectable logic inversion for input data port, output data port,
input handshake lines, output handshake lines, END lines, trigger and clear lines.

*

16-bit TTL compatible inputs, 16-bit TTL compatible outputs. Also

= 0.5 volts max @ IOL = 24 mA ; 0.4 volts MAX @ IOL = 12 mA

OL

= 2 volts min

IH

IEEE 488.1 Specification Subsets:

SH1, AH1, T6, TE0, L3, LE0, SR1, PP2, RL0, DC1, DT1, C0, E2

DIO Drivers: Tri-State drivers are used on all DIO lines except during PPAS

(Parallel Poll Active State) when open collector drivers are used.

Connector: Standard IEEE 488.1 connector with metric studs.
Data Transfer Speed: 1,000,000 bytes/sec (handshake lines connected externally

together)

SRQ: Switch selectable SRQs on Input Port Full, Output Port Empty, External

Service Bit #1 and External Service Bit #2.

Parallel Poll: Switch selectable response on Input Port Full and Output Port Empty.

General

Indicators: LEDs for Talk, Listen, SRQ, Input Port Full, Output Port Empty and Power.
Power: 105-125V or 210-250v, 50/60 Hz; 60 VA max
Environment: 0 to 50°C; 0 to 70% RH to 35°C. Linearly derate RH 3%/°C from 35° to 50°C
Dimensions: 425mm wide x 45 mm high x 203 mm deep (16.75" x 1.75" x 8")
Weight: 4.5 kg (10 lbs)
Controls: Power switch, external switch for IEEE 488 bus address, internal switches for

output data power on levels, SRQ and ist enable, output data logic sense, input
data
logic sense and logic sense for Trigger, Clear, handshake and END lines.

Supplied Accessories: Two (2) mating solder-tab I/O connectors, power cord, manual and

rack mount kit.

*Specifications Subject to Change Without Notice

*

1.4 Abbreviations

The following IEEE 488 abbreviations may be used throughout this manual.

addr n IEEE bus address "n"
ATN Attention line
CA Controller Active
CR Carriage Return
data Data String
DCL Device Clear
GET Group Execute Trigger
GTL Go To Local
LA Listener Active
LAG Listen Address Group
LF Line Feed
LLO Local Lock Out
MLA My Listen Address
MTA My Talk Address
PPC Parallel Poll Configure
PPU Parallel Poll Unconfigure
SC System Controller
SDC Selected Device Clear
SPD Serial Poll Disable
SPE Serial Poll Enable
SRQ Service Request
TA Talker Active
TAD Talker Address
TCT Take Control
term Terminator
UNL Unlisten
UNT Untalk
* Unasserted

Getting Started

2.1 Inspection

The Digital488HS/32 was carefully inspected, both mechanically and electrically,
prior to shipment. After receiving the Digital488HS/32, carefully unpack all items
from the shipping carton and check for any obvious signs of physical damage. Report
any such damage found to the shipping agent immediately. Retain all shipping
materials in the event that shipment back to the factory is necessary.

Every Digital488HS/32 is shipped with the following items:

Digital488HS/32 High Speed Digital I/O Interface

•

DigitalHS-901 Instruction Manual

•

• 167-0800 Accessory Kit, which includes:
CA-1 Power Cable
FU-1-.25 1/4 Amp Replacement Fuse
FE-1 Rubber Feet (4)
EN-6 Rack Ears (2)
HA-41-6 Rack Ear Screws (4)
CN-19-37 37 Pin Male Connectors (2)
CN-17-37 Hood for CN-19-37 (2)

2.2 Configuration

The Digital488HS/32 has one external eight position switch, accessible from the rear
panel, and four internal eight position configuration switches (S2, S3, S4 and S5).

2.2.1 Factory Defaults

The Digital488HS/32 is factory configured to the following switch settings.

MODE

O
U

I

T

N

16 16

NDAC HOLDOFF ENABLE

1

1 3456782

88 168421

DIS IEEE ADDRESS

SRQ EN FULL

iDAV POL

iBUSY POL

ist EN FULL

iEND POL

iDATA POL

SRQ EN SB1

SRQ EN SB2

87654321

S2

OPEN

8

9

OUT

1 2 3 4 5 6 7 8

HI LO

PTO DEFAULT

1011121314

OPEN

15

0

S4

SRQ EN EMPTY

ist EN EMPTY

oDAV POL

oEND POL

oBUSY POL

oDATA POL

OPEN

012

OUT

1 2 3 4 5 6 7 8

HI LO

PTO DEFAULT

TRIGGER POL

CLR POL

87654321

3

4

5

6

OPEN

S3

7

S5

2.2.2 Internal Switch Settings

The internal settings on the Digital488HS/32 are for the line voltage, input and output
settings and the PTO default settings.

WARNING

Disconnect the power cord from the ac line and
from the Digital488HS/32 prior to disassembly.
Disconnect any cables prior to disassembly.

WARNING

Never open the Digital488HS/32 case while it is
connected to the ac line. Failure to observe this
warning may result in equipment failure,
personal injury or death.

Place the interface on a flat surface. Remove the four (4) screws located at each
corner. Carefully remove the top cover. Modify the parameters appropriate for your
installation and carefully re-assemble the interface using the reverse of the procedure
described.

2.2.2.1 Line Voltage Selection

The Digital488HS/32 may be operated from 110 or 220 V ac. The unit was shipped
from the factory set for the operating voltage marked on the label placed over the
power jack on the rear panel. To change the operating voltage, change the setting ot
internal switch S7 according to the following instructions.

WARNING

The Digital488HS/32 is intended for INDOOR
USE ONLY. Failure to observe this warning
could result in equipment failure, personal
injury or death.

1. The line voltage selection switch (S7) is located below the main power suply
transformer (T2). Insert the tip of a small screwdriver into the slot of the switch
and move the switch so the desired line voltage appears on the switch.

2. Install a power line fuse appropriate for the line voltage. The fuse is located below
the internal line voltage switch (S7). Gently pull upward on the plastic fuse
housing. Remove the entire housing with the fuse inside. Select a fuse with the
proper rating (see table below).

Line Voltage Fuse Type

105-125V 1/2A 250V, Slo Blo, 3AG
210-250V 1/4A 250V, Slo Blo, 3AG

A fuse with a rating higher than that specified
may cause damage to the instrument. If the
instrument repeatedly blows fuses, contact the
factory.

3. Open the fuse housing by pushing up on the tab on the bottom of the housing.

4. Replace the fuse and close the housing. Insert the fuse housing into the fuse
holder.

5. Make note of the new voltage setting for later reference and carefully re-assemble
the unit.

2.2.2.2 Input Setup

Several features are available for the input port. These features are selected by
internal switch S2, labeled INPUT SETUP. The factory defaults for these feature
selections are shown on the next page.

The features include:

SRQ On Input Port Full (Serial Poll Feature)
SRQ On Status Bit 1 - SB1 (Serial Poll Feature)
SRQ On Status Bit 2 - SB2 (Serial Poll Feature)
ist Enable on Input Port Full (Parallel Poll Feature)
Polarity Selection for Input Data, iEND, iD AV and iBusy Lines

The digital input port contains 16 bits of TTL level inputs, one END line (iEND)
input, two handshake lines (iDAV and iBusy), one control line (\iRESET), two status
lines (SB1 and SB2), and logic supply lines (+5V and ground).

SRQ EN FULL

iDAV POL

iBUSY POL

ist EN FULL

iEND POL

iDATA POL

SRQ EN SB1

SRQ EN SB2

87654321

S2

OPEN

Input Port Feature Selection Switch

Default Settings

2.2.2.2.1 S2-1 SRQ EN Full: Service Request Enable

Service Request (SRQ) Enable causes the Digital488HS/32 to generate a service
request on the IEEE 488 bus when iDAV transitions from the inactive (not Full) to
the active state (Full), indicating the external device has transferred data and the port
is Full. Default is SRQ on Full disabled.

SRQ EN FULL

8

7654321

OPEN

SRQ on Full Disabled

S2

SRQ EN FULL

87654321

S2

OPEN

SRQ on Full Enabled

(default)

SRQ On Input Port Full Selection

2.2.2.2.2 S2-2

ist

EN Full: Individual Status Message True on Input Port Full

Enable

The Full status of the input port can be sensed via parallel polls when the ist
(individual status message) Enable is selected. See section 3.4 for more information.
Default is disabled.

ist EN FULL

OPEN

ist

on Input Full Disabled

87654321

S2

ist

ist EN FULL

87654321

S2

OPEN

on Input Full Enabled

(default)

Individual Status Message (

ist

) on Full Status

2.2.2.2.3 S2-3 iDAV POL: Input Data Available Handshake Line

The Input Data available handshake line is an input line sourced by the external
device. It can be configured for rising edge or falling edge operation. Factory default
is falling edge operation.

iDAV POL

87654321

OPEN

Falling Edge iDAV

(default)

Polarity Selection for the iDAV Handshake Line

S2

iDAV POL

87654321

S2

OPEN

Rising Edge iDAV

2.2.2.2.4 S2-4 iBUSY POL: Input Port Busy Handshake Line

The input port busy handshake line, iBusy, is an input line sourced by the
Digital488HS/32. It can be configured as active high or active low. Factory default is
active high.

iBUSY POL

87654321

OPEN

Active Low iBusy

S2

Active High iBusy

iBUSY POL

87654321

S2

OPEN

(default)

Polarity Selection for the iBusy Handshake Line

2.2.2.2.5 S2-5 iEND POL: Input End Control Line Polarity

The iEND control line is latched into the ninth bit of the second byte input port. This
latched iEND signal directly drives the IEEE 488 EOI line during the second byte
transfer and can be used to signal the end of the transfer to the IEEE 488 controller.
iEND can be set for active high or active low operation. Default is active high.

iEND POL

87654321

OPEN

Active Low iEND

S2

iEND POL

87654321

S2

OPEN

Active High iEND

(default)

Polarity Selection for the iEND Control Line

2.2.2.2.6 S2-6 iDATA POL: Input Data Polarity

The input data bits can be active high or active low. For example, if a data byte of
&h07 is transferred from the input port with the iData Polarity selected for active low
operation, the data byte received by the IEEE 488 controller will be &hF8.

At power on, iRESET, Device Clear (DCL) or Selected Device Clear (SDC), the 16­bit digital input latches are forced to a Not Full condition. Default setting is active
high.

iDATA POL

87654321

OPEN

Active Low iDATA

Polarity Selection for the Input Port Data Lines

S2

iDATA POL

87654321

S2

OPEN

Active High iDATA

(default)

2.2.2.2.7 S2-7 and S2-8 SRQ EN SB1 and SRQ EN SB2: Service Request

on External Status Bit 1 and 2

The input port has two status line inputs that allow the external device to request
service to the IEEE 488 bus via the Digital488HS/32. Each of these status line inputs
is capable of generating an SRQ on the bus when this feature is enabled. When
enabled, a service request is generated on the rising edge of the SB signal lines. This
active polarity i s not s witch select able. Each s tatus b it can be p olled by the IEEE 488
bus controller via serial polls. The level of the signal is latched at the beginning of the
serial poll process. Default is SRQ disabled.

SRQ EN SB1

87654321

OPEN

SRQ on SB1 Disabled

(default)

SRQ On External Status Bit 1 (SB1) Selection

OPEN

S2

OPEN

SRQ on SB1 Enabled

SRQ EN SB2

87654321

S2

SRQ EN SB1

87654321

S2

SRQ EN SB2

87654321

S2

OPEN

SRQ on SB2 Disabled

(default)

SRQ on SB2 Enabled

SRQ On External Status Bit 2 (SB2) Selection

2.2.2.3 Digital Output Port Setup

Several features are available for the output port. These features are selected by
internal switch S3, labeled OUTPUT SETUP. The factory defaults for these feature
selections are shown in the following.

The features include:

SRQ On Output Port Empty (Serial Poll Feature)
ist Enable on Output Port Empty (Parallel Poll Feature)
Polarity Selection for Output Data, oEND, oT rigger, oClear,

oDAV and oBusy Lines

The digital out put port contai ns 16 bits of TTL l evel outpu ts, one END lin e (oEND),
two handshake lines (oDAV and oBusy), four control lines (/oRESET, /OE, oClear
and oTrigger) and logic supply lines (+5V and ground).

SRQ EN EMPTY

ist EN EMPTY

oDAV POL

oBUSY POL

TRIGGER POL

oEND POL

oDATA POL

CLR POL

87654321

S3

OPEN

Output Port Feature Selection Switch

Default Settings

2.2.2.3.1 S3-1 SRQ EN EMPTY: Service Request Enable