VersaLogic VL-12CT96, VL-12CT97, VL-12CT98 Reference Manual

ReferenceReference
ManualManual

VL-12CT96
VL-12CT97
VL-12CT98

Analog & Digital Input/Output
Card for the STD 32 Bus

ii VL-12CT96/7 Analog & Digital I/O Card

Table of Contents

Table of Contents

1. Overview

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2. Configuration

Jumper Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

VL-12CT96/7 Jumper Block Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

VL-12CT96/7 Jumper Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Board Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

8-Bit Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

16-Bit Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

IOEXP Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Data Bus Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Analog Input Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Single Ended Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Pseudo-Differential Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Differential Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Current Loop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Input Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Settling Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Low Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Input Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Analog Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Output Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Output Local/Remote Sense. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Output Current Loop Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Output Voltage Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

5B01 Analog Signal Conditioning Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Digital Input/Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Rack Power Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Digital I/O Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Edge Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Interrupt Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

3. Installation

Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Signal Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Priority Chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

External Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

J1 — Analog Input Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

J2 — Analog Output Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

J3 — Digital I/O Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

VL-12CT96/7 Analog & Digital I/O Card iii

Table of Contents

4. Registers

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

I/O Port Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Analog Input Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Analog InputWrite Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Channel Select Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Convert Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Clear Flags Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Analog Input Read Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Analog Input Data Low Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Analog Input Data High Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Analog Input Data Representation (VL-12CT96, 12-Bit) . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Analog Input Data Representation (VL-12CT97, 16-Bit) . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Analog Output Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Analog Output Data Low Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Analog Output Data High Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Analog Output Data Representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Parallel Port Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Signal Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Parallel Port Data High Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Parallel Port Data Low Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

5. Operation

Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Polled Mode Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Interrupt Mode Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Digital I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Signal Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Signal Inversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Digital Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Interrupt Mode Digital Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Digital Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

System Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

6. Software Examples

Analog Input Code Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Analog Input Interrupt Mode Code Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Analog Output Code Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Parallel Port Code Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Parallel Port Interrupt Mode Code Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

7. Calibration

Analog Input Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Analog Output Calibration (Voltage Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Analog Output Calibration (Current Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

8. Reference

STD 80 Bus Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

STD 32 Bus Pinout Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

VL-12CT96/7 Parts Placement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

VL-12CT96/7 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

VL-12CT96/7 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8

iv VL-12CT96/7 Analog & Digital I/O Card

Overview

Overview

This manual details the installation and operation of VersaLogic’s VL-12CT96 and VL-12CT97
multifunction I/O cards. The VL-12CT96/7 cards include analog input, analog output, digital I/O, and
extended temperature operation. The VL-12CT96 has a 12-bit analog input converter, while the VL­12CT97 has a 16-bit converter.

Introduction

The VL-12CT96/7 provides 16 single-ended, or 8 differential analog input channels (12-bit resolution
for the VL-12CT96 or 16-bit resolution for the VL-12CT97). Four of the input channels may optionally
be configured for current loop input. The cards feature fast 10 µs conversion times, and on-board DC
to DC converters (requires +5 volt supply only). They operate with input ranges of ±5 volts or ±10 volts
(also ±50 mv or ±100 mv on the VL-12CT96). They can accommodate input signals in single-ended,
differential, or pseudo-differential configurations. Throughput up to 100KHz may be realized on these
cards.

The VL-12CT96/7 cards also include two 12-bit analog output channels. These channels may be
jumpered for ±5 volt or ±10 volt output at 5 ma. One channel may optionally be converted to a 4-20
ma output.

In addition to the analog sections, these cards also include 16 digital I/O lines. These digital lines
feature open-collector outputs with readback and are compatible with optically isolated modular I/O
racks.

Features

Analog Input:Analog Input:

•

Analog Input:

Analog Input:Analog Input:

8 Differential or 16 Single-Ended Input Channels
12-bit (VL-12CT96) or 16-bit (VL-12CT97) Resolution
±5V and ±10V Input Ranges
±50 mv and ±100 mv optional range on the VL-12CT96
Current Loop Input Option (4 channels)
Selectable Low Pass Filter
10 Microsecond Conversion Time
Auto Channel Increment Mode
Interrupt Support
5B01 Compatible Pinout

Analog Output:Analog Output:

•

Analog Output:

Analog Output:Analog Output:

2 Output Channels
12-bit Resolution
Independent ±5V and ±10V Output Ranges
Current Loop Option (1 Channel)

Digital Input/Output:Digital Input/Output:

•

Digital Input/Output:

Digital Input/Output:Digital Input/Output:

16 Channel Opto 22 Compatible
Interrupt Support
Opto 22 Compatible Pinout
TTL Compatible

Extended Temperature OperationExtended Temperature Operation

•

Extended Temperature Operation

Extended Temperature OperationExtended Temperature Operation
STD 32 (8- or 16-Bit Data), STD 80, STD Z80 CompatibleSTD 32 (8- or 16-Bit Data), STD 80, STD Z80 Compatible

•

STD 32 (8- or 16-Bit Data), STD 80, STD Z80 Compatible

STD 32 (8- or 16-Bit Data), STD 80, STD Z80 CompatibleSTD 32 (8- or 16-Bit Data), STD 80, STD Z80 Compatible

VL-12CT96/7 Analog & Digital I/O Card 1-1

Overview

Specifications

Specifications are typical at 25°C with 5.0V supply unless otherwise noted.

Size:Size:

Size: Meets all STD & STD 32 Bus mechanical specifications

Size:Size:
Storage Temperature:Storage Temperature:

Storage Temperature: –40°C to +85°C

Storage Temperature:Storage Temperature:
Free Air Operating Temperature:Free Air Operating Temperature:

Free Air Operating Temperature: –25°C to +85°C

Free Air Operating Temperature:Free Air Operating Temperature:
Power Requirements:Power Requirements:

Power Requirements: 5V ±5% @ 485 mA typ.

Power Requirements:Power Requirements:
Analog Input:Analog Input:

Analog Input:

Analog Input:Analog Input:

16 single ended or 8 differential channels
±50 mv, ±100 mv, ±5V, ±10V ranges
Resolution:

VL-12CT96: 12-bit, no missing codes
VL-12CT97: 16-bit, no missing codes

Accuracy (±5V or ±10V ranges):

VL-12CT96: ±0.022%

VL-12CT97: ±0.003%
10 µs conversion time
5 µs or 10µs settling time
±35 volt input overvoltage protection
.6 x 108 Ω input impedance

2.5 µA input bias current
±12 volt common-mode range
89 dB common-mode rejection (gain=1)

Analog Output:Analog Output:

Analog Output:

Analog Output:Analog Output:

2 channels
±5V or ±10V ranges
1 optional current loop output
15 µs settling time
Resolution: 12-bit
Accuracy: ±0.024%
5 ma maximum output current (per channel)

Digital I/O:Digital I/O:

Digital I/O:

Digital I/O:Digital I/O:

16 lines
Open collector
.7V maximum @ 12 ma low level output

Analog Temperature Coefficients:Analog Temperature Coefficients:

Analog Temperature Coefficients:

Analog Temperature Coefficients:Analog Temperature Coefficients:

Gain ±25 ppm/°C of FSR
Offset ±10 ppm/°C of FSR

Addressing: Addressing:

Addressing: I/O, 8- or 16-bits plus IOEXP

Addressing: Addressing:
Mapping: Mapping:

Mapping: 16-byte block on any 16-byte boundary

Mapping: Mapping:
Bus Compatibility:Bus Compatibility:

Bus Compatibility:

Bus Compatibility:Bus Compatibility:

STD Z80: Full compliance, all bus speeds
STD 80: Full compliance, all bus speeds
STD 32: I/O slave, SA16, SA8-I, IX

Specifications are subject to change without notice.

1-2 VL-12CT96/7 Analog & Digital I/O Card

Configuration

Configuration

Jumper Options

Various options available on the VL-12CT96/7 cards are selected using removable jumper blocks
(shorting plugs). Features are selected or deselected by installing or removing the jumpers as noted.
The terms “In” or “Jumpered” are used to indicate an installed plug; “Out” or “Open” are used to indicate
a removed plug.

Figure 2-1 shows the jumper block locations on the VL-12CT96/7 card. The figures indicate the position
of the jumpers as shipped from the factory.

VL-12CT96/7 Analog & Digital I/O Card 2-1

Configuration — Jumper Block Locations

VL-12CT96/7 Jumper Block Locations

Figure 2-1. Jumper Block Locations for VL-12CT96/7

2-2 VL-12CT96/7 Analog & Digital I/O Card

Configuration — Jumper Options

VL-12CT96/7 Jumper Options

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

DescriptionDescription

Description

DescriptionDescription

V1[1-2] Input Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Ended 2-8

In –Single-Ended or Pseudo-Differential
Out – Differential

V1[3-4] Input Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Normal 2-12

In – x100
Out – Normal

V1[5-6] Input Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Ended 2-8

In – Pseudo-Differential
Out – Single-Ended or Differential

V1[7-8] Input Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Ended 2-8

In – Differential
Out – Single-Ended or Pseudo-Differential

V1[9-10] Input Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Ended 2-8

In – Single-Ended
Out – Differential or Pseudo-Differential

V1[11-12] Differential Bias Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . In Circuit 2-10

In –In Circuit
Out – Disconnected

V2[1-2] Analog Loopback (Channel 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Independent 2-16

In –Connects DAC 0 output to ADC 0 input for diagnostic loopback
Out – Circuits operate independently

V2[3-4] Analog Loopback (Channel 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Independent 2-16

In –Connects DAC 1 output to ADC 1 input for diagnostic loopback
Out – Circuits operate independently

V3[1-2] DAC Channel 0 Remote Sense (IR Drop Compensation) . . . . . . . . . . . . . . . . . . . . . Local sense 2-15

In –Local sense (no compensation)
Out – Remote sense

V3[3-4] Channel 0 Output Range (±5 Volt Selection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V 2-15

In –±5 Volts
Out – ±10 Volts

V3[5-6] Channel 0 Output Range (±10 Volt Selection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V 2-15

In –±10 Volts
Out – ±5 Volts

V4[1-2] DAC Channel 1 Remote Sense (IR Drop Compensation) . . . . . . . . . . . . . . . . . . . . . Local Sense 2-15

In –Local sense (no compensation)
Out – Remote sense

V4[3-4] Channel 1 Output Range (±5 Volt Selection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V 2-15

In –±5 Volts
Out – ±10 Volts

V4[5-6] Channel 1 Output Range (±10 Volt Selection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V 2-15

In –±10 Volts
Out – ±5 Volts

V5 Opto-22 I/O Rack Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External 2-17

In –I/O rack power provided locally
Out – I/O rack power provided externally

V6[1-8] Input Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V 2-12

[1-2] & [7-8] In – ±10 Volts
[3-4] & [5-6] In – ±5 Volts

V6[9-10] Input Low Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enabled 2-13

In – Enabled
Out – Disabled

V7[1-2] Input Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Ended 2-8

In –Single-Ended or Pseudo-Differential
Out – Differential

V7[3-4] 5 µs Settling Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enabled 2-13

In – Enabled
Out – Disabled

V7[5-6] 10 µs Settling Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disabled 2-13

In – Enabled
Out – Disabled

V8[1-2] Data Bus Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-Bit 2-14

In –8-Bit Data Bus
Out – 16-Bit Data Bus

V8[3-4] Analog Input Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Varies 2-14

In –16-Bit Resolution (VL-12CT97 only)
Out – 12-Bit Resolution (VL-12CT96 only)

AsAs

As

AsAs
ShippedShipped

Shipped

ShippedShipped

PagePage

Page

PagePage

VL-12CT96/7 Analog & Digital I/O Card 2-3

Configuration — Jumper Options

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

DescriptionDescription

Description

DescriptionDescription

AsAs

As

AsAs
ShippedShipped

Shipped

ShippedShipped

PagePage

Page

PagePage

V9 Board Address (A8 – A15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0300H 2-6

[1-2] = In – A15 Decoded Low [1-2] = Out – A15 Decoded High
[3-4] = In – A14 Decoded Low [3-4] = Out – A14 Decoded High
[5-6] = In – A13 Decoded Low [5-6] = Out – A13 Decoded High
[7-8] = In – A12 Decoded Low [7-8] = Out – A12 Decoded High
[9-10] = In – A11 Decoded Low [9-10] = Out – A11 Decoded High
[11-12] = In – A10 Decoded Low [11-12] = Out – A10 Decoded High
[13-14] = In – A9 Decoded Low [13-14] = Out – A9 Decoded High
[15-16] = In – A8 Decoded Low [15-16] = Out – A8 Decoded High

V10 IOEXP Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IOEXP Ignored 2-7

[1-2] = In – Board responds to IOEXP high and low (IOEXP ignored)
[2-3] = In – Board responds to IOEXP low
[Both] = Out – Board responds to IOEXP high

V11 Address Mode Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-Bit 2-5

[1-2] = In – 16-Bit Address Decoding
[3-4] = In – 8-Bit Address Decoding

V12 Board Address (A4 – A7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0300H 2-5

[1-2] = In – A7 Decoded Low [1-2] = Out – A7 Decoded High
[3-4] = In – A6 Decoded Low [3-4] = Out – A6 Decoded High
[5-6] = In – A5 Decoded Low [5-6] = Out – A5 Decoded High
[7-8] = In – A4 Decoded Low [7-8] = Out – A4 Decoded High

V13[1-2] Parallel Port Interrupt Edge Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rising Edge Only 2-18

In –Rising Edge Only
Out – Rising and Falling Edges

V13[3-4] Parallel Port Interrupt Select (Module 0). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enabled 2-18

In –Activity on Module 0 (J3 Pin 31) generates interrupt request
Out – Disabled

V13[5-6] Parallel Port Interrupt Select (Module 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disabled 2-18

In –Activity on Module 1 (J3 Pin 29) generates interrupt request
Out – Disabled

V13[7-8] Parallel Port Interrupt Select (Module 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disabled 2-18

In –Activity on Module 2 (J3 Pin 27) generates interrupt request
Out – Disabled

V13[9-10] Parallel Port Interrupt Select (Module 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disabled 2-18

In –Activity on Module 3 (J3 Pin 25) generates interrupt request
Out – Disabled

V14[1-2] Use STD Bus IRQx to carry parallel port interrupt signal . . . . . . . . . . . . . . . . . . . . . . Disabled 2-19

In –Connects parallel port interrupt circuitry to STD Bus IRQx (E47)
Out – Frees IRQx to be used for other purposes

V14[2-3] Use STD Bus IRQx to carry ADC conversion complete interrupt. . . . . . . . . . . . . . . . Disabled 2-19

In –Connects ADC interrupt circuitry to STD Bus IRQx (E47)
Out – Frees IRQx to be used for other purposes

V15[1-2] Use STD Bus IRQ* to carry parallel port interrupt signal . . . . . . . . . . . . . . . . . . . . . . Disabled 2-19

In –Connects parallel port interrupt circuitry to STD Bus IRQ* (P44)
Out – Frees IRQ* to be used for other purposes

V15[2-3] Use STD Bus IRQ* to carry ADC conversion complete interrupt . . . . . . . . . . . . . . . . Enabled 2-19

In –Connects ADC interrupt circuitry to STD Bus IRQ* (P44)
Out – Frees IRQ* to be used for other purposes

V16[1-2] Use STD Bus IRQ1* to carry parallel port interrupt signal . . . . . . . . . . . . . . . . . . . . . Enabled 2-19

In –Connects parallel port interrupt circuitry to STD Bus IRQ1* (P37)
Out – Frees IRQ1* to be used for other purposes

V16[2-3] Use STD Bus IRQ1* to carry ADC conversion complete interrupt . . . . . . . . . . . . . . . Disabled 2-19

In –Connects ADC interrupt circuitry to STD Bus IRQ1* (P37)
Out – Frees IRQ1* to be used for other purposes

V17[1-2] Use STD Bus IRQ2* to carry parallel port interrupt signal . . . . . . . . . . . . . . . . . . . . . Disabled 2-19

In –Connects parallel port interrupt circuitry to STD Bus IRQ2* (P50)
Out – Frees IRQ2* to be used for other purposes

V17[2-3] Use STD Bus IRQ2* to carry ADC conversion complete interrupt . . . . . . . . . . . . . . . Disabled 2-19

In –Connects ADC interrupt circuitry to STD Bus IRQ2* (P50)
Out – Frees IRQ2* to be used for other purposes

V18[1-2] Use STD Bus IRQ3* to carry parallel port interrupt signal . . . . . . . . . . . . . . . . . . . . . Disabled 2-19

In –Connects parallel port interrupt circuitry to STD Bus IRQ3* (E67)
Out – Frees IRQ3* to be used for other purposes

V18[2-3] Use STD Bus IRQ3* to carry ADC conversion complete interrupt . . . . . . . . . . . . . . . Disabled 2-19

In –Connects ADC interrupt circuitry to STD Bus IRQ3* (E67)
Out – Frees IRQ3* to be used for other purposes

Figure 2-2. VL-12CT96/7 Jumper Functions

2-4 VL-12CT96/7 Analog & Digital I/O Card

Configuration — Board Addressing

Board Addressing

The VL-12CT96/7 card supports both 8- and 16-bit I/O addressing. 8-bit addressing is used with most
8-bit processors (Z80, 8085, 6809, etc.) which provide 256 I/O addresses. 16-bit addressing can be used
with 16-bit processors (i.e. 8088, 80188, etc.) to decode up to 65536 I/O port addresses.

Both 8- and 16-bit addressing can be extended (capacity doubled) using the IOEXP signal which is
decoded on board.

As shipped, the board is configured for 16-bit addressing with a board address of hex 0300. The card
occupies sixteen consecutive I/O addresses (0300H to 030FH). Twelve of these addresses are mapped
to control, data, and status registers, the remaining four are inaccessible. See the I/O Port Mapping
section on page 4-1 for further information.

8-Bit Addressing

To configure the board for an 8-bit I/O address, refer to the figure below. Use the table to select the
jumpering for the appropriate upper hex digit of the desired starting address (i.e., “3” and “0” = hex
address 30). Note: the lower digit is always “0.”

V12 V12 V12 V12 Upper Lower

1-2 3-4 5-6 7-8 Digit Digit

XXXX0 Always “0”
XXX—1
XX—X2
XX——3
X—XX 4
X—X—5
X——X 6

X——— 7
—XXX8
—XX—9
—X—XA
—X——B
——X X C
——X—D
———X E
————F

X = Jumper installed

—= Jumper removed

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V12 Board Address (A4 – A7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0300H (16-Bit)

DescriptionDescription

Description

DescriptionDescription

[1-2] = In – A7 Decoded Low [1-2] = Out – A7 Decoded High
[3-4] = In – A6 Decoded Low [3-4] = Out – A6 Decoded High
[5-6] = In – A5 Decoded Low [5-6] = Out – A5 Decoded High
[7-8] = In – A4 Decoded Low [7-8] = Out – A4 Decoded High

AsAs

As

AsAs
ShippedShipped

Shipped

ShippedShipped

VL-12CT96/7 Analog & Digital I/O Card 2-5

Figure 2-3. 8-Bit Address Jumpers

Configuration — Board Addressing

16-Bit Addressing

To configure the board for a 16-bit I/O address refer to the figure below. Use the table to select the
jumpering for the appropriate four hex digits of the desired starting address (i.e., “1” and “2” and “3”
and “0” = hex address 1230). Note: the lower digit is always “0.”

V9 V9 V9 V9 Upper V9 V9 V9 V9 2nd V12 V12 V12 V12 3rd Lower

1-2 3-4 5-6 7-8 Digit 9-10 11-12 13-14 15-16 Digit 1-2 3-4 5-6 7-8 Digit Digit

XXXX0 XXXX0 XXXX0 Always “0”
XXX—1 XXX—1 XXX—1
XX—X2 XX—X2 XX—X2
XX——3 XX——3 XX——3
X—XX 4 X—X X 4 X—XX 4
X—X—5 X—X—5 X—X—5
X——X 6 X——X6 X——X 6

X——— 7 X———7 X——— 7
—XXX8 —XXX8 —XXX8
—XX—9 —XX—9 —XX—9
—X—XA —X—X A —X—XA
—X——B —X——B —X——B
——X X C ——X X C ——X X C
——X—D ——X—D ——X—D
———X E ———X E ———X E
————F ———— F ————F

X = Jumper installed

-- = Jumper removed

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V9 Board Address (A8 – A15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0300H

V12 Board Address (A4 – A7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0300H

DescriptionDescription

Description

DescriptionDescription

[1-2] = In – A15 Decoded Low [1-2] = Out – A15 Decoded High
[3-4] = In – A14 Decoded Low [3-4] = Out – A14 Decoded High
[5-6] = In – A13 Decoded Low [5-6] = Out – A13 Decoded High
[7-8] = In – A12 Decoded Low [7-8] = Out – A12 Decoded High
[9-10] = In – A11 Decoded Low [9-10] = Out – A11 Decoded High
[11-12] = In – A10 Decoded Low [11-12] = Out – A10 Decoded High
[13-14] = In – A9 Decoded Low [13-14] = Out – A9 Decoded High
[15-16] = In – A8 Decoded Low [15-16] = Out – A8 Decoded High

[1-2] = In – A7 Decoded Low [1-2] = Out – A7 Decoded High
[3-4] = In – A6 Decoded Low [3-4] = Out – A6 Decoded High
[5-6] = In – A5 Decoded Low [5-6] = Out – A5 Decoded High
[7-8] = In – A4 Decoded Low [7-8] = Out – A4 Decoded High

Figure 2-4. 16-Bit Address Jumpers

AsAs

As

AsAs
ShippedShipped

Shipped

ShippedShipped

2-6 VL-12CT96/7 Analog & Digital I/O Card

Configuration — Board Addressing/Data Bus Width

IOEXP Signal

The IOEXP (I/O expansion) signal on the STD Bus is normally used to select between two different I/
O banks or maps. It can be used to double the number of available I/O addresses in the system (by
selecting between two banks of I/O boards). The IOEXP signal is usually controlled by (or jumpered
to ground on) the system CPU card.

A low IOEXP signal usually selects the standard or normal I/O map. A high IOEXP signal usually
selects the secondary or alternate I/O map. Boards that ignore (or do not decode) IOEXP will appear
in both I/O maps.

As shipped the IOEXP jumper is configured to ignore the IOEXP signal. The board will be addressed
whether the IOEXP signal is high or low. It can be jumpered for two other modes as shown below.

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V10 IOEXP Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IOEXP Ignored

DescriptionDescription

Description

DescriptionDescription

[1-2] = In – Board responds to IOEXP high and low (IOEXP ignored)
[2-3] = In – Board responds to IOEXP low
[Both] = Out – Board responds to IOEXP high

AsAs

As

AsAs
ShippedShipped

Shipped

ShippedShipped

Figure 2-5. IOEXP Options

Data Bus Width

The VL-12CT96/7 provides both 8-bit and 16-bit data paths to the bus. The 8-bit mode is compatible
with STD 80, STD Z80, and STD 32 bus specifications. The 16-bit mode is used only when operating
the card in an STD 32 card cage.

In 8-bit mode, the register map for the VL-12CT96/7 is a superset of the Analog Devices RTI-1265 board.
In 16-bit mode, the registers are remapped to even addresses for efficient I/O access. This allows the
full A/D data word to be read in a single bus cycle. See the I/O Port Mapping section on page 4-1 for
further information.

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V8[1-2] Data Bus Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-Bit

DescriptionDescription

Description

DescriptionDescription

In – 8-Bit Data Bus
Out – 16-Bit Data Bus

VL-12CT96/7 Analog & Digital I/O Card 2-7

Figure 2-14. Data Bus Width Jumper

AsAs

As

AsAs
ShippedShipped

Shipped

ShippedShipped

Configuration — Analog Input

Analog Input Configuration

The VL-12CT96/7 board accommodates 16 single-ended or 8 differential input channels.

Input Mode

The board can be configured for three types of analog inputs: differential, single-ended, or pseudo­differential. All inputs connected to the board must be of the same type.

When operated in differential mode, four channels can be configured to accept 4-20ma current loop
input.

Typical connections for the three input modes are shown in the figures below. Since ground loops
(current flowing between various equipment ground lines) affect analog measurements made with
reference to ground, careful attention should be paid to the ground connections shown. In particular,
the STD Bus power supply logic ground line should never be connected to earth ground when operating
in the differential or pseudo-differential modes.

Single Ended Mode

Single-ended mode is used for signals that are referenced to a common ground. It is normally used only
for higher level signals on short distance runs (less than 10 feet). 16 input channels are available in
single-ended mode.

OPTIONAL

V0

V1

VL-12CT96
VL-12CT97

+

-

+

-

CHANNEL 0

CHANNEL 1

AGND

1

V1

1

3

5

5
7
9

9

11

As Shipped

V6

1
3
5

2

7

4

9

6

8
10
12

2
4
6
8

10

5

3

1

V7

2

4

6

Figure 2-6. Single Ended Input Mode

2-8 VL-12CT96/7 Analog & Digital I/O Card

Configuration — Analog Input

Pseudo-Differential Mode

Pseudo-differential mode is used for signals that are not referenced to ground, but are all connected
to a single common return line. This mode can provide most of the advantages of full differential input
while requiring fewer total wires. 16 input channels are available in pseudo-differential mode. This
mode is used when connecting to a 5B01 signal conditioning rack.

VL-12CT96
VL-12CT97

OPTIONAL

V0

V1

+

CHANNEL 0

-

+

CHANNEL 1

-

AGND

P.D. SENSE

Figure 2-7. Pseudo-Differential Input Mode

25

V6

1

V1

1
3

5

5
7
9

11

1
3
5
7

4

9

6

8
10
12

9

2
4
62
8

10

5

3

1

V7

2

4

6

VL-12CT96/7 Analog & Digital I/O Card 2-9

Configuration — Analog Input

Differential Mode

Differential mode is used for signals that are not referenced to a common ground point. Each input
signal is represented as a voltage difference between two signal conductors (usually twisted wires), and
is presented to the board as a (+) and (–) pair. Differential mode reduces the effects of electromagneti­cally induced noise and ground currents in electrically noisy environments. It is especially useful in
eliminating the effects of common mode noise generated on input lines over longer distances. Eight
input channels are available in differential mode.

VL-12CT96
VL-12CT97

V6

1

2

3

4

5

2
4
6

8
10
12

6

7

8

9

10

5

3

1

V7

2

4

6

OPTIONAL

V0

V1

+

-

CHANNEL 0

+

-

SEE
TEXT

CHANNEL 1

+

1

-

2

+

5

-

4

V1

1
3
5
7
9

11

Figure 2-8. Differential Input Mode

Note that in full differential operation a return path must be provided for the bias currents of the input
amplifier. An on-board 1M Ω resistor is provided for this purpose. Jumper V1[11-12] should be
inserted.

In noisy electrical environments, the bias resistor should be located in close proximity to the voltage
source. Jumper V1[11-12] should be removed under these conditions.

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

DescriptionDescription

Description

DescriptionDescription

V1[11-12] Differential Bias Resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . In Circuit

In – In Circuit
Out – Disconnected

AsAs

As

AsAs
ShippedShipped

Shipped

ShippedShipped

Figure 2-9. Bias Resistor

2-10 VL-12CT96/7 Analog & Digital I/O Card

Configuration — Analog Input

Current Loop Mode

In addition to voltage mode inputs, the VL-12CT96/7 can accept up to four 4-20 ma current loop inputs.
Channels 0 through 3 can be converted to current-loop input by installing 200 to 250 Ω, ¼W, 0.1%
precision resistors in locations R4 through R7 respectively.

The board must be jumpered for differential mode, and the input range should be jumpered for ±5V
operation when using current loop inputs. A signal proportional to the 4-20 ma current is developed
across the precision resistors. This voltage is applied to the VL-12CT96/7 as a differential-mode signal,
and is converted into digital values.

VL-12CT96

+

I

LOOP

CHANNEL 0

1
2

-

VL-12CT97

R4

R5

R6

R7

V1

1
3
5
7
9

11

V6

1

2

3

4

5

6

7

2
4
6

8
10
12

8

9

10

5

3

1

V7

2

4

6

Figure 2-10. Current Loop Input Mode

VL-12CT96/7 Analog & Digital I/O Card 2-11

Configuration — Analog Input

Input Range

The board may be operated with an input range of ±5 volts, ±10 volts, ±50 mv, or ±100 mv. To achieve
the maximum digital resolution and to prevent saturation, the range which most closely matches the
input signal should be chosen. All channels operate with the same input range.

As shipped the board is configured for ±10 volt operation. It can be jumpered for other ranges as shown
below.

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V1[3-4] Input Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Normal

V6[1-8] Input Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V

DescriptionDescription

Description

DescriptionDescription

In – x100
Out – Normal

[1-2] & [7-8] In – ±10 Volts
[3-4] & [5-6] In – ±5 Volts

AsAs

As

AsAs
ShippedShipped

Shipped

ShippedShipped

Figure 2-11. Input Range Jumper

2-12 VL-12CT96/7 Analog & Digital I/O Card

Configuration — Analog Input

Settling Time

The VL-12CT96/7 board inserts a short delay between the time a channel is selected and time the A/
D conversion begins. The delay allows the multiplexer and associated circuitry to properly settle for
a more accurate reading.

The settling delay starts when the Channel Select register is written to by software, or when the Data
High register is read (in auto increment mode). After channel selection (during the settling time), the
A/D conversion cycle can be started by writing to the Convert register; however, the A/D converter is
not triggered until the delay time elapses. The time delay is not inserted when one channel is read
repeatedly.

The standard 5 µS delay (as shipped) is used for ±5V or ±10V input ranges. The longer 10 µS settling
delay is needed for the ±50 mv or ±100 mv input ranges.

Settling delay times can be selected as indicated in the figure below.

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V7[3-4] 5 µS Settling Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enabled

V7[5-6] 10 µS Settling Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disabled

DescriptionDescription

Description

DescriptionDescription

In – Enabled
Out – Disabled

In – Enabled
Out – Disabled

AsAs

As

AsAs
ShippedShipped

Shipped

ShippedShipped

Figure 2-12. Settling Time Jumpers

Low Pass Filter

A 1 MHz low pass filter between the instrumentation amplifier and the A/D convertor can be selected
as shown in the figure below. This filter is used to reject high frequency noise and is normally enabled.

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

DescriptionDescription

Description

DescriptionDescription

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V6[9-10] Input Low Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enabled

In – Enabled
Out – Disabled

VL-12CT96/7 Analog & Digital I/O Card 2-13

Figure 2-13. Low Pass Filter Jumper

Configuration — Analog Input

Input Resolution

The VL-12CT96 provides 12 bits of resolution (4096 digital counts). For correct operation, jumper V8[3­4] should be removed. The VL-12CT97 provides 16 bits of resolution (65536 counts) for applications
which require finer resolution. For correct operation, jumper V8[3-4] should be inserted.

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V8[3-4] Analog Input Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Varies

DescriptionDescription

Description

DescriptionDescription

In – 16-Bit Resolution (VL-12CT97 only)
Out – 12-Bit Resolution (VL-12CT96 only)

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Figure 2-15. Input Range Selection

Analog Output Configuration

The VL-12CT96/7 board accommodates two analog output channels. Both output channels are single­ended and are referenced to analog ground. The digital data format is two’s complement.

2-14 VL-12CT96/7 Analog & Digital I/O Card

Configuration — Analog Output

Output V oltage Range

Each output channel can be configured independently to produce output voltage ranges of ±5 volts, or
±10 volts as shown below.

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V3[3-4] Channel 0 Output Range (±5 Volt Selection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V

V3[5-6] Channel 0 Output Range (±10 Volt Selection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V

V4[3-4] Channel 1 Output Range (±5 Volt Selection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V

V4[5-6] Channel 1 Output Range (±10 Volt Selection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10V

DescriptionDescription

Description

DescriptionDescription

In – ±5 Volts
Out – ±10 Volts

In – ±10 Volts
Out – ±5 Volts

In – ±5 Volts
Out – ±10 Volts

In – ±10 Volts
Out – ±5 Volts

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Figure 2-16. Output Voltage Range

Output Local/Remote Sense

When a load is driven over a long cable, the resistance of the wire can cause a voltage drop to occur. This
can result in erroneous signal levels at the remote end of the line. The VL-12CT96/7 board can compensate
for this drop (up to 3 volts of loss) by measuring the voltage at the far end of the line through a separate
sense line.

Each channel can be jumpered for local sense (voltage measured at the card edge, no sense wire used),
or remote sense (voltage measured at the destination, sense wire required).

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V3[1-2] DAC Channel 0 Remote Sense (IR Drop Compensation). . . . . . . . . . . . . . . . . . . . . . . . . . Local sense

V4[1-2] DAC Channel 1 Remote Sense (IR Drop Compensation). . . . . . . . . . . . . . . . . . . . . . . . . . Local sense

DescriptionDescription

Description

DescriptionDescription

In – Local sense (no compensation)
Out – Remote sense

In – Local sense (no compensation)
Out – Remote sense

VL-12CT96/7 Analog & Digital I/O Card 2-15

Figure 2-17. Remote Sense Jumpers

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Configuration — Analog Output

Output Current Loop Option

Channel 0 can optionally be configured to produce current loop output in the range of 4 to 20 mA.
Normally this is a factory installed option. Contact VersaLogic for further information.

Note: When using the 4-20 mA option, channel 0 must be configured for ±10 volt output range.
An external loop power source between 15 and 30 volts must be connected to J1 pin 5 (LP0) as shown

below. This power source must be capable of providing 25 mA of current.

VL-12CT96
VL-12CT97

CHANNEL 0

0 to +10V

J2

5

~

5

~
mA

4 to 20 mA

6

4

R

LOAD

EXTERNAL LOOP
POWER SOURCE

+15V TO +30V

Figure 2-18. Current Loop Connection

Output Voltage Loopback

The output channels can be connected to their corresponding input channels for a direct readback of
the voltage. The looped back output channels are also available on J1 for user and 5B01 rack
connections.

JumperJumper

Jumper

JumperJumper
BlockBlock

Block

BlockBlock

V2[1-2] Analog Loopback (Channel 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Independent

V2[3-4] Analog Loopback (Channel 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Independent

DescriptionDescription

Description

DescriptionDescription

In – Connects DAC 0 output to ADC 0 input for diagnostic loopback
Out – Circuits operate independently

In – Connects DAC 1 output to ADC 1 input for diagnostic loopback
Out – Circuits operate independently

Figure 2-19. Analog Output Loopback

2-16 VL-12CT96/7 Analog & Digital I/O Card

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