VXI VT1536A User Manual
VT1536A
Isolated Digital Input/Output
Signal Conditioning Plug-on
User’s and SCPI Programming Manual
Where to Find it - Online and Printed Information:
System installation (hardware/software)............VXIbus Configuration Guide*
HP VIC (VXI installation software)*
Module configuration and wiring.......................This Manual
SCPI programming.............................................This Manual
VXIplug&play programming ............................VXIplug&play Online Help
VXIplug&play example programs .....................VXIplug&play Online Help
VXIplug&play function reference......................VXIplug&play Online Help
Soft Front Panel information.............. ................VXIplug&play Online Help
VISA language information................... .... .........Agilent/HP VISA User's Guide
Agilent/HP VEE programming information.......Agilent/HP VEE User's Manual
*Supplied with HP Comman d Mod ules , Embedded Controllers, and VXLink.
Copyright © VXI Technolo gy, Inc., 2003
Manual Part Number: 82-0092-000
Printed in U.S.A.
Introduction
VT1536A Isolated Digital
Input/Output SCP
The VT1536A is an eight-channel Isolated Digital I/O SCP. Channels are
switch configurabl e as either input or out put on a channel- by-channel bas is.
Input-configured channels provide:
•Optically coupled isolati on
•Individual switch selectable threshold levels of 5, 12, 24 and 48 VDC
•Two programmable debounce timers (150 µs to 2.4 s); one for the
SCP's lower 4 channels and one for the SCP's higher 4 channels.
•Programmable polarity
Output-configured channels provide:
•SPST Solid-state relay output
•200 mA current carrying capability
•Relays protected by active voltage clamping
•Programmable polarity
About this Manual
This manual shows you how to configure the Signal Conditioning Plug-on
(SCP) using SCPI commands and explains the capabilities of this SCP.
The contents of this manual are:
• Identifying the Plug-on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
• Setting Configuration Switches . . . . . . . . . . . . . . . . . . . . . . . . page 4
• Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5
• Connecting To The Terminal Module. . . . . . . . . . . . . . . . . . . . page 5
• Recommended Signal Connections . . . . . . . . . . . . . . . . . . . . . page 6
• Input and Output Characteristics. . . . . . . . . . . . . . . . . . . . . . . . page 7
Output Voltage Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8
• Programming With SCPI Commands. . . . . . . . . . . . . . . . . . . page 10
Configuring Input Channel Polarity . . . . . . . . . . . . . . . . . . . page 11
Setting Debounce Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11
Configuring Output Channel Polarity. . . . . . . . . . . . . . . . . page 13
• Programming with the VT1415A/19A Algorithm Language. page 14
• *RST and *TST? (Important!) . . . . . . . . . . . . . . . . . . . . . . . . page 14
• Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 15
VT1536A Isolated Digital Input/Output SCP 3
Identifying the Plug-on
You'll find the VXI Te chnology part number on the connector side of the
SCP. For the VT1536A, the part number is: VT1536A.
Setting Configuration Switches
Each channel has a four-switch package that configure its input threshold
voltage level and I/O direction.
Locating switches Figure 1 shows the location of each chann el's confi guration switch pac kage.
Figure 1 Locating and Setting Threshold Switches
Important! Make certai n that you slide the swit ch handles complet ely to the ON or OFF
position! Verify switch se ttin gs with th e
An invalid switch sett ing will cause the r elated channel to be have as an input
with unknown threshold level.
4 VT1536A Isolated Digital Input/Output SCP
INP:THReshold:LEVel? command.
Configuring for Input Refer again to Figure 1 for the four valid input threshold, switch
configurations. Table 1 shows the "input zero" and "input one" levels for the
nominal threshold settings.
Table 1 Input Threshold Voltage Levels
Nominal
Threshold Level
5 2.1 1.4
12 7 2
24 13 3
48 25 5
Input One
VDC Minimum
Input Zero
VDC Maximum
Configuring for Output By turning all four of its threshold-setting switches OFF, a channel is
configured as an output channel.
Installation
After the switches have been conf igured, the installat io n for th is Pl ug- on is
common to several other s and is covered in Ch apt er 1 o f your VXI Module
User's Manual.
Connecting To The Terminal Module
T o get sta rted on field wiring to the VT1536A SCP you'll nee d to know that
input-configured cha nnels ARE POLARIZED. That is the H ter mina l must
be driven positive rela tive to the L terminal. Output-con figured channels are
not polarized. For more i nform ati on see
“Input and Output Character isti cs ”
on page 7.
The SCP connections for the Terminal Modules are shown on the
self-adhesive labels that come with the SCP. Use these to label terminal
definitions on your t erminal module . The connections a re shown in
Figure 2.
VT1536A Isolated Digital Input/Output SCP 5
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