Communication Errors; Repeat Addressing; Termination Method; Other Errors - National Instruments NI-488.2 User Manual

Communication Errors

Repeat Addressing

Note National Instruments recommends using

Termination Method

Other Errors

© National Instruments Corporation
The following sections describe communication errors you might
encounter in your application.
Devices adhering to the IEEE 488.2 standard should remain in their current
state until specific commands are sent across the GPIB to change their
state. However, some devices require GPIB addressing before any GPIB
activity. Therefore, you might need to configure your NI-488.2 driver to
perform repeat addressing if your device does not remain in its currently
addressed state. You can either reconfigure from your application using
, or reconfigure using the NI-488.2 Configuration utility.
ibconfig
If your application uses
previous configuration. For more information about
description of
ibconfig
accessing the online help, refer to the
section in About This
You should be aware of the data termination method that your device uses.
By default, your NI-488.2 software is configured to send EOI on writes and
terminate reads on EOI or a specific byte count. If you send a command
string to your device and it does not respond, it might not be recognizing
the end of the command. In that case, you need to send a termination
message, such as <CR> <LF>, after a write command, as follows:
ibwrt(dev,"COMMAND\x0A\x0D",9);
If you experience other errors in your application, refer to the NI-488.2
online help. It includes extensive troubleshooting information and the
answers to frequently asked questions. For instructions on accessing the
online help, refer to the
About This Manual.
Chapter 4
ibconfig
, it works properly regardless of the
ibconfig
in the NI-488.2 online help. For instructions on
Using the NI-488.2 Documentation
Manual.
Using the NI-488.2 Documentation
4-5
Debugging Your Application
to modify the configuration.
, refer to the
ibconfig
section in
NI-488.2 User Manual for Windows