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wibconf-Windows Interface Bus Configuration Utility Chapter 8
NI-488.2 User Manual for Windows 8-8 © National Instruments Corp.
Serial Poll Timeouts (Device Characteristic Only)
This timeout value controls the length of time the driver waits for a serial poll response
from a device. The IEEE 488.1 specification does not specify the length of time a
Controller should wait for the response byte. The default of 1 s should work for most
devices. If you seem to have problems with serial polls, try using a longer timeout value.
Terminate Read on EOS
Some devices send an EOS byte signaling the last byte of a data message. A yes
response in this field causes the GPIB board to terminate a read operation when it
receives the EOS byte. The default option for this characteristic is no.
Set EOI with EOS on Writes
A yes response in this field causes the GPIB board to assert the EOI line when the EOS
byte is detected on a write operation. The default option for this characteristic is no .
Type of Compare on EOS
This field specifies the type of comparison to be made with the EOS byte. You can state
whether to compare all eight bits or just the seven least significant bits, which are in
ASCII or ISO (International Standards Organization) format. The default option for this
characteristic is 7-bit .
Note : This field is only meaningful if a yes response was given for either the Set
EOI with EOS on Write field or the Terminate Read on EOS field.
EOS Byte
Some devices can be programmed to terminate a read operation when a selected character
is detected. A linefeed character (hex 0A) is a common EOS byte. The default option for
this characteristic is 00H.
Note: The driver does not automatically append an EOS byte to the end of data
strings on write operations. You must explicitly include this byte in your data
string. The EOS byte is used only so that the driver terminates read
operations properly.