National Instruments GPIB-PC - Manual (Page 39)

Installation and Configuration Section Two
GPIB-PC User Manual 2-14 ©National Instruments Corp.
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
popular one.
NOTE: To send the EOS character to a device in a write operation, you
must explicitly include that byte in your data string.
EOS Modes
• Terminate a Read on EOS - Some devices send an EOS byte
signaling the last byte of a data message. A yes response will
cause the GPIB-PC to terminate read operations when it
receives the EOS byte.
• Set EOI with EOS on Write - A yes response will cause the
GPIB-PC to assert the EOI (send END) line when the EOS
character is sent.
• 7- or 8-bit compare on EOS - Along with the designation of an
EOS character, you may specify whether all eight bits are
compared to detect EOS, or just the seven least significant bits
(ASCII or ISO format).
Set EOI with last byte of Write
Some devices, as Listeners, require that the Talker terminate a data
message by asserting the EOI signal line (sending END) with the last
byte. A yes response will cause the GPIB-PC to assert EOI on the last
data byte.
GPIB-PC Model
The GPIB-PC Model must be specified so that the handler will use the
appropriate hardware addressing scheme.
Board is System Controller (Boards Only)
This field appears on the board characteristics screen only. Generally,
the GPIB-PC will be the System Controller. In some situations, such as
in a network of computers linked by the GPIB, another device may be
System Controller and the GPIB-PC will NOT be designated System
Controller. A yes response designates the GPIB-PC to be System
Controller. A no response designates it not to be System Controller.