Agilent Technologies 8712ET Programmer's Manual page 22

Introduction to GPIB Programming
Programming Fundamentals
Remote Enable (REN)
REN is a single line on the GPIB. When it is set TRUE, the analyzer will
enter the remote mode when addressed to listen. It will remain in remote
mode until it receives the Go to Local (GTL) command or until the REN
line is set FALSE.
When the analyzer is in remote mode and local lockout mode, all front
panel keys are disabled. When the analyzer is in remote mode but not in
local lockout mode, all front panel keys are disabled except for the
softkeys. The remote softkey menu includes seven keys that are
available for use by a program. The eighth softkey is the
Return to Local
analyzer to local mode, enabling all other front-panel keys.
Selected Device Clear (SDC)
The analyzer responds to this command in the same way that it responds
to the Device Clear (DCL) command.
When the analyzer receives this command it does the following:
• clears its input and output queues
• resets its command parser (so it is ready to receive a new program
message)
• cancels any pending *OPC command or query
The command does not affect the following:
• front-panel operation
• any analyzer operations in progress (other than those already
mentioned)
• any analyzer settings or registers (although clearing the output
queue may indirectly affect the status byte's MAV bit) passed
Serial Poll
The analyzer responds to both of the serial poll commands. The Serial
Poll Enable (SPE) command causes the analyzer to enter the serial poll
mode. While the analyzer is in this mode, it sends the contents of its
status byte register to the controller when addressed to talk.
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key which allows a front-panel operator to return the
Programmer's Guide