GPIB
4-8 370B User Manual
Service Request (SRQ). The Service Request (SRQ) line is set by the 370B each
time it has a change in status to report to the controller.
Serial Poll Enable and Disable (SPE and SPD). The Serial Poll Enable (SPE)
message (ASCII Control X, decimal 24) causes the 370B to transmit its
serial-poll status byte when it is talk addressed. The Serial Poll Disable (SPD)
message (ASCII Control Y, decimal 25) switches the 370B back to normal
operation.
End or Identity (END or EOI). The 370B or controller sets End Or Identify (EOI)
simultaneously with the last byte of the command or data if LF (line feed) /EOI
is currently selected as the message terminator. If LF alone is selected, the
message terminator is LF accompanied by EOI and followed by a CR (carriage
return).
Local Lockout (LLO). When a Local Lockout (LLO) message (ASCII “Control 0”,
decimal 17) is received, the 370B enters the Lockout state.
. The 370B has no front panel Lockout indicator to indicate when Lockout
is set. Once set, all subsequent inputs from front panel keys with corresponding
remote commands will be ignored.
Device dependent messages for the 370B are in three categories: commands and
queries, setup data, and measurement data.
Commands and Queries. Commands are sent to the 370B to initiate some action
or change its settings. Some commands may be as short as three characters.
Other more complex commands may be much longer.
A notable subcategory of commands is that of query commands or queries. The
370B responds to a query by sending another device dependent message back to
the controller. This response communicates the appropriate instrument status,
settings, or measurement data. These messages may also vary from a few
characters to many characters in length.
Device Dependent
Messages
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General