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Using GPIB, RS-232
D-4 GB1400 User Manual
Service Request Enable
Different conditions for a service request can be individually enabled. The Service
Request Enable byte contains the enabling bits for the status byte. For a service
request to occur, either the TSB, MAV or ESB bit must be enabled. Each time
the GB1400 is powered on, this byte is RESET so that no bits are enabled. The bit
definition is the same as the status byte, except bit 7 is undefined.
Service Request (SRQ)
The status byte enables the creation of a service request. Whenever a condition
requiring service from the controller occurs and is enabled, the SRQ line is set. It
is reset after the controller finishes a serial poll of the GB1400 receiver, or when
all of the enabled service request conditions have stopped.
Standard Event Status Register
The ESB bit is the summary of the Standard Event Status Register. This byte has
an enabling byte similar to the Status Byte. Individual bits within the Standard
Event Status Register represent the different possible causes of a Standard
Event. The bit definitions for the Standard Event Status Register are as follows:
Bit 1 Operation
Complete
Only set following an *OPC command
Bit 2 Request Control Not Used
Bit 3 Query Error Set under the following conditions:
• when output has been requested from the
GB1400 and none is available
• when a command is sent to the GB1400 and
GB1400 still has a message available
• when output has been requested from the
GB1400 and an unterminated command has
been set to the GB1400
Bit 4 Device
Dependent Error
Set under the following conditions:
• when input data is lost over the interface
• when the input buffer overflows due to a too-long
command line without a terminator
Bit 5 Execution Error Set under the following conditions:
when a command parameter is out of range
when the command has too many or too few
parameters
when the command cannot be properly executed
due to a device condition
Bit 6 Command Error Set whenever the GB1400 receives an unrecognized
command, or invalid GPIB command
Bit 7 User Request Not used
Bit 8 Power On Set whenever the GB1400 is powered on