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Programming Guide – 29
OPC? Operation Complete
Returns the status of the input buffer.
• 1 = the input buffer is empty, for example, all commands have been executed
• 0 = the input buffer is not empty, for example, commands are still pending
IDN? Identifier
Returns a string that identifies the manufacturer, the switch series, and the firmware level, for
example, JDS Uniphase, SB Switch, 2.00
Status Reporting and Service Request Control
The SB switch maintains three eight-bit registers that are used for status reporting and for
enabling the GPIB service request interrupt:
• Condition register
• Status register
• SRQ mask register
Condition Register
The condition register monitors the current state of the switch mechanism ( Table 9). Bit 2, the
settled condition bit, is 1 when the switch mechanism has stopped at the desired channel and
0 when the switch is moving to a new output channel. The CNB? query command returns the
value of the condition register. When the settled bit is true, CNB? query returns 4.
Table 9: Condition Register
Condition Register
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 0 0 0 settled 0 0
Status Register
The status register records errors and other events that have occurred in the switch (Table 10).
When an event occurs, the switch status logic sets the corresponding bit to 1. The status
register can be read at any time because the bits stay set until the register is read at least
once.
Table 10: Status Register
Status Register
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
self-test service syntax message 0 settled 0 parameter