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TLS5 User Manual
TLS5-UM-00001 Rev 002 27
Implemented Status Structures
TLS Tunable Laser Source has the following status data structures implemented:
•
IEEE 488.2 defined standard registers (standard status structure)
The 488.2 standard status structure consists of four registers:
•
status byte register
•
service request enable register
•
standard event status register
•
standard event status enable register
Note that the standard event status register and the event register are both
“sticky” ( i.e. once their bits are set to 1 they remain set until they are cleared by
appropriate commands). The status byte register and the condition register are
both dynamic and get updated when the state of the instrument or the
underlying status structures change. Refer to IEEE488.2 and SCPI1999
documents for further details.
Status Byte Register
The status byte register contains the summary bits for each of the structures
implemented in the meter, the master summary bit (MSB) and the request for
service bit (RQS).
•
Bit 0 to Bit 3 are not used.
•
Bit 4 (message available) is set to 1 when a response message is available in
the output queue.
•
Bit 5 (event summary bit) is the summary bit for the standard event status
structure. The ESB summary message bit is set if any bit in the standard
event status register is set while its corresponding value in the standard
event status enable register is set.
Status Register
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
(OSB)
not
used
request for
service
or
master
summary
event
summary
(ESB)
message
available
(MAV)
(QSB)
not
used
not
used
not
used
not
used
Read with By serial polling
*STB?
Written to with
Cannot be written to
Cleared by *CLS common command