Swept-Wavelength Tunable Laser Source
™
Computer Control • 49
Laser-Controller Responses
All commands evoke a response from the driver (set commands return
an “OK” when executed). If you are using RS-232, the response is sent
immediately; with IEEE-488 and Ethernet, the response is loaded into
the output buffer (a first-in, first-out buffer with a capacity of 5
messages).
•
Laser-controller responses are sent differently depending on the
interface you are using.
IEEE-488: responses are written into the output buffer — a first-in
first-out (FIFO) buffer with a capacity for 5 outgoing messages. You
will need to send a separate command to read the response from
the buffer.
RS-232: responses are sent immediately and can be processed or
ignored. Responses are terminated with the <CR> character (0x0c).
Ethernet: responses are written into the output buffer — a first-in
first-out (FIFO) buffer with a capacity for 5 outgoing messages. You
will need to send a separate command to read the response from
the buffer.
•
The controller does not echo commands.
•
When the controller is first turned on, all computer-control
commands other than OPC? will receive the response “Initializing.”
•
The controller returns “OK” for properly executed set commands.
•
If unable to carry out a command, the controller will use one of the
following responses:
•
“Out of Range” if sent a value outside the allowed range.
•
“Unknown Command” if the command is not recognized.
•
“Initializing” if the system is booting up.
•
“Operation not complete” if the laser is performing a long-
term operation (e.g. turning on the diode or scanning).
•
“Can’t scan in TRACK mode” if you try to initiate a scan while
the laser is in track mode.
•
“Not in interactive step mode” if you try to initiate a step while
not in interactive step mode.
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