Before Programming; Nomenclature; Program And Response Messages - THORLABS ITC502 Operation Manual

3.2 Before Programming

3.2 Before Programming

3.2.1 Nomenclature

Program messages (PC ⇒ ITC5xx) are written in inverted commas:
Response messages (ITC5xx ⇒ PC) are written in brackets:
There is a decimal point:
Parameters are separated with comma:

3.2.2 Program and response messages

Blocks of message data are transferred between the controller and the ITC5xx during
communication. Messages sent from the controller to the ITC5xx are called program
messages, and messages sent back from the ITC5xx to the controller are called
response messages. If a program message contains a query command, i.e. a
command which requests a response, the ITC5xx returns a response message.
Program messages
With program messages, settings are effected (command) at the ITC5xx and
response messages are selected (query). Program messages can be separated with
semicolon. All program messages are executed sequentially (one by one).
Examples:
":MODE CC"
"*IDN?"
":LDPOL CG;:PDPOL AG"
Response messages
With response messages, measurement values and status information is transferred
to the PC. All response messages are generated when the query (program message)
is parsed.
Example:
[:ILD:ACT 7.123456E-05]
ITC500 / page 62
select the mode
(command)
request the identification (query)
select the laser diode polarity and the
photodiode polarity.
measure the actual laser current
"*IDN?"
[MODE CC]
1.234
"PLOT 2,0"
"constant current"