Experimental Physics and
Industrial Control System

I am trying to write a StreamDevice protocol file for a Thorlabs SC10 shutter Controller and have struck a problem.

 

The protocol to obtain eg. “data” is to send the string “data?”. The device then responds in three steps:

* echoes the request string “data?” followed by a terminator (CR)

* provides the current value (0 or 1) followed by a terminator (CR)

* sends back a prompt string“> “ BUT WITH NO TERMINATOR

 

I can handle the first two steps:

 

TERMINATOR=CR

getData {

   out “data?”; in “data?”; in “{0|1}”;

}

 

How do I best handle parsing the trailing characters of the prompt string “> “ which is not terminated?

 

I will be polling the device for multiple pieces of data.

 

Thanks in advance,

 

Dr Mark Bennett

Principal Controls Engineer

Australian Synchrotron