Experimental Physics and
Industrial Control System

If this is running on an operating system that has the PCRE library, you can enable the streams regex converter 

http://epics.web.psi.ch/software/streamdevice/doc/setup.html

This will allow you to find and replace substrings before the string gets outputted. Unfortunately, the result looks a bit ugly:

I have a TC-720 temperature controller that needs to receive an hexadecimal checksum:

Protocol file: 

(...)

The output was:

*5900002E\r

The problem is: that final "E" must be "e" lowercase, or the equipment return an error code. How can I make <sum> output a lowercase character?

Thank you,