CryoTel GT Cooler: different startup and shutdown StreamDevice protocols

[boj via Tech-talk <tech-talk at aps.anl.gov>]

Dear all

I am implementing a StreamDevice based IOC for a "CryoTel GT Cooler", 
which in general is very easy to communicate with, but has some strange 
behaviors for
the startup and shutdown commands.

I need to send one of the following commands:

SET SSTOP=1

or

SET SSTOP=0

However, the response is different in the two cases.

I think a "BO" record, should be used, but is there anyway I can have 
different protocol definitions for the "1" and "0" state?
Alternatively, is there an easy way to separate this into two records?

Thanks in advance

    Bo