Comtech EF Data SFC4200 - Manual (Page 3)

Latest Software Revision Confirmation
When new features are added to Radyne ComStream Corporation
equipment, the control parameters are appended to the end of the
Non-Volatile Section of the Remote Communications Specification,
and status of the features, if any, are added at the end of the Volatile
Section. If a remote M&C queries two pieces of Radyne ComStream
Corporation equipment with different revision software, they could
respond with two different sized packets. The remote M&C MUST
make use of the non-volatile count value to index to the start of the
Volatile Section. If the remote M&C is not aware of the newly added
features to the product, it should disregard the parameters at the end
of the Non-Volatile Section and index to the start of the Volatile
Section.
Before creating any software based on the information contained in
this document, contact the Radyne ComStream Corporation Customer
Service Department (602-437-9620) to find out if the software revision
for that piece of equipment is current and that no new features have
been added since the release of this document.