I don't believe you are using CMR if you are connecting to an F9P.  It can only output RTCM and even then the available messages are not complete for a Trimble receiver so the owner is probably injecting a 1008 message into it (using STRSVR possibly).  What are you using for a modem and where is it connected into the system?  I'm using Port B on the 372 and in the RDI I have Port C setup for the RTCM stream.