Computer Aided Transceiver

I am writing a controller program for my amateur transceiver to include in an existing VBapp. They communicate via a null serial cable and in hex. The transceiver manual states to send a 5 byte string where the last byte is the opcode. ie to commence CAT operations send 00 00 00 00 01. Unfortunately that is all it says, and I have seen no code examples for this, so the syntax is a little beyond what I have seen before... ## Deliverables Just the source code is all... ## Deadline information A simple job I'm sure, but one I am happy to pay for! There are complete commercial products available.