Ordinarily you’d be correct with Tx goes to Rx and vice versus if cabling from receiver to screen. However in this case the OP was making an adapter cable to swap the 372 receiver with a Novatel receiver. Therefore in his wiring convention Tx should by rights go to Tx and Rx should go to Rx (unless of course Trimble and NovAtel have different data direction conventions for a Tx pin for example). In any event a quick swap of the Tx and Rx was tried I believe but to no avail. It’s more than likely a baud rate mismatch - but this requires a bit of laptop work with some terminal software to reprogram the NovAtel baud rates.