RV55 vs Rv50 Pinout Pin2 and Pin3

RV-55 User Guide lists Serial Connector Pinout PIN 2(RECV) and PIN3(TRNSMT) . Is this truly reversed from RV-50, LS-300, and older modems ? or is it a typo in the RV-55 User Guide? Having issues with this RV55 modem for serial passthrough replacements of older 3G modems RavenXT and LS300s.

Hi @melissa.baldwin
Welcome you to our community

For serial port pins on RV55 Airlink and RV50 Airlink, please refer to the two documents following to the link below: