Amazon.com: Teltonika W03660 Model RUT955 4G/LTE Router, Dual Sim, Global Navigation Satellite System, Compatible with Teltonika Remote Management System; for use with AT&T, Verizon, and T-Mobile : Electronics
What options do I have to work with Modbus?
RUT955 RS232/RS485 (legacy WebUI) - Teltonika Networks Wiki