Amazon.com: USR-G771-E RS232/RS485 to LTE CAT 1 Cellular Modem Support LTE and GSM TCP UDP Transparent Transmission with SIM Card Support HTTP, MQTT, SMS (Modbus RTU to TCP Version NO Adapter)
GSM Modem Wavecom Q2303A Module COM RS232 AT Commands | eBay
BQ140 RS232 GSM-GPRS Modem - BQTEK
Serial Port RS232 Interface AT COMMAND Support Gsm Gprs Modem - AliExpress
RS232 modem - All industrial manufacturers
Modem GSM/GPRS, Robustel GoRugged M1000 MP, interfață RS232, comenzi AT
Source serial port rs232 rs485 industrial gsm gprs modem for AMR PLC on m.alibaba.com
Industrial Cellular Modem Serial Port Wireless RS232 RS485 GSM GPRS to GSM GPRS USR-GPRS232-730 Data Transparent Transmission - AliExpress
USR GPRS232-730 GSM Modem RS232/485 | Serial GSM Modems | IOTNVR US
Industrial 5G 4G 3G Router and Modem | Wlink-Tech
GSM/GPRS MODEM -SIM900 – RS232 (RMC)
Embedded Works - Gemalto BGS2T-RS232 Modem: Indoor Rated 2G GSM / GPRS | Embedded Works
Amazon.com: OSTENT GSM Modem with Wavecom Q2303A Module COM/RS232/Serial Port at Commands SMS Voice Call AU Plug Power Adapter