Tunnel - An advanced example for reading 2 serial devices using a single modem/SIM and simultaneously using GPRS connection and GSM calls. There is additional serial tunnelling when there are no GSM/GPRS
PLC Raspberry PI - Controlador Industrial
Mini-PLC PL-100 | VMC
WP240-GPRS - OVERDIGIT EN
Modbus RTU (RS485) controller with GSM modem - EM-486
Ipack
USB GSM programmable modems India
Módem GSM Lovato para control remoto vía SMS EXCGSM01
MODEM MODEM DTU Es Compatible Con Transferencia Transparente SMS Con Puerto RS485 Para Medidor Inteligente PLC GSM / GPRS / Sistemas De Alarma 3G / 4G De 113,49 € | DHgate
END OF LIFE : PLC MAX H04 con GSM communicator (SMS, CLIP) + Display, tasti