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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
USR-G771-E | USR IOT LTE CAT Serial Cellular Modem| 355525
RS232 modem - IB PSTN III - Bausch Datacom - RS485 / PSTN / industrial
GSM Modem RS232/485 | Serial GSM Modems
InduBox GSM/GPRS IX (IB GSM/GPRS IX) - Bausch Datacom - PDF Catalogs | Technical Documentation | Brochure
LINOVISION Rugged and Versatile Cellular Router & 4G DTU with RS232, Industrial 4G LTE WiFi Router with Dual SIM Cards Slot | LINOVISION US Store
GSM Modem RS232/485 | Serial GSM Modems
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GSM-4GLTEGPS Rf Solutions, GSM Modem, 4G/LTE with GPS, RS232/USB Interface | Farnell Belgium
SR2MOD02 - GSM modem interface, Zelio Logic, for communication interface SR2COM01 | Schneider Electric Canada
L30960-N2700-A100 Telit Cinterion | RF and Wireless | DigiKey
GSM Modem RS232/485 | Serial GSM Modems
Modem GSM voice and GPRS (RS-232) 900/1800 - Cablematic
Industrial 4G LTE Router with Virtual SIM, eSIM Router Supports RS232/ | LINOVISION US Store
GSM Modem RS232/485 | Serial GSM Modems
M1200 | 4G LTE Gateway | 4G Modem | Robustel
Modem 4G WiFi+Routers RS232 GSM GPRS Modem Support VPN Industrial One SIM 4G WiFi Router - China 4G Lte Router and WCDMA 3G Router price | Made-in-China.com
GPRS modem - DB GSM M4 - Bausch Datacom - RS232 / RS485 / GSM
GSM / GPRS expansion module | Industruino
Modem GSM voice and GPRS (RS-232) 900/1800 - Cablematic
Modem GSM voice and GPRS (RS-232) 900/1800 - Cablematic
Gsm Modem F1003 SMS/CSD Function With Serial Port| Four-Faith
Industrial Wireless RS232 Serial GSM GPRS Modem with SIM Slot - AliExpress
