... GSM SMS Modem With English SMS receiving, sending to one party or sending to multi-parties. Specifications of TM100 GSM Data Transmission Unit (DTU) Key words: GSM SMS Modem, SMS ... SMS, Balance notice, Give regards to customers Others: Medical organizations, government, enterprise, after-service department, etc. With standard RS232 ... Card: 1.8V, 3V;l InterfaceRS232: serial data rate of 1,200~115,200bits ...