... interface for voice transmission, SMS and data transmission, supporting RS232 serial port MD260 is a GSM 900/1800 or 850/1900 ... interface for voice transmission, SMS and data transmission, supporting RS232 serial port. It meets all the demands for developing GSM/GPRS ... .Embedded TCP/IP stack (optional).InterfacesRS232 (V.24/V.28) Serial interface supporting:? Baud rate (bits/s): 300, 600, 1200, ...