... 3.With TCP/IP stack 4.PPP,TCP, UDP RS485 GSM/GPRS Modem Product descriptionIndustrial designAluminum casingWireless access to internetBased ... memory 32MB, PSRAM 16MB850/900/1800/1900MHZ3V SIM card slotRS485 interface:PIN 1 for 485+BPIN 2 for 485 -ASIM ... degrees -+70 degreesSize 76*54*25mmWeight 100gAccessories: AC/DC adaptor, RS485 cable, antenna, 2 mounting plates, CD Specification for dataGPRS ...