NTI ENTERPRISE ENVIRONMENT MONITORING SYSTEM18Serial GSM ModemTo use a serial modem (ENVIROMUX-16D/-5D only), connection of the modem to the ENVIROMUX requires a CAT5 patch cableand RJ45-to-DB9 male adapter (supplied). The modem connects to the “RS232 AUX” port. The firmware in the ENVIROMUXmust be version 1.3 or later.Operation and use of the modem will be the same as that of the USB GSM modem. Once installed, the ENVIROMUX will sensethe modem and provide status information on the “Enterprise Setup” page (page 58).Up to 1000 feet of CAT5E (350Mhz) cable may be used at a baud rate of 115,200bps.Serial Modems Tested Include:• Sierra Wireless Airlink MP895• Four-Faith F1103 (NTI# ENVIROMUX-GSM-IND)• MultiTech MTCBA-G-F2• Enfora GSM1308• Teltonika ModemCOM/G10CT6488 AdapterDB9 Male to RJ45 Pin AssignmentsRJ45 Signal DB9M Signal1 RTS Connected to 8 CTS2 DTS Connected to 6 DSR3 TxD Connected to 2 RxD4 GND Connected to 5 GND5 GND Connected to 1 DCD6 RxD Connected to 3 TxD7 DSR Connected to 4 DTR8 CTS Connected to 7 RTSThe “AUX PWR” terminals ofthe ENVIROMUX-16D maybe used to power the modemprovided the modem doesnot require more than 150mAto operate.The AUX PWR terminals onthe ENVIROMUX-5D willsupply up to 500mA.The “RS232 AUX” portcan also be used tocontrol a remote RS232device. See page 22for more on this feature.
