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Scenario details:
- We need to monitor remote ModBus RTU devices with the RS485 port from a central Server which has a software application to control ModBus TCP. MTX-Tunnel will create a ModBus TCP/ModBus RTU GPRS gateway
- ModBus remote devices need to be available at all times, so the modem connected to those devices is permanently connected to the GPRS waiting for incoming requests in the standard ModBus TCP port number 502
- SIM cards provisioned with fixed IP addressing will be used, but we could also use dynamic IP addresses and DynDNS or our own DNS server in the same way
Solution: MTX-Tunnel firmware + MTX-Java-IoT/MTX-Java-T/MTX-Java-T2
Config.txt configuration file:
Configuration | Observations |
COMM_baudrate: 9600 COMM_bitsperchar: 8 COMM_autocts: off COMM_autorts: off COMM_stopbits: 1 COMM_parity: none GPRS_apn: internetestatico.movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 0 MTX_PIN: 0000 MTX_model: 199801436 MTX_mode: server MTX_urc: off MTX_gatewayModBus: on MTX_invertedCom: on TCP_port: 502 FIREWALL_enabled: off |
Serial port baud rate 8 bit data No flow control No flow control 1 stop bit No parity GPRS APN from your network operator GPRS Login GPRS Password MTX-Tunnel is always GPRS connected If SIM card has no PIN security, use 0000 value MTX-Terminal modem model used TCP server mode URC messages will not be sent ModBus TCP – ModBus RTU gateway enabled Main port (for GPRS-Serial gateway) TCP port used. Standard ModBus Any incoming connection form any IP is allowed |