WM Systems - Innovation in Smart IoT Systems M2M Modbus RS485 IO : WM Systems LLC – Innovation in Smart IoT systems

Wireless modem
GPRS access
SCADA connection
RS485 port
Product code:
Modem Plus RS485 IO

C-rail mountable industrial 2G modem for receiving or collecting signals of digital inputs or impulse signals of meter systems.

The modem is capable of counting the impulse signals of 1 to 4 meter systems and transmitting them on GPRS (or on ftp by pre-defined intervals).

It also has an RS485 connection for PLCs (register readout) or M2M IO/RS485 CONCENTRATOR®.
The device can transmit data by Modbus TCP protocol. It is able to answer Scada server’s Modbus TCP requests and periodically replies to them (as Modbus RTU).


• GPRS data sending (Gemalto® module)
• RS485 connection (PLC/Scada/Data concentrator)
• 4 inputs (digital or pulse/voltage)
• 2 relay outputs (optional)


• Modbus protocol communication / Modbus Gateway mode
• Consumption meter compatibility (receiving and counting pulse signals)
• Configuration software (on RS232 or RS485 port)
• 2MB Flash memory for local storage, ftp relay
• IO-expansion (receiving contact/voltage/impulse signal)
• Remote firmware upgrades (ftp server)


• External battery connection  (spare power supply)
• Watchdog circuit and system monitoring, log
• Automatic mobile network connection recovery



  • Data collection (digital or pulse signal)
  • Forwarding data of industrial systems
  • Scada connection
  • Smart metering (remote readout)
  • Remote monitoring of devices
  • Remote relay control

Industrial design

Industrial standard connection and outfit, solid metal casing.
Watchdog and system monitoring.
Rechargeable external battery connectivity.



The modem can connect to 1-4 consumption meters through the IO-port.
PLC/Data concentrator connection on RS485.



The modem has intermittent Modbus TCP/RTU communication and wireless GPRS data transmission capabilities.

Services and usage

• Communication monitoring and logs
• Stable IP connection with auto network recovery
• Modbus communication (TCP master/RTU protocol)
• Readout of PLC registers
• Modbus TCP client/Scada server connection possibility


Technical data


Pay attention to the following products



Data concentrator module with 32 digital inputs and Modbus RTU communication


M2M Router

Professional, industrial IoT router with choosable wireless modules (CDMA 450, 3G, 4G, LTE Cat.4/Cat.1, Cat.M, Cat.NB) and port expansion options



CDMA 450 / 2G / 3G / 4G / LTE-M / Narrow Band modems for Honeywell / Elster Alpha A1500, A1700, A1800 and the A1140/A1160 electricity meters


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