The following quick tips will help you get started using the new Monnit Serial MODBUS Gateway. The Monnit Serial MODBUS Gateway acts as a data concentrator for Monnit wireless sensor networks incorporating Monnit’s Access Point Node (APN) with Serial RS-232C and RS-485 Interfacing hardware.

Connecting to the Serial MODBUS Gateway.

When connecting the Serial MODBUS Gateway to your existing system, please refer to the following diagram to ensure you are connected correctly.

  • Red Wire: 4.5 – 36 VDC
  • Black Wire: Power Ground
  • Orange Wire: Transmit Signal
  • White Wire: Signal Ground
  • Green Wire: Receive Signal

Connecting to the SMG

Performing a Factory Reset

To reset a Monnit Serial MODBUS Gateway to factory settings, follow these steps.

  • Unplug the power from the gateway.
  • Open the unit be removing the 4 screws from the bottom of the enclosure.
  • Locate the “COM Reset” prongs.
  • Attach the provided black jumper across the COM reset prongs.
  • Power up the gateway.
  • With power on, remove and replace the jumper twice.
  • Un-power the gateway and remove the jumper.
  • Put enclosure back together, secure with the 4 screws.
  • Power up the device and return it to operation.

For more information on using the Monnit Serial MODBUS Gateway or wireless sensors, visit the support section of our website.