Skip to content

System Overview

An overview of the components of the W-Modbus module is shown in the image below:

Module Overview Block diagram of a W-Modbus module (MWA-N2)

  • The RS485 pins are used to connect Modbus devices to the module.
  • The SPI or UART management interfaces provide means to communicate with the W-Modbus device, and to configure its RS485 communication parameters.
  • The push button can be held while powering on the device to put it into DFU/bootloader-mode. It is also possible to pull the bootloader/button pin high to 3.3V while powering on the device. However, it is also possible to enter this mode using the SPI or UART management interfaces (without having to manually power on or off the device).

MWA-N3 modules (the image above shows an MWA-N2) have an internal antenna that is used by default, but an external antenna can be selected by configuring the ANTENNA_SELECTOR using either the SPI or UART management interfaces.

MWA-N2 modules do NOT have an internal antenna, thus the external antenna is selected. The external antenna port uses an IPEX/U.FL connection that provides the range when communicating with other devices on the network. The module should be powered with 3.3V.

Back to top