The Modbus application (Sensit.App.Modbus) allows the user to communicate to devices that support Modbus ASCII or Modbus RTU over a serial port.

User Manual

Hardware

A serial port is required, along with a device that communicates via Modbus ASCII or Modbus RTU.

Serial Port

After starting the app, select the serial port, baud rate, parity, number of stop bits for the serial port. Also select the desired Modbus mode (ASCII or RTU). Then click Open to open the serial port.

Device Address

Type the Modbus address that should be used to communicate with the device. There are two text boxes for this setting. The one marked "0d" is for decimal numbers, and the one marked "0x" is for hexidecimal numbers. Type in either one, and the other will automatically adjust to reflect the new value.

Data

This section of the app allows you to read and write to any Modbus Coil, Discrete Input, Input Register, or Holding Register. There is a different tab for each type of data.

When you are finished using the app, click the Closed button to close the serial port. Alternatively, the port will also be closed when the app is closed.