Modbus

The Modbus® Protocol was introduces in the 1970s which has now become one of the most widely used protocols in the Building Management industry.

The Airedale controllers are able to communicate directly using the Modbus® protocol. The Modbus® card is a small PCB (60mm x 30mm), which can be plugged into the controller to provide it with the following protocol support:

• Modbus®—JBus slave
• RTU mode (Remote Terminal Unit) with 8 bit encoding and error handling using 16 bit CRC
• Communication standard connection options of RS485 (multipoint) or RS232 (point-point)
• Maximum Baud Rate of 19200

The data communication is asynchronous serial, 8 data bits, 2 stop bits and no parity (in total 11 bits/datum). The data/parameters from the controller is represented within Modbus® registers, each register containing information pertaining to temperatures, pressures, setpoints, status, etc and is available to the site integration company in a spreadsheet format.

For more information click here.