Modbus RS485

Modbus/RS485 is a popular serial protocol to read various sensors. YuDash NUREX is being used to read a variety of instruments, sensors and PLCs for various applications. NUREX provides easy to configure approach for reading field Modbus instruments. Following are the key information points required for a successful read of instrument through Modbus:

1. Baudrate

2. Data Bits, Parity and Stop Bit

3. Slave ID of instrument

4. Modbus register information to read:

   1. Modbus register numbers and types)

   2. Modbus register data types (Size: integer/float/real. Byte swapping information: LSB/MSB etc.)

5. Modbus register address.

Modbus Register Mapping in YuDash NUREX.

Various Modbus topologies are covered in Modbus protocol documentation.

Modbus/RS485 interfacing example

YuDash NUREX datalogger is connected with Selec EM2M energy meter on Modbus channel#1

Modbus/RS485 interfacing example (2channels)

YuDash NUREX datalogger is connected with Selec EM2M energy meter on Modbus channel#1 and XY-02 temperature and humidity sensor on Modbus Channel#2.