CL3-E CANopen/USB/Modbus RTU Online Manual

Configuring via Modbus RTU

Described in the following chapters is how you can establish the communication.

The controller is set at the factory to slave address 5, baud rate 19200 Kbaud, even parity, 1 stop bit.

Communication settings

The following settings can be performed:

Configuration Object Value range Factory settings
Slave address 2028h 1 to 247 5
Baud rate 202Ah 7200 to 256000 19200
Parity 202Dh
  • None: 0x00
  • Even: 0x04
  • Odd: 0x06
0x04 (Even)
The number of data bits is always "8" here. The number of stop bits is dependent on the parity setting:
  • No parity: 2 stop bits
  • "Even" or "Odd" parity: 1 stop bit

The following baud rates are supported:

  • 7200
  • 9600
  • 14400
  • 19200
  • 38400
  • 56000
  • 57600
  • 115200
  • 128000
  • 256000

Establishing communication

  1. Connect the Modbus master to the controller via the RS-485+ and RS-485- (see X7 − CANopen/RS-485 IN) or RS-232-Tx and RS232-Rx (see X4 − RS-232 connection) cables.

    If using RS-485, mount jumpers J1 and J2 in the correct position (see RS-485 setting).

  2. Supply the controller with voltage.
  3. Change the configuration values if necessary.

    The controller is set at the factory to slave address 5, baud rate 19200 Kbaud, even parity, 1 stop bit.

  4. To test the interface, send bytes 05 65 55 8A AE to the controller (you can find a detailed description of the Modbus function codes in chapter Modbus RTU).
    The object dictionary is read out.
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