Configure Modbus Slave Device Communication Settings
The configuration Form of a Modbus Slave Device item includes a Modbus tab.
Use the Communication section of the Modbus tab to configure the settings to allow the SCADAPack x70 to communicate with the Modbus Slave.
Use this combo box to select the protocol used by the communication link between the SCADAPack x70 device and the Modbus Slave device. Select from the following options:
- Modbus RTU serial—Enabled only when you select the Modbus RTU Master option in the Device Configuration Options section of the Settings tab. The tab is on the Form of the SCADAPack x70 Device Configuration item with which this Modbus Slave device is associated.
The following options are enabled only when you select the Modbus IP Clients option in the Device Configuration Options section of the Settings tab:
- Modbus/TCP (Transmission Control Protocol)
- Modbus RTU over TCP
- Modbus RTU over UDP
This field is only available if you selected Modbus/TCP for the Device Type. Use the spin box to specify the Modbus/TCP Server device address. The address needs to be within the range 1 to 255.
This field is only available when the Device Type is set to 'Modbus RTU serial', Modbus RTU over TCP, or Modbus RTU over UDP.
Use the spin box to specify the device address of the Modbus RTU Slave. The address needs to be within the range 1 to 255 inclusive. It also has to differ from the Modbus Station Address that is configured on the serial port to which this device is connected (see Port Function - Modbus).
Device addresses above 247 are non standard Modbus extended addressing.
This field is only available if you selected Modbus/TCP, Modbus RTU over TCP, or Modbus RTU over UDP for the Device Type. Specify the IP address of the Modbus Slave.
This field is only available if you selected Modbus/TCP, Modbus RTU over TCP, or Modbus RTU over UDP for the Device Type. This allows you to define the port on which the Modbus Slave device listens, and to which communications from the SCADAPack x70 are sent. The default values are 502 for Modbus/TCP, and 49152 for Modbus RTU over TCP, and Modbus RTU over UDP.
This field is only available if you selected Modbus RTU serial for the Device Type. Use this combo box to specify the serial port that the SCADAPack x70 device is to use to communicate with the Modbus slave device. You need to ensure that the Port Function of this port is set to Modbus (see Port Function - Modbus).