When using the Modbus connector of Vortex Edge Connect with the Vortex Edge Smart Gateway, you may wish to use a Modbus RTU device. The lower serial port labelled “OIO” of the Vortex Edge Smart Gateway supports both RS232 and RS485 serial modes. The serial mode is selected via a BIOS setting. The following steps detail the process of connecting a Modbus RTU device to the Vortex Edge Smart Gateway.
Steps to connect the Modbus RTU device to the Vortex Edge Smart Gateway
First wire up your Modbus RTU device as specified in it’s manual, ensuring that the wiring is compatible with the Vortex Edge Smart Gateway. The following image and table shows the pin layout of the “OIO” COM port of the Vortex Edge Smart Gateway:
"OIO" COM Port Pin Assignment
| Pin | RS-232 | RS-485 |
|---|---|---|
| 1 | Not Connected | 485DATA- |
| 2 | RXD | 485DATA+ |
| 3 | TXD | Not Connected |
| 4 | Not Connected | Not Connected |
| 5 | GND | Not Connected |
| 6 | Not Connected | Not Connected |
| 7 | RTS# | Not Connected |
| 8 | CTS# | Not Connected |
| 9 | Not Connected | Not Connected |
Next connect your Modbus RTU device to the lower serial port of the gateway labelled “OIO”. Hold the F2 key and power on the gateway to enter the BIOS. Once in the BIOS, use the right arrow key to move to the “Advanced” tab. Press the down arrow key to move to “Baytrail Features Configuration” and press enter.
Next press the down arrow key to move to “LPSS HSUART #1 Support”. To modify the value press enter. This should be set to “Enabled”. Press enter to confirm your selection. Next move to “HSUART Port Mode” and press enter to modify the value. Select the serial mode you wish to use for your Modbus RTU device and press enter to confirm:
Next press escape and then use the right arrow key to move to the “Save & Exit” tab. Press enter on “Save Changes and Exit” and then press enter again to confirm and reboot. You should now be able to configure the Vortex Edge Connect Modbus connector to connect to your Modbus RTU device as detailed in the “Modbus Connector” section of the user guide. By default, the “OIO” serial port is accessible on /dev/ttyS4 on an installation of the Vortex Edge Smart Gateway image.
