Modbus TCP to RTU Gateway
Model: G-MTR-1E2R
The Gateway has one ethernet port and two RS485 ports, which allow it to connect to two different networks of Modbus RTU RS485 devices. It enables bidirectional communication between SCADA or TCP Modscan clients and these devices. It translates Modbus TCP requests and responses to and from Modbus RTU for each network.
- Description
- Specification
The Gateway Routes the requested modbus TCP request messages from a Modbus TCP client (any SCADA system / TCP Modscan application) to Modbus RTU RS485 devices and get the replied messages from RS485 network then forward to the requested TCP client
- Flexible deployment via auto IP address with built in web-configuration.
- 1 Ethernet port, and 2 x RS485 ports.
- Support fixed IP address routing and routable TCP port selection with respect to corresponding RS485 ports.
- Support 512 concurrent TCP requests .
- Support selectable baud rate, stop bit and flow control for RS485 device networks.
⚠️ Caution:
Only use the Ethernet port, two RS-485 ports, and power supply port as indicated on the device sticker
Do not connect to any other ports as this may cause operational issues or damage.
Guide
Step 1: Connect the Gateway
Connect the Gateway directly to your computer using the Ethernet port (RJ45 port).
Step 2: Configure Your Computer's Network Settings
On your computer, open the network configuration settings. Select DHCP (Dynamic Host Configuration Protocol) so that your computer can automatically detect the IP address of the Gateway.
Figure-1. Open Control Panel
Figure-2. Open Network and Sharing Center
Figure-3. Open Ethernet
Figure-4. Properties -> IPv4 -> Obtain an IP address automatically
Figure-5. Check details
Or once you've determined the IPv4 Default Gateway, you can assign a static IP address to your computer as follows:
Step 3: Configure the Gateway
Use a browser (Chrome is recommended) to open the IP address you identified earlier (e.g., 192.168.0.10).
Figure-6. Login by provided account
After logging in, the built-in web configuration will open, and you can begin setting up the Gateway.
3.1 - Ethernet Settings:
In this section, you can modify the Gateway's IP address. This address serves dual purposes:it acts as the DNS/DHCP Server for web configuration, and as a DHCP client mode when connected to a LAN switch or router simultaneously.
Please be aware that altering the IP address will necessitate a reload and reconnection to the Gateway.
Figure-7. Click on the Ethernet Settings icon
Figure-8. Change IP Address for the Gateway
Figure-9. Reload the page and login again
3.2 - Modbus Settings:
Given that we have two RS-485 ports, we provide the configuration to set up two pairs independently.
The gateway will automatically start running upon power-up if at least one pair is enabled.
Figure-10. Gateway is running, hit to stop
Figure-11. Gateway is stopped, hit to start
Figure-12. Pair 2 setting
Figure-13. Pair 1 setting
Figure-14. Enable pair 1 and save
Please note that if the Modbus configuration changes, the gateway will stop. You will need to press the "Run" button to restart it.
Step 4: Connect the RS485 Devices
Connect your Modbus RTU RS485 devices to the RS485 ports on the Gateway.
Step 5: Test the Connection
Use a Modbus TCP client to send a request to the Gateway and verify that it is correctly translated to Modbus RTU.
Figure-15. Modscan works as Modbus TCP Client
Figure-16. Modbus RTU Slave
Step 6: Connect the Gateway to Your Modbus Network
Let's integrate the Gateway into your existing Modbus network. This involves configuring your Modbus TCP client to connect to the Gateway.