Table of Contents

RS485-Ethernet TCP/IP Converters

ModbusTCP

When Modbus electricity meters are read directly from the Teltonika manufacturer's LAN or 4G router, a Protoss-PE11 type RS485-Ethernet converter is used.

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As Modbus communication primarily uses an IP/TCP network, it is referred to as ModbusTCP, as opposed to Modbus RTU which passes solely through an RS485 bus.

The RS485-Ethernet converter can also be connected to the Climkit gateway. Several converters can be used simultaneously depending on the project configuration.

By default, the device is delivered configured and ready to use with the Climkit router.

Default settings:

Static IP address: 192.168.2.10

RS485 bus settings:

  • Baudrate: 9600
  • Parity: None
  • Data Size: 8
  • Stop Bits: 1

If the device has been reset, it reverts to DHCP mode, meaning the router will randomly assign it a new IP address. Refer to the router configuration to find this address.

The converter is configurable via its internal web portal, accessible directly through a browser using its IP address. Login admin/admin.

Here is the default configuration used by Climkit:

Configuration with USR-DR302 converter

The USR-DR302 model is an alternative to the Protoss-PE11 and was used by Climkit until 2024.

Default settings. Connect to IP address 192.168.0.7:

Under IP Type, select DHCP or Static IP:

RS485 bus settings:

  • Baudrate: 9600
  • Parity: None
  • Data Size: 8
  • Stop Bits: 1
  • Local port: 502
  • Work mode: TCP Server

Check Modbus TCP:

To change the username and password required to connect to the web interface:

Mbus via TCP

The converter can also be used to read MBus devices via an RS485-MBus converter.

The settings are the same as above with the exception of:

  • Baudrate: 2400
  • Parity: EVEN
  • Protocol: None
Warning: If Modbus and MBus devices need to be read via TCP, two RS485-Ethernet converters must be used, one for Modbus and the other for MBus. See principle diagram.

Configuration with USR-DR302 converter

The settings are the same as above with the exception of:

  • Baudrate: 2400
  • Data Size: 8
  • Parity: EVEN
  • Stop Bits: 1
  • Port: 502
  • Work Mode: TCP Server

Uncheck Modbus TCP:

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