Comtrol Modbus TCP Quick Start - Manual (Page 71)

DeviceMaster UP Modbus/TCP Quick Start: 2000477 Rev. G Alias Device ID Functionality - 71
Alias Device ID Functionality
Use the Alias Modbus Device ID Configuration page to set up Alias device IDs. Alias Device IDs convert
received message device IDs to alias device IDs and then route the modified Modbus message.
Note the following:
• The Alias Modbus Device ID functionality allows modification of device IDs only when messages are
received from Modbus masters.
• Alias device ID configurations can convert a Modbus message to address a Modbus device (device ID 1-
247), a serial raw/ASCII device (device ID = 255), or a Ethernet TCP/IP raw/ASCII device (device ID =
255).
• The Alias Device ID functionality is intended to help solve problems that occur when:
- A serial Modbus device ID cannot be changed to match a Modbus master program, such as for a PLC.
- A Modbus master program, such as for a PLC or SCADA system, cannot be modified.
- A Modbus master with one connection, such as serial PLC, requires connectivity to multiple Modbus
slave devices with the same device ID and one or more of the slave devices are connected remotely to
different gateways.
Note: The Modbus Router firmware has been designed to provide network-wide Modbus connectivity for serial
Modbus masters.