8–2
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
DGA MONITORING
CHAPTER 8: TRANSFORMER M&D
DGA Monitoring
The 845 relay provides configuration parameters to establish communication with DGA
devices on Modbus TCP/IP protocol. Four DGA devices are supported – Transfix, DGA 500,
Minitrans, and HM2. The 845 relay supports MODBUS TCP client protocol which acts as the
master or client to M&D devices.
The following configuration parameters are used for establishing the communication
between the 845 relay and DGA device.
IP ADDRESS
Range: standard IPv4 address
Default: 0.0.0.0
This setting specifies the IP address of the M&D DGA device that communicates with the
845 relay.
SLAVE ADDRESS
Range: 0 to 254
Default: 0
This setting is the slave ID field (unit ID) within the Modbus protocol. It is the ID of the
M&D device, and each M&D device in general has a unique ID.
PORT
Range: 0 to 10000
Default: 502
This setting is the standard port setting of the Modbus protocol. Port setting 502 is the
setting most often used for all Modbus based communications.
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