869 MOTOR PROTECTION SYSTEM – COMMUNICATIONS GUIDE 2-1
869 Motor Protection System
Chapter 2: Communication Ports
GE
Digital Energy
Communicatio n Ports
The 869 has four communications ports: RS485, WiFi, USB, and Ethernet.
RS485 Port
SERIAL
RS485 port: ............................................................Isolated
Baud rates:.............................................................Supports 9600, 19200, 38400, 57600, and 115200 kbps
Response time:.....................................................10 ms typical
Parity:........................................................................None, Odd, Even
Protocol: ..................................................................Modbus RTU, DNP 3.0, IEC 60870-5-103
Maximum distance: ...........................................1200 m (4000 feet)
Isolation:..................................................................2 kV
RS485
On the rear card the 869 is equipped with one RS485 serial communication port and one
10/100
Mbps Ethernet port. The RS485 port has settings for baud rate and parity. It is
important that these parameters agree with the settings used on the computer or other
equipment connected to this port. A maximum of 32 relays can be daisy-chained and
connected to a DCS, PLC or a PC using the RS485 port.
Path: Setpoints > Device > Communications > RS485
BAUD RATE
Range: 9600, 19200, 38400, 57600, 115200
Default: 115200
PARITY
Range: None, Odd, Even
Default: None
PORT PROTOCOL
Range: Modbus, DNP 3.0, IEC 60870-5-103
Default: Modbus
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