X4 rear panel connector – Rockwell Automation 865 Differential Protection Relay User Manual
Page 167
Connections
9-7
865-UM001A-EN-P – July 2009
X4 Rear Panel Connector (Local RS232 and Extension RS485 ports)
Table 9.3 – Rear Panel Connector Signals
Rear panel port (LOCAL)
Pin
Signal
X4 1
No
connection
X4
2
Rx in, RS232 local
X4
3
Tx out, RS232 local
X4
4
DTR out (+8 V)
X4 5
GND
X4 6
No
connection
X4
7
B RS485 extension port
X4
8
A+ RS485 extension port
X4 9
No
connection
NOTE: In the Allen-Bradley relays, a positive RS485 voltage from
A+ to B corresponds to bit value “1”. In the X4 connector
the RS485 extension port is not galvanically isolated.
1 2
3
4
Figure 9.7 – Dip Switches in RS-485 and Optic Fiber Options
Table 9.4 – DIP Switch Functions
Dip switch
number
Switch Position
Function
RS-485
Function
Fibre optics
1
Left
2-wire connection
Echo off
1
Right
4-wire connection
Echo on
2
Left
2-wire connection
Light on in idle state
2
Right
4-wire connection
Light off in idle state
3
Left
Termination On
Not applicable
3
Right
Termination Off
Not applicable
4
Left
Termination On
Not applicable
4
Right
Termination Off
Not applicable
NOTE: The internal 2-wire RS485 port in X4 connector is not
galvanically isolated.