Rockwell Automation 865 Differential Protection Relay - Manual (Page 128)

7-2 Communications
865-UM001A-EN-P – July 2009
Local Port X4
The local port has two connectors:
On the front panel
X4 the rear panel (D9S pins 2, 3 and 5)
Only one can be used at a time.
NOTE: The extension port is locating in the same X4 connector.
NOTE: When the 857-VX003-3 cable is inserted to the front panel
connector it activates the front panel port and disables the rear panel
local port by connecting the DTR pin 6 and DSR pin 4 together. See
Figure 7.1.
Protocol for the Local Port
The front panel port is always using the command line protocol for
SetPointPS regardless of the selected protocol for the rear panel local
port.
If other than "None" protocol is selected for the rear panel local port,
the front panel connector, when activated, is still using the plain
command line interface with the original speed, parity etc. For
example if the rear panel local port is used for remote SetPointPS
communication using SPA-bus default 9600/7E1, it is possible to
temporarily connect a PC with SetPointPS to the front panel
connector with the default 38400/8N1.
While the front panel connector is in use, the rear panel local port is
disabled. The communication parameter display on the local display
will show the active parameter values for the local port.
Physical Interface
The physical interface of this port is RS-232.