D20/D200
Installation and Operations Guide
GE Energy
994-0078-2.00-7 General
86
Full
Connections and Configuration
, continued
Procedure:
Installing an
HDLC Cable
To connect the two CCUs using a D.20 HDLC connection:
•
Connect one end of the HDLC Cable to the D.20 port you have selected for
redundancy communications on CCU A (see “Selecting an HDLC Port” below),
and the other end to the D.20 port on CCU B. See Assembly Drawing
977-
0089-AD
for further details.
Selecting an
HDLC Port
If you use a D.20 HDLC connection for inter-CCU communications, configure both
CCUs, using Config Pro, to select either HDL0 or HDL1, as appropriate.
Procedure:
Connecting
Serial
Communi-
cation Cables
To connect CCU serial communication ports to the serial ports on the RS-232 Switch
Panel, use standard RS-232 cables, with DB9 female connectors at both ends. See
“Redundant Multi-Node Systems” on page 86 for instructions on how to cable serial
communications in multi-node redundant systems.
Serial Port Pin-
Outs
Depending on the type of D20/D200 main processor board (D20ME or D20ME II),
CCU serial ports can be configured as RS-232, RS-485 2-wire, or RS-485 4-wire.
The pin-outs for each of these options is as follows:
DB9 Connector
RS-232
RS-485 2-wire
RS-485 4-wire
(RS-422)
1 DCD NC NC
2
RXD
RX- (see note)
RX-
3
TXD
TX- (see note)
TX-
4 +V +V +V
5
Common Ground
Common Ground
Common Ground
6 -12V
-12V
-12V
7
RTS
TX+ (see note)
TX+
8
CTS
RX+ (see note)
RX+
9 Chassis
Ground
Chassis Ground
Chassis Ground
Note:
For RS-485 2-wire operation, RX- must be connected to TX-, and RX+ must be connected
to TX+.
Redundant
Multi-Node
Systems
If you have a multi-node system, you may require multiple RS-232 Switch Panels,
depending on the number of serial connections your configuration supports.
In multi-node systems, one D20ME/ME II board is designated as the Master and
other D20ME/ME II boards are designated as Slaves. Normally, serial
communications are connected to one or more of the slave processor boards, in
which case, all seven of the slave’s serial ports can be connected to the RS-232
Switch Panel and used for serial communications.
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