7.8
SEL-700G Relay
Instruction Manual
Date Code 20170814
Communications
Communications Interfaces
Port Connector and
Communications
Cables
Figure 7.9 shows the EIA-232 serial port DB-9 connector pinout for the
SEL-700G.
Figure 7.9
EIA-232 DB-9 Connector Pin Numbers
Table 7.2 shows the pin functions for the EIA-232 and EIA-485 serial ports.
The following cable diagrams show several types of EIA-232 serial
communications cables that connect the SEL-700G to other devices. These
and other cables are available from SEL. Contact the factory for more
information.
Figure 7.10
SEL Cable C234A— SEL-700G to DTE Device
Table 7.2
EIA-232/EIA-485 Serial Port Pin Functions
Pin
a
a
For EIA-485, the pin numbers represent relay terminals _O1 through _05.
PORT 3
EIA-232
PORT 3
EIA-485
PORT 4C
EIA-232
PORT 4A
EIA-485
PORT F
EIA-232
1
+5 Vdc
+TX
+5 Vdc
+TX
N/C
2
RXD
–TX
RXD
–TX
RXD
3
TXD
+RX
TXD
+RX
TXD
4
IRIG+
–RX
N/C
–RX
N/C
5
GND
Shield
GND
Shield
GND
6
IRIG –
N/C
N/C
7
RTS
RTS
RTS
8
CTS
CTS
CTS
9
GND
GND
GND
5 4 3 2 1
9 8 7 6
NOTE:
Serial communications
cables that are used in the SEL-700G
relays for the M
IRRORED
B
ITS
protocol
should have the
R
designation at the
end of the SEL cable number instead
of an
A
. For example, use C234
R
instead of C234
A
.
SEL-700G Relay
9-Pin Male
D Subconnector
9-Pin Female
D Subconnector
2
3
5
8
3
2
5
8
7
1
4
6
RXD
TXD
GND
CTS
TXD
RXD
GND
CTS
RTS
DCD
DTR
DSR
Pin
Func.
Pin
Func.
Pin #
Pin #
*DTE Device
*DTE = Data Terminal Equipment (Computer, Terminal, etc.)
Summary of Contents for SEL-700G Series
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