7.5
Date Code 20081022
Instruction Manual
SEL-787 Relay
Communications
Communications Interfaces
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-787 to other devices. These and
other cables are available from SEL. Contact the factory for more information.
Figure 7.2
SEL Cable C234A— SEL-787 to DTE Device
Figure 7.3
SEL Cable C227A— SEL-787 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+
b
b
Models, Options, and Accessories on page 1.2
for availability of IRIG-B.
–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
SEL-787 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.)
SEL-787 Relay
9-Pin Male
D Subconnector
25-Pin Female
D Subconnector
5
3
2
9
8
7
3
2
1
4
5
6
8
20
GND
TXD
RXD
GND
CTS
GND
RXD
TXD
GND
RTS
CTS
DSR
DCD
DTR
Pin
Func.
Pin
Func.
Pin #
Pin #
*DTE Device
*DTE = Data Terminal Equipment (Computer, Terminal, etc.)
Summary of Contents for SEL-787
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