Sel 551 - Page 121

5.3
Date Code 20110408 Instruction Manual SEL-551 Relay
Serial Port Communications and Commands
Port Connector and Communications Cables
SEL-551 to Modem
SEL-551 to SEL PRTU
SEL-551 to SEL-2032/
SEL-2030/SEL-2020
SEL-551 Relay
9-Pin Male
"D" Subconnector
25-Pin Female
"D" Subconnector
5
3
7
2
8
9
7
2
20
3
8
1
GND
TXD
RTS
RXD
CTS
GND
GND
TXD (IN)
DTR (IN)
RXD (OUT)
CD (OUT)
GND
Pin
Func.
Pin
Func.
Pin # Pin #
Cable SEL-C222
**DCE Device
**DCE = Data Communications Equipment (Modem, etc.)
SEL-PRTU
9-Pin Male
Round Conxall
9-Pin Male
"D" Subconnector
1
2
4
5
7
9
5
2
3
7
8
9
GND
TXD
RXD
CTS
+12
GND
GND
RXD
TXD
RTS
CTS
GND
Pin
Func.
Pin
Func.
Pin # Pin #
Cable SEL-C231
SEL-551 Relay
9-Pin Male
"D" Subconnector
9-Pin Male
"D" Subconnector
2
3
4
5
6
7
8
3
2
4
5
6
8
7
RXD
TXD
IRIG+
GND
IRIG–
RTS
CTS
TXD
RXD
IRIG+
GND
IRIG–
CTS
RTS
Pin
Func.
Pin
Func.
Pin # Pin #
SEL Communications
Processors
Cable SEL-C273A
SEL-551 Relay