Sel SEL-787 - Figure 7.10 SEL Cable C234 A-SEL-787 to DTE Device; Figure 7.11 SEL Cable C227 A-SEL-787 to DTE Device; Figure 7.12 SEL Cable C222-SEL-787 to Modem

7.8
SEL-787 Relay Instruction Manual Date Code 20150130
Communications
Communications Interfaces
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 7.10 SEL Cable C234A—SEL-787 to DTE Device
Figure 7.11 SEL Cable C227A—SEL-787 to DTE Device
Figure 7.12 SEL Cable C222—SEL-787 to Modem
8CTS CTS CTS
9 GND GND GND
a
For EIA-485, the pin numbers represent relay terminals _O1 through _05.
Table 7.2 EIA-232/EIA-485 Serial Port Pin Functions (Sheet 2 of 2)
Pin
a
PORT 3
EIA-232
PORT 3
EIA-485
a
PORT 4C
EIA-232
PORT 4A
EIA-485
a
PORT F
EIA-232
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.)
SEL-787 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 #
**DCE Device
**DCE = Data Communications Equipment (Modem, etc.)