7-6 Communications Date Code 20080110
SEL-387E Instruction Manual
Port Identification
If there is ever uncertainty about the number of the port to which you are connected (1–4), use
the command SHO P <Enter>. The relay will respond with a message identifying the port
number and will list the settings for that port. The SHO P command is discussed later in more
detail.
Cables
The following EIA-232 cables are compatible with the SEL-387E. The cable diagrams show
several types of EIA-232 serial communications cables that connect the SEL-387E to other
devices. SEL provides fiber-optic transceivers and distance as compared to copper links. The
equivalent fiber cables are listed following each copper cable description. These and other
cables are available from SEL. Contact the factory for more information.
SEL-387E Relay to Computer
Cable C234A
SEL-387E Relay
9-Pin Male
“D” Subconnector
*DTE Device
9-Pin Female
“D” Subconnector
Cable C227A
SEL-387E Relay
9-Pin Male
“D” Subconnector
*DTE Device
25-Pin Female
“D” Subconnector
RXD 2
TXD 3
GND 5
CTS 8
GND 5
TXD 3
RXD 2
GND 9
CTS 8
3 TXD
2 RXD
5 GND
8 CTS
7 RTS
1 DCD
4 DTR
6 DSR
7 GND
3 RXD
2 TXD
1 GND
4 RTS
5 CTS
6 DSR
8 DCD
20 DTR
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