7.3
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Serial Port Communications and Commands
Establish Communication
For example, to connect the SEL-387 Ports 2, 3, or 4 to the 9-pin male
connector on a laptop, order cable number C234A and specify the length
needed. To connect the SEL-387 Port 2 to the SEL-2032, SEL-2030 or
SEL-2020 Communications Processor that supplies the communication link
and the time synchronization signal, order cable number C273A, and specify
the length needed. For connecting devices at over 100 feet, fiber-optic
transceivers are available. The SEL-2800 and SEL-2810 provide fiber-optic
links between devices for electrical isolation and long-distance signal
transmission. Call the factory for further information on these products.
The following cable diagrams show several types of EIA-232 serial
communications cables. These and other cables are available from SEL.
Contact the factory for more information.
Table 7.2 SEL-387 Communication Cable Numbers
SEL-387
Port #
Connect to Device
(gender refers to device)
SEL Cable #
2, 3, 4 PC, 25-Pin Male (DTE) C227A
2, 3, 4 PC, 9-Pin Male (DTE) C234A
2, 3 SEL-2032, SEL-2030,
or SEL-2020 without IRIG-B
C272A
2 SEL-2032, SEL-2030,
or SEL-2020 with IRIG-B
C273A
2 SEL IDM, Ports 2 through 11 Requires a C254 and C257 cable
2, 3 Modem,
5 Vdc Powered (pin 10)
C220
a
a
The 5 Vdc serial port jumper must be installed to power the Modem using C220. See
Section 2: Installation.
2, 3 Standard Modem,
25-Pin Female (DCE)
C222
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