Schweitzer Engineering SEL-351P, Quick Start Manual

Page: 487 / 674

Date Code 990215 Serial Port Communications and Commands 10-3
SEL-351P Manual Técnico
Table SECTION 10: .2: Terminal Functions for EIA-485 Serial Port 1 (Optional)
Terminal Function
1 +TX
2 -TX
3 +RX
4 -RX
5 SHIELD
6 N/C
7 +IRIG-B
8 -IRIG-B
The following cable diagrams show several types of EIA-232 serial communications cables that
you can use to connect the SEL-351P to other devices. The male/female references in the cable
diagrams refer to the cable connectors, not the device they are connected to (which would be the
opposite gender). These and other cables are available from SEL. These cables don’t apply to
the wake-up port.
Permanently connected metallic communication cables should be restricted to use inside a
substation control house to reduce the hazards of ground potential rise. SEL recommends that the
metallic cable length be limited to 100 feet or less. If your devices require more than 100 feet of
cable, you should use fiber-optic cable and transceivers to provide complete electrical isolation
and electrical noise immunity. Contact the factory if you need more information, or refer to the
SEL-5801 Cable Selector program.
SEL-351P Recloser Control to Computer
Cable C234A
SEL-351P 9-Pin *DTE Device
9-Pin Male 9-Pin Female
“D” Subconnector “D” Subconnector
RXD 2 3 TXD
TXD 3 2 RXD
GND 5 5 GND
CTS 8 8 CTS
7 RTS
1 DCD
4 DTR
6 DSR