7.7
Date Code 20150130 Instruction Manual SEL-787 Relay
Communications
Communications Interfaces
Cannot use B01–B02 input or Port 3 input if Port 2 is used for IRIG-B input.
Set Global setting IRIG TIME SOURCE to TIME_SRC := IRIG2.
Figure 7.8 IRIG-B Input VIA Fiber-Optic EIA-232 Port 2
(SEL-2401/2404/2407 Time Source)
+5 Vdc Power Supply
Serial port power can provide as much as 0.25 A total from all of the +5 Vdc
pins. Some SEL communications devices require the +5 Vdc power supply.
This +5 Vdc is available on Pin 1 only.
Connect Your
PC to the Relay
The front port of the SEL-787 is a standard female 9-pin connector. You can
connect to a standard 9-pin computer port with SEL cable C234A; wiring for
this cable is shown in Figure 7.10. SEL cable C234A and other cables are
available from SEL. Use the SEL-5801 Cable Selector software to select an
appropriate cable for another application. This software is available for free
download from the SEL website at www.selinc.com.
For best performance, SEL Cable C234A should not be more than 15 meters
(50 feet) long. For long-distance communications and for electrical isolation
of communications ports, use the SEL family of fiber-optic transceivers.
Contact SEL for more details on these devices.
Port Connector and
Communications
Cables
Figure 7.9 shows the front-panel EIA-232 serial port (PORT F) DB-9 connector
pinout for the SEL-787.
Figure 7.9 EIA-232 DB-9 Connector Pin Numbers
Table 7.2 shows the pin functions for the EIA-232 and EIA-485 serial ports.
SEL-2812MT
SEL-2401
or
SEL-2407
SEL-2404
IED
DB9
Mono-Plug
Jack
Use Fiber-Optic Cables
SEL C805 or SEL C807
SEL Cable
C654
Port 2
Set switch to “J1” for IRIG input
from SEL-2401, etc.
ST
ST
BNC
SEL-787
Table 7.2 EIA-232/EIA-485 Serial Port Pin Functions (Sheet 1 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
1 +5 Vdc +TX +5 Vdc +TX N/C
2 RXD –TX RXD –TX RXD
3 TXD +RX TXD +RX TXD
4IRIG+–RXN/C–RXN/C
5 GND Shield GND Shield GND
6IRIG– N/C N/C
7RTS RTS RTS
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