10-2 Serial Port Communications and Commands
Date Code 20000616 SEL-300G Instruction Manual
IRIG-B
You can input the demodulated IRIG-B time code into Serial Port 2 on any of the SEL-300G
Relay models This is handled adeptly by connecting Serial Port 2 of the SEL-300G Relay to an
SEL-2020 or an SEL-2030 with Cable C273A (see cable diagrams that follow in this section).
The demodulated IRIG-B time code can be input into the connector for Serial Port 1 on these two
models. If demodulated IRIG-B time code is input into this connector, it should not be input into
Serial Port 2 and vice versa.
Table 10.2: Pinout Functions for EIA-232 Serial Ports 2, 3, and F
Pin Port 2 Port 3 Port F
1 N/C or +5 Vdc
1
N/C or +5 Vdc
1
N/C
2 RXD RXD RXD
3 TXD TXD TXD
4 +IRIG-B N/C N/C
5, 9 GND GND GND
6 -IRIG-B N/C N/C
7 RTS RTS RTS
8 CTS CTS CTS
1
See Figure 5.25 in Section 5: Installation
Table 10.3: Terminal Functions for EIA-485 Serial Port 1
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
connect the SEL-300G Relay to other devices. These and other cables are available from SEL.
Contact the factory for more information.
SEL-300G to Computer
Cable C234A
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