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10-2
Serial Port Communications and Commands
Date Code 20011205
SEL-311B Instruction Manual
Table 10.1: 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
EIA-232 Serial Port Jumpers
in
Section 2: Installation
.
Table 10.2: 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-311B Relay to other devices. SEL provides fiber-optic transceivers and cable
for communications links with improved safety, noise immunity, 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.
Summary of Contents for SEL-311B
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