Schweitzer Engineering Laboratories SEL-251 - IRIG-B Input Description

Date Code 20000421 Installation 6-5
SEL-251, -2, -3 Instruction Manual
3 TXD
2 RXD
5 GND
8 CTS
7 RTS
2 +IRIG
3 -IRIG
Cable 239
Data and IRIG-B
SEL-2020 SEL-251
Cable 272A
Data Only
SEL-2020 SEL-251
* DTE = Data Terminal Equipment (Computer, Terminal, Printer, etc.)
** DCE = Data Communications Equipment (Modem, etc.)
IRIG-B Input Description
The port labeled J201/AUX INPUT receives demodulated IRIG-B input. Pin definitions appear
in Table 6.1.
Table 6.1: IRIG-B Pin Definitions
Pin Name Description
1 +5 *
2 IRIGIN HI Positive IRIG-B input
3 IRIGIN LOW Negative IRIG-B input
4 +12 *
6 -12 *
5, 9 GND Ground for ground wires and shields
* Consult the factory before using these power supply outputs
RXD 2
TXD 3
GND 5
RTS 7
CTS 8
+IRIG 4
-IRIG 6
RXD 2
TXD 3
GND 5
RTS 7
CTS 8
3 TXD
2 RXD
5 GND
8 CTS
7 RTS
Port 2R / J203
AUX Input / J201