
5 Hardware
PCS-9785 Satellite-Synchronized Clock
5-7
Date: 2014-10-15
IRIG-B
IRIG-B
NR1141A
1 SYN1+
2 SYN1-
3 SGND1
4 FGND1
5
6 SYN2-
7 SGND2
SYN2+
8 FGND2
9 RXD
10 TXD
11 SGND
12 FGND
1
IRIG-B 1
2
IRIG-B 2
Figure 5.5-3 CLK module
CAUTION!
Do
NOT
look into the end of an optical fiber connected to an optical port.
Do
NOT
look into an optical port/connector.
A direct sight to laser light may cause temporary or permanent blindness.
NOTICE!
Each IRIG-B input channel supports optic ST connector and RS-485 serial port.
However, these two modes should be used exclusively.
The correct serial port wiring is shown in the following figure. Generally, a foiled cable with at least
two pairs of twisted pairs shall be applied. One pair of the twisted pairs are respectively used to
connect the "+" and "-" terminals. The other pair of twisted pairs is used to connect the signal
reference "SGND" of the communication interface. If there is a free terminal or a grounding
terminal "FGND" for all the communication ports, it is suggested to connect the foiled layer of the
cable when connecting multiple devices in series. The foiled layer connection of the cable shall be
grounded at only one end.
08020
08020
08020
08020
08020
08020
08020
08020
08020