
5 Hardware
PCS-9785 Satellite-Synchronized Clock
5-8
Date: 2014-10-15
01
02
03
SYN+
SYN-
SGND
FGND
04
Twisted
pair wire
To the screen of other cable with
single point earthing
IR
IG
-B
S
ign
al
09
10
11
RxD
TxD
SGND
RS
-232
FGND 12
Twisted-pair wire
To the foiled layer of other
cable with single point earthing
Figure 5.5-4 Wiring of synchronization port (CLK module NR1141)
5.6 COM Module
The COM module provides extension output interfaces for clock synchronization..
5.6.1 RS-485 (NR1205A)
The COM module NR1205A provides 7 RS-485 serial ports. The No.1~4 ports form the group 1
and the No.5~7 form the group 2.
NR1205A
Figure 5.6-1 COM Module (NR1205A)
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 transmission and reception terminals. The other pair of twisted pairs is used to
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