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5 Hardware
PCS-9785 Satellite-Synchronized Clock
5-9
Date: 2014-10-15
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.
01
02
03
A
B
SGND
RS
-485
FGND 04
Twisted-pair wire
To the foiled layer of other
cable with single point earthing
Figure 5.6-2 Serial port wiring of NR1205A
Table 5.6-1 Pin definition of NR1205A
Pin No.
Symbol
Description
Port No.
01
1A
RS-485: A
Serial port 1
02
1B
RS-485: B
03
1/2 SGND
Signal reference
04
1/2 FGND
Foiled layer
05
2A
RS-485: A
Serial port 2
06
2B
RS-485: B
07
3A
RS-485: A
Serial port 3
08
3B
RS-485: B
09
3/4 SGND
Signal reference
10
3/4 FGND
Foiled layer
11
4A
RS-485: A
Serial port 4
12
4B
RS-485: B
13
5A
RS-485: A
Serial port 5
14
5B
RS-485: B
15
5/6 SGND
Signal reference
16
5/6 FGND
Foiled layer
17
6A
RS-485: A
Serial port 6
18
6B
RS-485: B
19
7A
RS-485: A
Serial port 7
20
7B
RS-485: B
21
7 SGND
Signal reference
22
7 FGND
Foiled layer
The output polarity mode and the output signal mode can be selected by setting the corresponding
jumpers on the module.
08020
08020
08020
08020
08020
08020
08020
08020
08020