Taking into consideration electromagnetic interference it is recommended to use
shielded conductors for the connection of input and output signals.
The power supply must be connected by means of a two-wire conductor with
a suitable cross-section ensuring its protection by means of an installation fusible
cut-out, in case of a short-circuit. Requirements concerning the supply cable are
regulate by EN 61010-1 p.6.10 standard.
Fig.3 External connections of the NA5 meter
8 outputs of OC type
4 relay outputs
c/ Connection way of digital and analogue output signals depending on the
execution code
27
23
26
24
25
30 29 28
32 31
A1 A2 A3 A4 A5 A6 A7 A8
GND
27 26 25
30 29 28
32 31
A1
A 3
A 5
A 7
...
A
GND
B
B
A
GND
GND
A
B
RTS
RxD
TxD
DB9
6
1
9
5
DB9
6
1
9
5
19
17
18
NA5 Meter
19
17
18
NA5 Meter
IBM PC computer
IBM PC computer
with an RS-485 card
10
11
12
13
8
9
PD5
d/ Connection way of the RS-485 interface
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