Huawei SmartLogger2000 User Manual page 47

SmartLogger2000
User Manual
Figure 4-6 Ports on an RS485 signal SPD
Table 4-1 describes the surge protection ports.
Table 4-1 Port description
RS485
Surge
Protec
tion
Port
RS485
surge
protect
ion
port 1
RS485
surge
protect
ion
port 2




(2016-06-20)
Pro Port Function
tect Definiti
ion on
Por
t
2 RS485A RS485A, for
IN RS485 positive
differential
signaling
6 RS485B RS485B, for
IN RS485 negative
differential
signaling
8 RS485A RS485A, for
IN RS485 positive
differential
signaling
12 RS485B RS485B, for
IN RS485 negative
differential
signaling
Protection ports are connected to COM ports on the SmartLogger. Port 4 is not connected.
Surge ports are connected to RS485 ports of other devices. Port 3 is the ground port.
Protection ports and Surge ports must not be reversely connected.
One RS485 signal SPD can protect two COM ports.
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4 Connecting Cables
Su Port Function
rg Definitio
e n
Po
rt
1 RS485A RS485A, for RS485
OUT positive differential
signaling
5 RS485B RS485B, for RS485
OUT negative differential
signaling
7 RS485A RS485A, for RS485
OUT positive differential
signaling
11 RS485B RS485B, for RS485
OUT negative differential
signaling
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