SmartLogger1000
User Manual
4 Electrical Connections
Issue 12 (2019-01-15)
Copyright © Huawei Technologies Co., Ltd.
28
Table 4-1
Port description
RS485
Surge
Protection
Port
Prote
ction
Port
Function
Surg
e
Port
Function
RS485
surge
protection
port 1
2
RS485A, for RS485
positive differential
signaling
1
RS485A, for RS485 positive
differential signaling
6
RS485B, for RS485
negative differential
signaling
5
RS485B, for RS485 negative
differential signaling
RS485
surge
protection
port 2
8
RS485A, for RS485
positive differential
signaling
7
RS485A, for RS485 positive
differential signaling
12
RS485B, for RS485
negative differential
signaling
11
RS485B, for 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.
Protection ports 2 and 6 and surge ports 1 and 5 form an RS485 signal SPD port for protecting one
COM port. Protection ports 8 and 12 and surge ports 7 and 11 form another RS485 signal SPD port
for protecting one more COM port.
Procedure
Step 1
Remove an appropriate length of steel armor and insulation layer from the cable using a wire
stripper, as shown in
Figure 4-4
Stripping an RS485 communications cable (unit: mm)
Step 2
Remove the terminal block from the SmartLogger COM port, as shown in