
SmartLogger2000
User Manual
A Installing and Wiring the RS485 Signal SPD
Issue 04 (2018-04-10)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
214
A.2 Connecting the RS485 Signal SPD
When connecting the RS485 signal SPD, you need to connect its PE cable and
communications cable.
Prerequisites
Prepare a ground cable. Recommended: outdoor copper-core cable with a cross-sectional
area of 4 mm
2
or 12 AWG
Prepare a communications cable, for example, a two-core or multi-core cable with a
cross-sectional area of 0.5–2.5 mm
2
.
Context
The way of connecting two to three RS485 signal SPDs is the same as the way of connecting one RS485
signal SPD.
One RS485 signal SPD provides two RS485 surge protection ports.
Figure A-3
Ports on an RS485 signal SPD
Table A-1
Port description
RS485 Surge
Protection Port
Protection
Port
Function
Surge Port
Function
RS485 surge
protection port 1
2
RS485A, RS485
differential
1
RS485A, RS485 differential
6
RS485B, RS485
differential signal–
5
RS485B, RS485 differential
signal–
RS485 surge
protection port 2
8
RS485A, RS485
differential
7
RS485A, RS485 differential
12
RS485B, RS485
differential signal–
11
RS485B, RS485 differential
signal–