Huawei SmartLogger2000 series Quick Manual page 34

Connecting the Communications Cable
RS485 Surge
Protection Port
RS485 surge
protection port 1
RS485 surge
protection port 2
1. Protection ports connect to the COM ports on the SmartLogger. Port 4 is not connected.
2. Surge ports connect to RS485 ports on other devices. Port 3 is the ground port.
3. Protection ports and surge ports must not be confused.
4. One RS485 signal SPD can protect two COM ports.
5. 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.
Recommended: two-core or multiple-core cable with a cross-sectional area of 0.5–2.5 mm
1. Strip armor from the cable and insulation
layer from the core wires from both ends.
Unit: mm
2. Connect one end of one cable to the
terminal block on the COM port of the
SmartLogger.
Protection
Function
Port
RS485A, RS485
2
differential signal+
RS485B, RS485
6
differential signal–
RS485A, RS485
8
differential signal+
RS485B, RS485
12
differential signal–
NOTICE
Verify that the COM+ port on the SmartLogger connects to
protection port 2 or 8 on the RS485 signal SPD, and that the
COM– port on the SmartLogger connects to protection port 6 or
12 on the RS485 signal SPD.
33
Surge Port
1
5
7
11
3. Connect the other end of the cable
to the protection port of the RS485
signal SPD.
Function
RS485A, RS485
differential signal+
RS485B, RS485
differential signal –
RS485A, RS485
differential signal+
RS485B, RS485
differential signal–
2