SmartLogger1000
User Manual
4 Electrical Connections
Issue 12 (2019-01-15)
Copyright © Huawei Technologies Co., Ltd.
31
Figure 4-8
COM ports on the SmartLogger
Table 4-2
COM port description
Port
Identifier
Function
COM1 port
NC
Reserved
NC
Reserved
-
RS485B, for RS485 negative
differential signaling
+
RS485A, for RS485 positive
differential signaling
COM2 port
-
RS485B, for RS485 negative
differential signaling
+
RS485A, for RS485 positive
differential signaling
COM3 port
-
RS485B, for RS485 negative
differential signaling
+
RS485A, for RS485 positive
differential signaling
The RS485 terminal block or RJ45 port on the SUN2000 is used for RS485 communication.
There are two types of RS485 terminal blocks (1 and 2) located in different models of
SUN2000s. All the SUN2000s have RJ45 ports. You are advised to use terminal blocks for
connection.
Terminal block connection
−
Terminal block 1
shows the position of the terminal block in the
SUN2000-50KTL/50KTL-C1.
describes the functions of the terminal
block.