4. Comm. & Monitoring
4. Comm. & Monitoring
.27.
.26.
Monitoring system for multiple inverters
Multiple inverters can be monitored through RS-485 and Ethernet daisy chain configuration.
Internet
Datalogger
PC monitoring
PV Strings
PV Strings
PV Strings
Inverter
Inverter
Inverter
Figure . Multiple inverter monitoring system
4 1
DC
RS485/Ethernet
RS-485 communication supports two connections methods: RJ45 connectors/ Terminal board
1. RS-485 communication through RJ45 connector
RJ45 port connection (See figure 4.2).
CAT 5E outdoor rated (cable outer diameter<9mm, internal resistance
≤
1.5
Ω/
10m) and
shielded RJ45 connectors are recommended.
4.1 RS485 communication
485
-
IN
485
-
O
UT
Figure 4.2 RJ45 port
Ethernet
IN
Ethernet
OUT
Figure 4.3 Strip the insulation layer and connect to RJ45 plug
Correspondence between the
cables and the stitches of plug
Pin 1: white and orange
;
Pin 2: orange
Pin
3: white and green；
Pin 4: blue
Pin 5: white and blue
；
Pin 6: green
Pin 7: white and brown
；
Pin 8: brown
Pin 1 with 4 and 2 with 5 are
used for communication connection
Pin 1 and 4 are connected with RS485+A
Pin 2 and 5 are connected with RS485 - B
1--8
RJ45
plug
RJ45
terminal
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
R S 4 8 5 + A
R S 4 8 5 - B
Use the network wire stripper to strip the insulation layer off the communication cable.
Using the standard wire sequence referenced in TIA/EIA 568B, separate the wires in the cable.
Use a network cable tool to trim the wire. Flatten the wire in the order shown in figure 4.3.
2. RS-485 communication through terminal board.
Figure 4.4
The cross sectional area of the conductor wire for terminal board connection should be
0.2-1.5mm.
The outer diameter of the cable may be 5mm-10mm.
NO
.
Port definition
Description
1
2
3
4
RS485A1,RS485 differential
RS485B1,RS485 differential signal-
RS485A2,RS485 differential
RS485B2,RS485 differential signal-
RS485A1 IN
RS485B1 IN
RS485A2 OUT
RS485B2 OUT
Connection
of
Terminal
board.
a. Strip the insulation and shield to a suitable length. Use diagram below as a guide.
(in Figure 4.5).
b.
Remove the cap nut from the waterproof cable glands labeled at the bottom of the inverter.
Remove the plug from the fitting. (in Figure 4.6).
1
2
4
3
There are 5 communication terminals on Canadian Solar inverter. COM1 is a 4-pin connector
reserved for Canadian Solar WiFi/Cellular datalogger. COM2 and COM3 are RS485 connection
between inverters and both RJ45 and Terminal block are provided for use .
COM4 and COM5 are the Ethernet connection via RJ45.
