4. Comm. & Monitoring
RS485 communication connection of RJ45 network port
When using terminal 5 (RJ45 connector) to connect, use the following wiring sequence.
Connect the Ethernet cable according to the TIA/EIA 568B standard. Insert the wire into the
RJ45 plug and then use a standard network cable crimping tool to crimp connector to the cable.
4.1 RS485
4.1.1 Wiring a single inverter and daisy chain inverters
Figure 4.2 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
RJ45terminal
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
4.1.2 Maximum allowable inverters using RS485
The maximum allowable inverters per RS 485 daisy chain is 32 pcs. Please contact
monitoring supplier for details.
4.1.3 120-ohm (
Ω
) resistor placement
120Ω resistor placement for end of line communication
Please contact monitor supplier for details.
Overview
There are three (3) sets of terminals used for RS485 communication.
Terminal 4 (Figure 3.8) has screw terminals for a multiple inverter communication
solution using a standard MODBUS cable such as Belden stranded cable.
Terminal 5 is a standard RJ45 terminal and is used for creating a daisy chain connection
between inverters as well as the wired data monitoring.
Terminal 6 is a 4-pin connector which is matched with Canadian Solar communication cables.
Monitoring system for multiple inverters
Multiples of inverters can be monitored in series using RS485 (as shown in Figure 4.1).
All 3 connectors support this type of inverter connection.
Figure 4.1 Multi-inverter monitoring system
≈
Inverter 1
Inverter 2
Inverter n
RS485 IN | OUT
RS485 IN | OUT
RS485 IN | OUT
RS485terminal
RS485
RS232
RS232
Ethernet
Canadian Solar Wi-Fi box
RS485-232converter
PC
Router
RS485terminal
Canadian Solar GPRS box
Internet
Internet
4. Comm. & Monitoring
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