6 Electrical Connection
User Manual
34
RS485 cable’s requirements to ensure quality of communication:
RS485 shielded twisted pair cables
Shielded network cable
The diameter of the cable outside diameter should be in the range of
5.1~ 6.5mm.
A converter such as RS485-232 converter or SolarInfo Logger,
which converts 485 to 232 signal, is needed between inverter and
PC.
6.5.2 Communication System
For Single Inverter
Where there is only one inverter, a RS485 cable enables connection between
inverter and data logging device.
Inverter
Communication Connection
(RS 485 A/B bus or RJ 45)
Terminating
Resistor
RS 485 A/B bus
RJ 45
Single one
Only out.
Only out.
No
For Multiple Inverters
Where there is more than one inverter, all inverters can be connected to data
logging device in daisy chain. The first and last inverters in the chain must be
terminated with a resistor of 120Ω. The shielding layer of RS485 cable should
be single-point grounded.
The maximum number that inverters are connected in the daisy chain depends
on converter, data logging device and other factors. Please refer to converter’s
or data logging device’s manual to obtain the limit no..
Inverter
Communication Connection
(RS 485 A/B bus or RJ 45)
Terminatin
g Resistor
RS 485 A/B bus
RJ 45
