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84 Product manual - PVS-175-TL;A.1 Version

5.9.4 Serial communication connection (RS485 - Slave mode)

NOTE – D Please note that automatic settings of network parameters at turning on, embedded

logging capability, automatic logger-free transferring of data to Aurora Vision Cloud and

remote firmware update are provided over TCP/IP (Ethernet and/or Wi-fi) bus only.

NOTE – D The use of the inverters over the RS485 line is recommended in case of monitoring and

controlling by using third party RS485 control systems.

NOTE – D By default the RS485 port (43) is set as Slave mode. In case the port was set as “Master

mode” it must configured through the Web User Interface (refer to “CONNECTIVITY menu”

section) to use the RS485 as a serial communication line.

NOTE – D RS485 line supports Modbus/RTU SUNSPEC compliant Modbus protocol.

The RS-485 port can be used to set up a line of communication which, when connected to a monitoring

device, enables the operation of the photovoltaic system to be kept under control. Depending on the

device used, monitoring can be local or remote.

The RS-485 serial communication line is available on the communication and control board (26) with two

terminal blocks (43) for each serial line signal (+T/R, -T/R and RTN) so as to be able to make a daisy-chain

connection (“in-out”) of multiple inverters.

J10J9

S2 S1 S3

J7 J8

J20

2 3 4

1 4

485+ RTN485-

485+ RTN

SHIELD

SHIELD485-

For long distance connections is necessary to use a shielded twisted pair cable with characteristic

impedance of Z0=120 Ohm as shown on the following table:

Signal Symbol

SHIELD

+ 485

- 485

RTN

SHIELD

Positive data + 485

Negative data - 485

Reference RTN

Shield SHIELD

ABB PVS-175-TL User Manual

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