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5. Modbus Network Installation
5.1 Overview
PV Powered commercial inverters are supplied with an integrated RS-485 modbus
slave connection on the Data Monitoring Module. This chapter explains how to connect
a PV Powered commercial inverter to a modbus network using the modbus serial
communication protocol. This chapter is written for PV installers and modbus network
programmers.
5.2 Modbus Communication Protocol
Modbus is a serial communications protocol for use with Programmable Logic
Controllers (PLCs). Modbus has become a standard communications protocol and is now
the most commonly available means of communicating with industrial electronic devices
such as PV Powered inverters. Modbus also allows for communication between a modbus
master and multiple slave devices connected to the same network. RS-485 is the protocol
standard used by PV Powered as the hardware’s serial interface while modbus is the
communication protocol that runs on the PV Powered inverters.
5.3 Networking Using the Modbus Option
The following steps can be performed by a qualified installer to set up a modbus network.
These steps are:
A. Field installation process (to be performed on-site)
The first three steps can be completed by a PV installer that does not have working
knowledge of a modbus network:
1.. Installing.the.modbus.cable.
2.. Using.jumpers.to.set.the.pins.
3.. Setting.the.modbus.address.for.each.slave.inverter.
B. Modbus network configuration process (can be completed on-site
or remotely)
The last two steps should be completed by the modbus network programmer:
1.. Setting.the.communication.parameters.
2.. Using.modbus.commands.
MODBUS
INST
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