PV Powered PVP260kW Technical Information PDF herunterladen (Seite 70)

The switches are located near the center of the Comm X PCB and are labeled SW1 and

SW2 as they appear in Figure 5-5.

If you need more device addresses than the 100 listed in Table 5-6, refer to a complete

digital to hexadecimal conversion table.

Note: Some Modbus master devices do not allow addresses above the decimal value

of 126. PV Powered recommends keeping the number of slave devices between

2 and 100.

Modbus RS-485 Network Conﬁguration Process

Step 4: Setting the Communication Parameters

This step is part of the network conguration process that should be completed by the

Modbus network programmer. The RS-485 Modbus master communication settings

need to be set to the values in Table 5-7. This allows your Modbus master device to

communicate with the inverter. Follow the instructions in the manual for your master

device to complete these settings.

Parameter Setting

Baud 9600

Parity N

Data bits 8

Stop bit 1

Flow control None

Table 5-7 Communications Settings

Step 5: Using Modbus Commands

PV Powered inverters provide basic Modbus commands. The supported commands are

listed in the following table.

Command Name

Command

Number

Description

Read Holding Register 03

Retrieves the voltage, power and en-

ergy values from the inverter.

Write (Preset) Single Register 06 Enables/disables the inverter.

Return Slave ID 17

Returns a text string containing the ID

number of the inverter.

Table 5-8 Supported Modbus Commands

Format of Modbus commands and responses

Each of the following command sections contain two tables. The rst table describes the

format of a Modbus command request while the second table contains the format of the

command’s response.

Then the next section,

Modbus Register Maps

, provides additional information about

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 128 129

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