Modbus Instructions

2Configuration

The Modbus communication board is equipped with a set of ten dip switches that are used to set the board configuration (address, baud rate, and parity settings). The first eight are used to set the address of each board. The ninth baud rate. The tenth is parity.

Figure 2-1_Modbus Communication Board

DIP SWITCHES

LED’S

Addressing

The Modbus addressing space is comprised of 256 different addresss.

0 is reserved for broadcast messages from the master device

1 - 247 are free to use for each unique device

248 - 255 are reserved

To set the Modbus address the dip switches can be set in either the 0 position or the 1 position. For switches set to the 1 position their value will be added together to determine the address.

For each switch set to the 1 position it has the following value:

Dip switch 1 = 1

Dip switch 2 = 2

Dip switch 3 = 4

Dip switch 4 = 8

Dip switch 5 = 16

Dip switch 6 = 32

Dip switch 7 = 64

Dip switch 8 = 128

Any dip switch set to 0 has a value equal to 0.

Example:

To set the address of the Modbus board to 50, dip switches 2, 5, and 6 have to be set to the 1 position. The address is determined by adding the values of all the dip switches together.

Address = Value of Dip switch 1 + Value of Dip switch 2 + Value of Dip switch 3 + Value of Dip switch 4 + Value of Dip switch 5

+Value of Dip switch 6 + Value of Dip switch 7 + Value of Dip switch 8

In this example:

Address = 0 + 2 + 0 + 0 + 16 + 32 + 0 + 0 = 50

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Lochinvar 1.0- 1.3- 1.5 operation manual Configuration, Addressing

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