Name: Hach sc200
Brand: Hach
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Section 3,

ModBUS

ModBUS Addressing

The ModBUS slave address has a valid range of 1-247.

• 247 is the default value.

This address may be set by:

• The Ultima X Controller:

• Send an address command with the desired value.

• The Ultima X Calibrator:

• Press the ADDRESS button once to display the current setting.

• The ZERO button increments the address number

• The SPAN button decrements the address number

• Range for Calibrator is 1 - 32; use Controller for other

addresses

• Press the ADDRESS button again to save the new address.

• A ModBUS controller by writing to the corresponding register in the

data table.

ModBUS Communications

• The communications protocol is ModBUS RTU over an RS-485

hardware network.

• The default settings for communications parameters are 19200

baud and even parity.

• The stop bits are fixed at 1 stop bit.

• For data types that are larger than one word, the most significant

word is located in the first register (big-endian).

Table 3-1. Supported ModBUS Function Codes

FUNCTION

NUMBER DESCRIPTION

3 Read Holding Registers

5 Write Single Coil

6 Write Single Register

16 Write Multiple Registers

3-1

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