Emerson 5400, 5300 specifications Modbus Ascii Communication Setup, HMC M1 A246 B9600 D7 PN S1

Rosemount 5300/5400 Series

Manual Supplement

00809-0500-4530, Rev AA October 2010

Modbus ASCII Communication Setup

Table 1-10. Modbus ASCII Communication Parameters

Table 1-11. Parameters Used by the Host (in case of Modbus ASCII, example)

The parameter, default, and configurable values are shown in Table 1-10 below.

Parameter	Default value	Configurable values
Baud Rate	9600	1200, 2400, 4800, 9600, 19200
Start Bits	One	One
Data Bits	Seven	Seven, Eight
Parity	None	None, Odd, even
Stop Bits	One	One or Two
Address	1	1-255

To reset the communication parameters to default Modbus ASCII settings, use the following Modbus Message:

HMC M1

Modbus ASCII Parameter Configuration Example

You want to use address 246 for the 5300/5400 transmitter and the host uses the following parameters:

Parameter	Value
Baud Rate	9600
Start Bits	One
Data Bits	Seven
Parity	None
Stop Bits	One

To configure the 5300/5400 transmitter to communicate with the Host in this example, the following text string is written to the Modbus Message area.

HMC M1 A246 B9600 D7 PN S1.

NOTE

Include all the parameters when writing to the message area.

Note that an address must be unique on the bus.

HMC: These three letters are used for safety and will eliminate the risk of changing the configuration data by mistake.

M1: This means that the Modbus ASCII protocol is to be used.

A246: A indicates that the following number is the new address (address 246). Leading zeroes are not needed.

B9600: B indicates that the following number is the new baud rate (1200, 2400, 4800, 9600, 19200).

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