Emerson 5300 User Manual

00809-0500-4530, Rev AA

October 2010

Rosemount 5300/5400 Series

1-20

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

Table 1-10.  Modbus ASCII 
Communication Parameters

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

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

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

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).

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

Baud Rate

9600

Start Bits

One

Data Bits

Seven

Parity

None

Stop Bits

One