To reset the communication parameters to default Modbus ASCII settings, use the
following Modbus message:
HMC M1
Modbus ASCII parameter configuration
You want to use address 246 for the Rosemount 5300 Level Transmitter and the host uses
the following parameters:
Table 5-11: Parameters Used by the Host (In Case of Modbus ASCII, Example)
Parameter Value
Baud Rate 9600
Start Bits One
Data Bits Seven
Parity None
Stop Bits One
To configure the Rosemount 5300 Level 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).
D7
D indicates that the following data bits are to be used (7 = seven, 8 = eight).
PN
P identifies the following letter as parity type (O = odd, E = even, and N = none).
S1
S indicates that the following figure is the number of stop bits (1 = one, 2 = two).
Note
Start bits are not configurable and cannot be set.
Configuration Reference Manual
April 2019 00809-0100-4530
152 Rosemount 5300 Level Transmitter
To Next Page
Loading...
