Rosemount 5300 Series with HART® to Modbus® Converter
May 2016
Reference Manual
00809-0100-4530, Rev DD
392
Rosemount 5300 Series with HART® to Modbus® Converter
Table J-9. Letters and Expressions Used in Previous Tables
J.8.5
Modbus ASCII communication setup
The parameter, default, and configurable values are shown in
below.
Table J-10. Modbus ASCII Communication Parameters
To reset the communication parameters to default Modbus ASCII settings, use the following
Modbus message:
HMC M1
Letter
Description
nn
nn is used to identify slave to respond,
nn is a number 00-99 or ** (wildcard).
The EmulCtrl Address Holding register can be configured to a higher value than 99. In
that case, the address will be truncated to 99.
mm
mm is the new ID number for the slave; mm is a number 00-99.
x
x is the number of floats returned when slave receives Unn?, x is a number 0-2.
cccc
Is the 16 bit CRC checksum, cccc are hexadecimal characters.
ddd.dd
ddd.dd is the distance value from slave 1. Note that the first d can also be a ‘-’ (minus).
Float 1
Slave 1 PV.
Float 0
Slave 1 SV.
fff
The temperature value. Configured by Holding Register 3208 in HMC.
(1)
1.
Any of the four available variables from any of the five HART slaves can be selected as the temperature source.
The least four significant bits (bit 0-3) select the variable number. Bits 4-7 select the HART slave address. If invalid values
are used, the temperature value will be invalid, with no Error bit set.
For example, if we want to use FV from HART Slave 3 as temperature source, we have to write the value 34 Hex (52
decimal).
eeee
An error value.
Bit 0: Invalid SV value (Float 0).
Bit 8: Invalid Temperature value.
Bit 12: Invalid PV value (Float 1).
Wwww
A warning value, not used in this implementation.
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
