ST100A Series Flow Meter OPERATION
Fluid Components International LLC 59
HART Command List Reference
The HART commands are divided into three classes.
● Universal Commands
● Common Practice Commands
● Device Specific Commands
Barring no communication error, a field or slave device returns a response code as part of the 2-byte status response to a command. Refer
to Command Status Bytes on page 73. The ST100A Series response codes listed in the following command summaries are a subset of the
response codes listed in the HART specification.
ST100A Series HART Universal Commands
The ST100A Series HART supports Universal Commands 0 through 22 and 38 and 48. Commands 4 and 5 are reserved under Universal
Command Specification Rev. 7.1 (HCF_SPEC-127, Revision 7.1) and not implemented in this specification. There is no HART command
10. Table 12 below summarizes the instrument’s HART Universal command set and the data associated with each command.
Table 12 – HART Universal Commands
Command 0: Read Unique Identifier
Minimum number of preambles from master to slave
HART Protocol Revision Number: 7
(Most Significant 5 Bits) Hardware Revision Level
Physical Signaling Code: 00 = Bell 202 Current (4-20 mA)
Minimum number of preambles from the slave to master
Maximum Number of Device Variables
Configuration Change Counter
Extended Field Device Status
Manufacturer ID Code: 166
DEC
/00A6
HEX
(FCI)
Private Label Distributor Code
Device Profile = 1 “HART Process Automation Device”
See Table 17, page 74, for response code list.
Command 1: Read Primary Variable (Flow Units, & Flow Value)
Primary Variable Units Code
See Table 17, page 74, for response code list.
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