HART Multiplexer Master KFD2-HMM-16
Appendix
28
Subject to reasonable modifications due to technical advances.
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Appendix
6.1
Supported commands
The following tables show the HART commands supported by the multiplexer, ordered by the three groups
"Universal", "Common-practice" and "Device specific" commands (see also section 2.2). The read com-
mands are caracterised by
!
and the write commands by
"
.
The "Universal" and "Common-practice" commands are described in detail in /1/. In this section only the
functions are explained, not the data structure of the lower layer of the HART protocol.
"Universal" commands:
Command
Action
Meaning
0
!
Read unique identifier
12 bytes device identifier are given in the response.
1
!
Read HART variables
(process values)
Commands are only supported for compatibility purpo-
ses and are without any meaning. Used with transmitters
(e.g. SCAN function) they have the following meanings:
1: Read primary variable
2: Read primary variable as current (in mA) and percent
of range
3: Read primary variable as current (in mA) and four
(predefined) dynamic variables
2
!
3
!
6
"
Write polling address
This command is never accepted and the messages
"Access restricted" or "Busy" (see section 5.3.2) will be
returned.
11
!
Read unique identifier associated
with tag
A response will contain 12 bytes device identifier, if the
given tag complies to the tag of the multiplexer.
12
!
Read "Message"
Read the 32 digit message (see also 17).
13
!
Read tag, description and date
Read the 8 digit tag, the 16 digit description and the
date.
17
"
Write "Message"
Write the 32 digit message (see also 12).
18
"
Write tag, description and date
Write the 8 digit tag, the 16 digit description and the
date.
