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Command
Write SCAN status of up to 31
"
137
transmitters
Read cumulative responses of up
!
138
to 27 transmitters
Reset cumulative responses of up
"
139
to 35 transmitters
Read transmitter counts of tries
!
140
and failures of up to 16 transmit-
ters
Reset transmitter counts of tries
"
141
and failures of up to 16 transmit-
ters
Read counts of host communicati-
!
142
ons
Reset counts of host communicati-
"
143
ons
! Read retry limits
144
"
145
Write retry limits
Read the selected SCAN com-
!
146
mand
"
147
Select SCAN command
! Read SCAN status
148
"
149
Write SCAN status
! Read master type (gender)
150
"
151
Write master type (gender)
! Read loop search type
152
"
153
Write search type
"
154
"Rebuild" up to 83 loops
Pass through host command to
"
155
transmitter and transmitter
response to host
Read multiplexer table (module
!
156
table)
(16 multiplexers)
Write multiplexer table (module
"
157
table)
(16 multiplexers)
Subject to reasonable modifications due to technical advances.
30
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Action
For the given long frame addresses, this command sets
the SCAN status of the transmitters (0=disable SCAN,
1=enable SCAN)
This command returns the OR-combination of commu-
nication errors and status response bits.
This command resets the cumulative responses.
Communication statistic that contains the number of
commands sent to the transmitter and the number of
commands that failed.
Reset the communication statistic.
Communication statistic concerning the multiplexer.
Reset the communication statistic.
Retries in case of "Busy": 0 ... 11 (default is 0);
Retries in case of communication errors: 0 ... 11 (default
is 2).
During SCAN the HART commands 1, 2 or 3 (see
above) can be executed.
With these commands the status of the SCAN function
is set or read, respectively (see section 2.1.6).
0: SCAN function disabled (default after power-up)
1: Normal SCAN function activated
2: Special SCAN function activated (see 158, 159)
1 = Primary master (default),
0 = Secondary master.
The loop search type defines the polling address(es) for
a transmitter that did not respond during several
requests (disappeared) is searched (see also command
129).
0: Single transmitter, 4 mA ... 20 mA (single ana-
1: Single transmitter, unknown (single unknown)
2: Reserved for multidrop
see section 2.1.6.
By this any command can be passed to a field device
and the response can be evaluated - without any modifi-
cation by the multiplexer.
This command returns the multiplexer table (see 157).
This is to select which of the multiplexers (master and
15 slaves) are connected (2 bytes, bit coded).
HART Multiplexer Master KFD2-HMM-16
Meaning
logue)(only polling address 0) (default)
(first one of the polling addresses 0 to 15)
Note: The search procedure without any connected
transmitters is 16 times longer because all 16 polling
addresses are checked!
Appendix
Copyright Pepperl+Fuchs, Printed in Germany
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