HART Multiplexer System KFD*-HM*-16
Appendix
2018-04
83
154 Scan up to 83 specified
signal loops.
See chapter 7.1.5 and 7.2.1.
155 Pass through host command
to the device and response to
the host.
This enables any command to be sent to a field device and
its response evaluated by the multiplexer device without any
changes.
156 Read multiplexer table.
(16 multiplexer devices)
Reads the specified multiplexer table, see command 157.
157 Write multiplexer table.
(16 multiplexer devices)
Determines which multiplexer devices (multiplexer master
and up to 15 multiplexer slaves) are assigned
(2 byte, coded bit by bit).
158 Read special
scan parameters.
The current special parameters and the field device data
(if available) for the specified signal loop is provided.
These include:
• Number of the signal loop
• Fault flag (0 = OK, 1 = special scan is not active)
• Polling address, always 0, as there is no multidrop
• The minimum number of data bytes for the special scan
• The scan command used
• Extended address
• Number of available data bytes
• Data byte content
159 Write special
scan parameters.
For the specified signal loop and the polling address
(must always be 0), the minimum number of data bytes
(0 to 62) and the scan command to be used can be written.
160 Read delay period for
channel change.
When changing the communication channel (0 to 255),
the multiplexer can include a waiting period (0 ms to 300 ms)
before HART commands are sent to the channel.
161 Write delay period for
channel change.
Table 9.3
1
The search process is 16 times longer with no field device connected, as all 16 polling addresses are checked.
Command Action Meaning
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