ProSoft Technology 5228-DFNT-HART - Manual (Page 31)

ProLinx-HART ♦ ProLinx Gateway HART Protocol Configuration
HART Master with Analog I/O Driver Manual
ProSoft Technology, Inc. Page 31 of 104
October 13, 2011
3.3 [HART PORT x COMMANDS]
The [HART PORT x COMMANDS] sections of the configuration file contain the user-
defined HART command lists for each channel. The commands in these lists are sent to
slave devices attached to the HART channels. The module supports up to 100
commands per channel.
3.3.1 Command List Overview
The ProLinx-HART module uses a command list to interface with HART slave devices.
The commands in the list specify
the slave device to be addressed
the function to be performed (read or write)
the registers in the internal database to be associated with the device data.
There is a separate command list for each HART channel, with up to 100 commands
allowed per channel. The command list is processed from top (Command #0) to bottom
(Command #99), then the process is repeated.
A poll interval parameter is associated with each command to specify a minimum delay
time in seconds between the issuance of a command. For example, a poll interval of 10
executes the command no more frequently than every 10 seconds.
Write commands have a special feature, as they can be set to execute only if the data in
the write command changes. If the register data values in the command have not
changed since the command was last issued, the command will not be executed. If the
data in the command has changed since the command was last issued, the command
will be executed. Use of this feature can lighten the load on the HART network. In order
to implement this feature, set the enable code for the command to a value of 2.
The module supports all the Universal (page 42) and Common Practice (page 55)
commands, as well as device specific commands. A Device Specific command is
supported without any translation of the data.