Field Device Development

For Command 48, our device does not have additional status, and thus do not have a method to trigger/clear the “More Status Available” bit. Will this be a problem?
It is not necessary to set More Status Available (MSA) for all Command 48 bits, however, you must provide a process to set a bit in Command 48...
Wed, 20 Jul, 2016 at 12:09 PM
Our device does not have a method for Write Protection (i.e. we don't have a jumper or switch that can be selected to enable write protection) - will this be a problem?
Write protection is optional, so this is not a problem.  Byte 15 of command 15 must return the value 251, None, when write protect is not implemented.
Fri, 29 Apr, 2016 at 8:56 AM
My unit code is not in the current specifications
There is an extensive list of unit codes for each technology within the respective specifications, however, there are less frequently implemented eng...
Fri, 16 Jun, 2017 at 10:37 AM
How does Burst-Mode function in a HART Product?
Burst-Mode is optional for a HART products but is strongly recommended. HART Burst-Mode supports the publishing of cyclical process data usi...
Mon, 18 Jul, 2016 at 11:18 AM
Why must Command 33 and Command 9 reply with Device Variable 246?
In HART Common Tables, Table 34, several standard Device Variable Codes are defined to allow access to the process measurements and loop current his...
Mon, 1 Aug, 2016 at 12:32 PM
What is an appropriate Gap Time?
Question: The specification says the time must be less than 1 character time, but no tolerance is specified.  0.5 (4ms) character is a reaso...
Fri, 30 Sep, 2016 at 10:14 AM
I would like to implement a special limit on a Command
The HART Specifications describe the expected behavior for each command. Anything other than the described standard behavior is considered manufacturer...
Fri, 30 Sep, 2016 at 9:47 AM
My device received an even parity message, should it respond?
All HART devices must be odd parity. All devices should reject even parity messages. See Token-Passing Data Link Layer Specification.
Fri, 30 Sep, 2016 at 9:38 AM
Are the tests and test specifications approved?
Members voted to approve the test specifications and the corresponding test cases. While every effort has been made to provide test cases consistent with ...
Wed, 10 Aug, 2016 at 9:59 PM
What engineering unit is TICKS?
There are 0.33 ticks/ms  Divide the number of ticks by 2.33 to solve for milliseconds.
Wed, 10 Aug, 2016 at 10:32 PM