Device Description Development

Can VARIABLE/COMMAND "item-name" be changed after a HART EDD is registered?
No, unfortunately, once a DD Item (such as a VARIABLE or COMMAND Name) has been registered at FieldComm Group it is given a unique Symbol Number for that DD...
Fri, 22 Nov, 2019 at 8:57 AM
How to use IF ... ELSE conditional on a "boolean-specifier" (i.e.,VALIDITY)
Define a conditional IF... ELSE for a boolean-specifier  such as  VALIDITY . opt:  Optional 1.  First, define the "attribute" of the ...
Fri, 22 Nov, 2019 at 8:31 AM
How to upgrade device specific "symbols.txt" to use Standard HART Commands
To preserve existing symbol IDs (in your device specific symbols.txt) when you upgrade to use new Standard COMMANDs/VARIABLEs, prefix the offending variable...
Fri, 22 Nov, 2019 at 10:31 AM
May I use Conditional on VARIABLE's TYPE (HART EDD)?
HART is NOT conditional.   The meaning of a parameter (ie, data) must never change (see Command Summary Spec, #4 below) 1 VARIABLE = 1 TYPE (no cond...
Mon, 25 Nov, 2019 at 8:08 AM
May I use "__TOKVER__" COMMAND/VARIABLE (HART EDD)?
HART is NOT conditional.   At no time may a command be deleted from any device (see Command Summary Spec, #3 below) INCORRECT #if __TOKV...
Mon, 25 Nov, 2019 at 8:08 AM
How to modify HART EDD to support Commands 50/51?
1.  IMPORT STANDARD _PV:   a) For all Dynamic Variables supported (see  Universal Command Specification, HCF_SPEC-127, FCG TS20127), REDEFINE the me...
Wed, 27 Nov, 2019 at 7:54 AM
How to use IF ... ELSE conditional on a "MENU Item"?
Define a conditional IF... ELSE for a  MENU Item Syntax IF...ELSE :  see How to use IF ... ELSE conditional on a "boolean-specifier" (i.e.,VAL...
Mon, 2 Dec, 2019 at 9:08 AM