Delta Controls 2HTDCAL - Manual (Page 8)

Commands and HART Numbers used by 2HT
(Only user-accessible commands are listed)
Number Class Local Description
0 U V Read Unique Identifier 1
Read Primary Variable
2 U M Read PV Current and Percentage of Range
3 U M Read Dynamic Variables and PV Current
6 U Write Polling Address
12 U V Read Message
13 U V Read Tag, Descriptor, Date
14 U V Read Primary Variable Sensor Information
15 U V Read Primary Variable Output Information
16 U V Read Final Assembly Number
17 U 1
Write Message
18 U 1 Write Tag, Descriptor, Date
34 C 1 Write Primary Variable Damping Value
35 C 1 Write Primary Variable Range Values
36 C 2 Set Primary Variable Upper Range Value
37 C 2 Set Primary Variable Lower Range Value
38 C 1 Reset Configuration Changed Flag
40 C 2 Enter / Exit Fixed PV Current Mode
41 C 1 Perform Transmitter Self Test
42 C 1 Perform Master Reset
43 C 2 Set Primary Variable Zero
44 C 1 Write Primary Variable Units
45 C 2 Trim Primary Variable Current DAC Zero
46 C 2 Trim Primary Variable Current DAC Gain
47 C 1 Write Primary Variable Transfer Function
48 C Read Additional Status
53 C Write Secondary Variable Units (Temperature)
COMMANDS U Universal C Common D Device Specific
LOCAL ACCESS M Monitor V View
(D-CAL) 1 Access Level 1 2 Access Level 2
7
{ACCESS 2}
With the local display fitted, access to the zero and span keys on the top circuit board is
restricted, and their operation is disabled by the software. The two functions are now available
through the menu structure. They may look similar to th e trim functions but it must be remembered
they change only the upper and lower range values, which represent the analogue output. The
two keys do not modify the factory calibration.
NB To give a reversed output, apply the higher pressure when the zero key is pressed and vice
versa.
24
{ZERO KEY}[SELECT]
This command is the same as pressing the zero key on the top board. The lower range value
(LRV) is set to the applied pressure and is represented by 4 mA.
Before the value is saved, the desired pressure must be applied to the instrume nt, and allowed
to settle.
{HIT SAVE} will be displayed, there are two choices :-
[SELECT] or To abort and return to the {ZERO KEY} menu.
[CHANGE]
[[SELECT]] Used to store the new lower range value, {SAVED} will be displayed
to show that the command is successful.
{SPAN KEY}[SELECT]
This command is the same as pressing the span key on the top board. The upper range value
(URV) is set to the applied pressure and is represented by 20 mA.
Before the value is saved, the desired pressure must be applied to the instrument, and allowed
to settle.
{HIT SAVE} will be displayed, there are two choices :-
[SELECT] or To abort and return to the {SPAN KEY} menu.
[CHANGE]
[[SELECT]] Used to store new upper range value, {SAVED} will be
displayed to show that the command is successful.
1 U M