Spectrum Controls 1734sc-OE2CIH User Manual
Page 55
Chapter 4: OE2CIH and HART
4-19
User’s Manual Pub. 0300272-01 Rev. A.0
Request Succeeded Reply
HART Read Dynamic Variables - Reply packet structure
Reply Size = 36 bytes
Offset Field
Value
Definition
0
Status
(1 byte)
Command status, 00 = SUCCESS
1
HART Command Status
(1 byte)
HART Device reply Status Byte # 1
2
HART Field Device
Status
(1 byte)
HART Device reply Status Byte # 2
3
HART Ext Device Status
(1 byte)
Status Byte returned from Cmd 9 or
0 for HART rev 5 devices
4-7
PV
(Float–4 bytes)
HART Primary variable
8-11
SV
(Float–4 bytes)
HART Secondary variable
12-15
TV
(Float–4 bytes)
HART Third variable
16-19
FV
(Float–4 bytes)
HART Fourth variable
20
PV Units
(1 byte)
Primary variable unit code
21
SV Units
(1 byte)
Secondary variable unit code
22
TV Units
(1 byte)
Third variable unit code
23
FV Units
(1 byte)
Fourth variable unit code
24
PV Assignment Code
(1 byte)
Primary variable assignment code
25
SV Assignment Code
(1 byte)
Secondary variable assignment
code
26
TV Assignment Code
(1 byte)
Third variable assignment code
27
FV Assignment Code
(1 byte)
Fourth variable assignment code
28
PV Status
(1 byte)
1 byte status from Cmd 9 (Rev 6 or
later)
OR
if Rev 5.x device:
0×C0 = Connected
0×00 = Not Connected
29
SV Status
(1 byte)
1 byte status from Cmd 9
OR if Rev 5 device:
0×C0 = Connected and Device
provides this value in CMD 3 (that
is, does not truncate)
0×00 = Not Connected
30
TV Status
(1 byte)
1 byte status from Cmd 9
OR if Rev 5 device:
0×C0 = Connected and Device
provides this value in CMD 3 (that
is, does not truncate)
0×00 = Not Connected