Spectrum-controls 1734sc-OE2CIH Manuel d'utilisateur télécharger pdf (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

Status

(1 byte)

Command status, 00 = SUCCESS

HART Command Status

(1 byte)

HART Device reply Status Byte # 1

HART Field Device

Status

(1 byte)

HART Device reply Status Byte # 2

HART Ext Device Status

(1 byte)

Status Byte returned from Cmd 9 or

0 for HART rev 5 devices

4-7

(Float–4 bytes)

HART Primary variable

8-11

(Float–4 bytes)

HART Secondary variable

12-15

(Float–4 bytes)

HART Third variable

16-19

(Float–4 bytes)

HART Fourth variable

PV Units

(1 byte)

Primary variable unit code

SV Units

(1 byte)

Secondary variable unit code

TV Units

(1 byte)

Third variable unit code

FV Units

(1 byte)

Fourth variable unit code

PV Assignment Code

(1 byte)

Primary variable assignment code

SV Assignment Code

(1 byte)

Secondary variable assignment

code

TV Assignment Code

(1 byte)

Third variable assignment code

FV Assignment Code

(1 byte)

Fourth variable assignment code

PV Status

(1 byte)

1 byte status from Cmd 9 (Rev 6 or

later)

if Rev 5.x device:

0×C0 = Connected

0×00 = Not Connected

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

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

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 73 74

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Spectrum-controls 1734sc-OE2CIH Manuel d'utilisateur Page 55

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