Spectrum-controls 1734sc-OE2CIH Manual do Utilizador descarregar pdf (Página 57)

Chapter 4: OE2CIH and HART 4-21

User’s Manual Pub. 0300272-01 Rev. A.0

Request Failed Reply

HART Read Additional Status - Reply packet structure

Reply Size = 2

Offset

Field

Value

Definition

Status

34 = DR_RUNNING

(No Device or

connection process

not completed or re-

gathering device

info is in progress)

35 = DR_DEAD

(Channel is not HART

enabled)

Command status

Pad

Pad byte

Request Succeeded Reply

HART Read Extended Status - Reply packet structure

Instance n Reply Size = 2-28 bytes

(pad byte may be attached to end for 16 bit alignment)

Instance 0 Reply Size = 28*n

Note: Sending this message with Instance = 0 will reset the NewAdditionalStatus tag.

Offset

Field

Value

Definition

Status

00 = SUCCESS (1 byte)

Command status

Count

0-25 (1 byte)

Number of Status bytes available

2-26

Additional

Status Bytes

Additional Status bytes returned by

Command 48

For Class Instance(Instance=0) if

device doesn’t return any or all 25

bytes then the remaining are set to

Pad

Included if all 25 Additional Status

bytes returned or returning all n

Channels at once for Instance 0

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 73 74

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