Spectrum-controls 1734sc-OE2CIH Bedienungsanleitung PDF herunterladen (Seite 56)

4-20 Chapter 4: OE2CIH and HART

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

FV Status

(1 byte)

1 byte status from Command 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

32-35

Loop Current

(Float–4 bytes)

Device reported digital loop current

value. (Value from Cmd 3 for Rev 5

devices or Cmd 2 if later than Rev

5 device)

Table 4-14 Read Additional Device Status (Service Code = 4C)

Unconnected Message

Field

Value

Definition

Message Type

CIP Generic

Service Code

0×4C

Read Additional

Status

Class Name

0×035D

HART Object

Instance

1 to n

Selects All Channels

Selects channel n-1

Object Attribute

None, leave this field blank

Request Size

No Request Data

Reply Size

2 to 448 bytes

(2) Size when information not

available(Instance 1 to 16)

(28) Up to this Size when valid Information

returned for a single channel(Instance 1 to n)

(28*n) Fixed size returned for Instance 0

Number of Data

bytes returned

Request Data

HART Read Extended Status - Request packet structure

Request Size = 0

Offset

Field

Value

Definition

No Request Data

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 73 74

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