Spectrum-controls 1734sc-OE2CIH Instrukcja Użytkownika Pobierz pdf (Strona 61)

Chapter 4: OE2CIH and HART 4-25

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

Reply Data

HART Ladder Passthrough Init - Reply packet structure

Reply Size = 4 bytes

Offset

Field

Value

Definition

Status

32 = Busy (Queues full)

33 = DR_INITIATE

(passthrough success)

35 = DR_DEAD

Command Status

Note: HART Commands 59, 107,

108, and 109 are not allowed and

will always return DR_DEAD.

HART Command

1 to 255 (1 byte)

Echo of HART command

Handle

1 to 255 (1 byte)

Handle used in Query operation

Queue Space

Remaining

Reason Code if

status = 35

(1 byte)

Number of queues still available for

this channel.

Reason Code is a diagnostic value

returned when message fails (Status

= 35)

Table 4-17 Ladder Pass-through Query (Service Code = 0×4F)

Unconnected Message

Field

Value

Definition

Message Type

CIP Generic

Service Code

0×4F

Pass-through Init

Class Name

0×035D

HART Object

Instance

1 to n

Selects channel n-1

Object Attribute

None, leave this field blank

Request Size

1 byte

Handle for Query

Reply Size

6 to 260 bytes

Number of Data

bytes returned

Request Data

HART Ladder Pass-through Query - Request packet structure

Request Size = 1 byte

Offset

Field

Value

Definition

Handle

1 to 255 (1 byte)

Handle for Query

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 73 74

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