Spectrum-controls 1734sc-IE2CH Uživatelský manuál stáhnout pdf (Strana 51)

Chapter 4: IExCH and HART 4-11

User’s Manual Pub. 0300257-01 Rev. A

Table 4-13 (Reply Data)

HART Ladder Passthrough Init - Reply packet structure

Offset Field Value Definition

Unconnected Message Header

0 Status 32 = Busy (Queues full)

33 = DR_INITIATE

(passthrough success)

35 = DR_DEAD

Command Status

Note: HART Cmds

59,107,108, & 109 are not

allowed and will always

return DR_DEAD.

1 HART

Command

0-255 (1 byte) Echo of HART command

2 Handle 1-255 (1 byte) Handle used in Query

operation

3 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)

Pass-through Query

The following table describes the class, service code and instances required to send the

Pass-through Query message.

Table 4-14 (Pass-through Query)

Unconnected Message

Field Value Definition

Message Type “CIP Generic”

Service Code 0x4F Passthrough Init

Class Name 0x035D HART Object

Instance 1-4 Selects channel 0-3

Object Attribute None, leave this field blank

Request Size 1 byte Handle for Query

Reply Size 6-260 bytes Number of Data bytes returned

The following tables describe the possible message responses.

Table 4-15 (Request Data)

HART Ladder Passthrough Query - Request packet structure

Offset Field Value Definition

0 Handle 1-255 (1 byte) Handle for Query

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 83 84

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