4-26
Chapter 4: OE2CIH and HART
User’s Manual Pub. 0300272-03 Rev. B
Request Data
HART Ladder Passthrough Init - Request packet structure
Request Size = 2 to 257 bytes
2 to
256
HART Data bytes
0 to 255 (1 byte)
HART command data
Reply Data
HART Ladder Passthrough Init - Reply packet structure
Reply Size = 4 bytes
Offset Field
Value
Definition
0
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.
1
HART Command
1 to 255 (1 byte)
Echo of HART command
2
Handle
1 to 255 (1 byte)
Handle used in Query operation
3
Queue Space
Remaining
OR
Reason Code if
status = 35
(1 byte)
Number of queues still available for
this channel.
OR
Reason Code is a diagnostic value
returned when message fails (Status
= 35)
Table 4-18. 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
0
Handle
1 to 255 (1 byte)
Handle for Query
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