Spectrum Controls 1734sc-OE2CIH - Manual (Page 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
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 4-17 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
0 Handle 1 to 255 (1 byte) Handle for Query