Spectrum Controls 1734sc-IE2CH - Manual (Page 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
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)
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