Spectrum Controls 1734sc-IE2CH - Manual (Page 45)

Chapter 4: IExCH and HART 4-5
User’s Manual Pub. 0300257-01 Rev. A
3. Every 2 minutes if bit remains set.
The following table describes the class, service code and instances required to send the
Read Additional Device Status message.
Table 4-1 (Read Additional Device Status)
Unconnected Message
Field
Value Definition
Message Type “CIP Generic”
Service Code 0x4C Read Additional Status
Class Name 0x035D HART Object
Instance 0
1-4
Selects All Channels
Selects channel 0-3
Object
Attribute None, leave this field blank
Request Size 0 No Request Data
Reply Size 2-112 bytes
(2) Size when information not available
(Instance 1-4)
(28) Up to this Size when valid
Information returned for a single
channel (Instance 1-4)
(56 if IE2CH) Fixed size returned for Instance
0
(112 if IE4CH) Fixed size returned for Instance
0 Number of Data bytes
returned
The following tables describe the possible message responses.
Table 4-2 (Request Data)
HART Read Extended Status - Request packet structure
Offset
Field Value Definition
No Request Data
Table 4-3 (Request Failed)
HART Read Additional Status - Reply packet structure
Offset Field Value Definition
0 Status 34 = DR_RUNNING
(No Device or
connection process
not completed or re-
gathering device
info is in progress)
35 = DR_DEAD
(Channel is not HART
enabled)
Command status
1 Pad 0 Pad byte