Spectrum Controls 1734sc-OE2CIH - Manual (Page 54)

4-18 Chapter 4: OE2CIH and HART
User’s Manual Pub. 0300272-01 Rev. A.0
Table 4-13 Read Dynamic Variables (Service Code = 4B)
Unconnected Message
Field Value Definition
Message Type CIP Generic
Service Code 0×4B Get Device
Information
Class Name 0×035D HART Object
Instance 1 to n Selects channel n-1
Object Attribute None, leave this field blank
Request Size 0 No Request Data
Reply Size 2 to 36 bytes
(2) Size when information not available
(36) Size when valid Information returned Number of Data
bytes returned
Request Data
HART Read Dynamic Variables - Request packet structure
Request Size = 0
Offset Field Value Definition
No Request Data
Request Failed Reply
HART Read Dynamic Variables - Reply packet structure
Reply Size = 2
Offset Field Value Definition
0 Status 34 = DR_RUNNING
(No Device or
connection process
not completed)
35 = DR_DEAD
(Channel is not HART-
enabled) Command status
1 Pad 0 Pad byte