Spectrum Controls 1734sc-OE2CIH - Manual (Page 56)

4-20 Chapter 4: OE2CIH and HART
User’s Manual Pub. 0300272-01 Rev. A.0
Request Succeeded Reply
HART Read Dynamic Variables - Reply packet structure
Reply Size = 36 bytes
Offset Field Value Definition
31 FV Status (1 byte) 1 byte status from Command 9
OR if Rev 5 device:
0×C0 = Connected and Device
provides this value in CMD 3 (that
is, does not truncate)
0×00 = Not Connected
32-35 Loop Current (Float–4 bytes) Device reported digital loop current
value. (Value from Cmd 3 for Rev 5
devices or Cmd 2 if later than Rev
5 device)
Table 4-14 Read Additional Device Status (Service Code = 4C)
Unconnected Message
Field Value Definition
Message Type CIP Generic
Service Code 0×4C Read Additional
Status
Class Name 0×035D HART Object
Instance 0
1 to n Selects All Channels
Selects channel n-1
Object Attribute None, leave this field blank
Request Size 0 No Request Data
Reply Size 2 to 448 bytes
(2) Size when information not
available(Instance 1 to 16)
(28) Up to this Size when valid Information
returned for a single channel(Instance 1 to n)
(28*n) Fixed size returned for Instance 0 Number of Data
bytes returned
Request Data
HART Read Extended Status - Request packet structure
Request Size = 0
Offset
Field Value Definition
No Request Data