Spectrum Controls 1734sc-IE2CH - Manual (Page 47)

Chapter 4: IExCH and HART 4-7
User’s Manual Pub. 0300257-01 Rev. A
notify the user when to send the Get HART Device Information message to retrieve the
cached data. See Table 3-4 and Table 3-5.
Table 4-6 (HART Refresh Sequence)
Commands sent to re-fresh Device Information on Configuration Change Detected
Command: Definition: Comment:
38 Reset Configuration Changed bit
12 Read Message
13 Read tag, descriptor, and date.
15 PV upper and lower range values
16 Read final assembly Number.
48 Read Additional Device Status
50 Read dynamic variable assignments.
The following table describes the class, service code and instances required to send the
Get HART Device Information message.
Table 4-7 (Get HART Device Information)
Unconnected Message
Field
Value Definition
Message Type “CIP Generic”
Service Code 0x4D Get Device Information
Class Name 0x035D HART Object
Instance Name 1-4 Selects channels 0 through 3
Object Attribute None, leave this field blank
Request Size 0 No Request Data
Reply Size 2-120 bytes
(2) Size when Device information not
available
(120) Size when valid Device
Information returned Number of Data bytes
returned
The following tables describe the possible message responses.
Table 4-8 (Request Data)
HART Get Device Information - Request packet structure
Get currently cached Device Information for a given channel.
Offset
Field Value Definition
No Request Data