User Manual

Chapter 7: Enabling and Using HART on the 1769sc-IF4IH0
U ser 's M a n u a l 0 300 21 5- 03 R ev. A
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Table 7-1 6 (HART Pa ss-Thro ugh Query Command)
HART pass through c ommand complete query - co mmand mes sage packet str ucture
Field Value Definition
HART Channel
Number
0x00 – 0x03 (1 byte) Module input
channe l number for
HART command
Command Number 0x0C (1 byte) The command
number
Handle (1 byte)
1-255
The hand le from
command request
reply
If the data associated with the handle i s not yet available, or invalid, the following reply
message will be returned.
Table 7-17 (HART Pass-Through Query Reply NOT SUCCESS)
HART pass through c ommand complete query - reply p acket struct ure
Field Value Definition
Unconnected Message Header
HART Channel
Number
0x00 – 0x07 (1 byte) Module input
channe l number for
HART command
Status (1 byte)
34 = DR_R UNNING
35 = DR_DEAD (bad request)
Command status
Count (2 bytes) (Command Number 0x0C) Length of Handle +
HART Response
Data in bytes (if
Success)
Handle (1 byte) The handle from
command complete
query
When data associated with the buffer becomes available, meaning a "success" response,
the reply will be formatted as follo ws:
Table 7-1 8 (HART Pa ss-Thro ugh Query Reply SUCC ESS)
HART pass through c ommand complete query - reply p acket struct ure
Field Value Definition
Unconnected Message Header
HART Channel
Number
0x00 – 0x07 (1 byte) Module input
channe l number for
HART command
Status (1 byte)
00 = SUCCESS
Command status
Count (1 byte) (Command Number 0x04)
(2 bytes) (Command Number 0x08, 0x0C)
Length of Handle +
HART Response
Data in bytes (if
Success)
Handle 1-255 The handle from
command complete
query
HART Command
Response Data
Size is the entire HART device response size
in bytes. The si ze does not i nclude preambles
bytes.
The HART device’s
response to the
command (i f
Success)