Spectrum Controls 1756sc-OF8H Series A - Manual (Page 94)

80 ControlLogix ™ Analog HART Modules
Get HART Device Information
The Get HART Device Information command is used to gather the device
specific information for the connected HART device. The data that is
retrieved can be seen in table 7.7. The information that is gathered by this
command is similar to the information gathered from the auto-acquisition
process. The key difference is that the Get HART Device Information
command pulls the data that has been stored in the module RAM and not
directly from the field device.
Table 7.7 (Get HART Device Information Command)
HART Get Device Information – command message packet structure
Get currently cached Device Information for a given channel.
Field
Value Definition
Unconnected Message Header
HART Channel
Number
0x00 – 0x07 (1 byte) Module input channel number for
HART command
Command Number 0x03 (1 byte) The command number to obtain
HART device information
Table 7.8 (Response If Device Information Is Not Available)
HART Get Device Information - reply packet structure
Field
Value Definition
Unconnected Message Header
HART Channel
Number
0x00 – 0x07 (1 byte) Module input
channel number
for HART
command
Status (1 byte)
34 = RUNNING
35 = DEAD (bad request)
Command status
Count (1 byte) Set to 1
Handle 0 Fill byte of zero to
keep command
response common
among all replies.