Spectrum Controls 1756sc-OF8H Series A - Manual (Page 102)

88 ControlLogix ™ Analog HART Modules
Table 7.16 (HART Pass-Through Command Complete Query - Reply Packet Structure)
HART pass through command complete query - 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)
00 = SUCCESS
Command status
Count (1 byte) 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 size
does not include preambles bytes.
The HART device’s
response to the command (if
Success)
The command status, the second byte in the reply packet for the module
specific command, can return three different responses, SUCCESS,
RUNNING and DEAD. These responses echo the state of the module at
the time the command is sent. The conditions for each response are as
follows:
SUCCESS will be sent back under the following conditions:
• Command and HART Channel number are both valid.
• HART channel is enabled.
• Command handle matches currently active handle and the handle is in
the HOLD state.
• After replying with a SUCCESS, the handle will become inactive, thus
allowing for next pass-through or host initiated update of device
information.
RUNNING will be sent back under the following conditions:
• Command and HART Channel number are both valid.
• HART channel is enabled.
• Command handle matches currently active handle.
• HART channel is already in the state of handling a pass-through
command. Reply will be sent back without additional events triggered.