Spectrum Controls 1756sc-OF8H Series A - Manual (Page 97)

Chapter 7: HART Channel Configuration, Data, and Status 83
Note: If the resume command is received, without previously receiving a
suspension command, it will be ignored.
Note: The selected channel will resume normal HART operations three
minutes after the Suspension command has been received by the module.
Pass-through for that channel resets the timer to 3 minutes.
Table 7.10 (HART Suspend and Resume Command)
HART Channel Suspend/Resume command request – command message packet structure
Field Value Definition
Unconnected Message Header
HART Channel Number
0x00 – 0x07 (1 byte) Enabled HART channel
number
Command Number (1 byte)
0x05: Suspend
0x06: Resume
The command number to
suspend or resume
Table 7.11 (HART Suspend and Resume Reply Packet)
HART Channel Suspend/Resume command request – reply packet structure
Field Value Definition
Unconnected Message Header
HART Channel Number
0x00 – 0x07 (1 byte) Echo of the HART channel
number received
Status (1 byte)
00 = SUCCESS
35 = DEAD
Command status
Count (1 byte) Set to 1
Handle 0 Fill byte of zero to keep
command response common
among all replies.
The command status, the second byte in the reply packet for the module
specific command, can return two different responses, SUCCESS, 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 number is an enabled channel
• The identified HART channel finished all of the start-up connection
process.
• The I/O module will not be checking for matching set of suspend/
resume commands. This means, if already suspended, and receives
another suspend, SUCCESS will be returned still. Similarly if the
system is operating as normal, and receives a resume command, it will