Honeywell VC4 User Manual page 153

Get One Alarm - 0x47
This packet returns the oldest unread entry from the alarm history. It duplicates the
functionality of packet 0x36 in a form that some masters may find more convenient. Note that
this packet causes an alarm to be marked as read in the same way as packet 36. If no unread
entries exist in the history, the response packet will contain zeros in the alarm date field.
Command packet to slave:
Command Code (0x47) - 1 byte
Response packet from slave:
Command Code (0x47) - 1 byte
VC4™ Date - 2 bytes
VC4™ Time - 2 bytes
Alarm Date - 2 bytes
Alarm Time - 2 bytes
Gas abbreviation - 6 bytes (not null terminat'd)
Point number - 1 byte
bits 0-1 point number
bits 2-7 undefined
Concentration - 4 bytes (in IEEE floating point format)
Alarm Level - 1 byte
bit 0: alarm level
0= level 1
1= level 2
bits 1-7: undefined
VC4™ 153 User Manual