Honeywell VC4 User Manual page 145

VC4™ Time - 2 bytes
# of Alarms - 1 byte
(alarm data, up to 16 possible)
VC4™ Date of Alarm - 2 bytes
VC4™ Time of Alarm - 2 bytes Gas Abbr. 6 bytes
Point # - 1 byte
bits 0-1: Point #
00 = Point 1
01 = Point 2
10 = Point 3
11 = Point 4
bits 2-7: Undefined
Format Code - 1 byte
Conc. - 2 bytes
Alarm Level - 1 byte
bit 0: Alarm Level
0 = Level 1
1 = Level 2
bits 1-5: Undefined
bit 6: Previously Read
0 = new (not previously read)
1 = old (previously read)
bit 7: Undefine
Get Current Point Status - 0x37
This command queries an individual point for its current status. Command packet to
instrument:
Command Code (0x37) - 1 byte
Point # - 1 byte
bits 0-1: Point #
00 = Point 1
01 = Point 2
10 = Point 3
11 = Point 4
bits 2-7: Undefined
VC4™ 145 User Manual