CM4 Four-Point Continuous Monitor
CM4 Technical Manual
E-11
Get Point Configuration - 0x35
This command queries an individual point for its current configuration.
Command packet to instrument:
Command Code (0x35) - 1 byte
Point Flag - 1 byte
bits 0-1: Point Number
00 = Point 1
01 = Point 2
10 = Point 3
11 = Point 4
bits 2-7: Undefined
Response packet from instrument:
Command Code (0x35) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes
Point Status Flag - 1 byte
bit 0: Point Enable/Disable bit
0 = Disabled
1 = Enabled
bits 1-2: Point locked status
00 = Normal (No point lock-on)
01 = Lock-on for this point
10 = Lock-on for another point
11 = Undefined
bits 3-7: Undefined
MDA Gas Abbr. - 6 bytes (not null terminated)
Gas Table number - 1 byte (0 is the first table)
Format Code - 1 byte
Alarm Level 1 - 2 bytes
Alarm Level 2 - 2 bytes
20 mA - 2 bytes
Full Scale - 2 bytes
Point ID - 20 bytes
Status - 1 byte
0x00 = Point read
0xff = Error
Get Alarm History - 0x36
This command queries the unit for any alarms. The unit saves only
the 16 most recent alarms regardless of point. The alarms can all be
on one point or there can be alarms from several points.
Command packet to instrument:
Command Code (0x36) - 1 byte
Response packet from instrument:
Command Code (0x36) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes
# of Alarms - 1 byte
(alarm data, up to 16 possible)
CM4 Date of Alarm - 2 bytes
CM4 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
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