Get Current Point Status - 0X37 - Honeywell CM4 Technical Handbook

CM4 Four-Point Continuous Monitor

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
Response Packet from instrument:
Command Code (0x37) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes (If point is Disabled/Invalid/locked out, fill
with zeroes)
MDA Gas Abbr. - 6 bytes (not null terminated)
Format Code - 1 byte
Flow Rate - 2 bytes (current flow)
TWA Start Date - 2 bytes
TWA Start Time - 2 bytes
TWA End Date -2 bytes
TWA End Time - 2 bytes
TWA Conc. - 2 bytes
Last Conc. - 2 bytes (last reported conc.)
Alarm Status - 1 byte (0 none, 1 or 2 level) (Fill for all conditions)
Status - 1 byte
0x00 = Data valid
0x01 = Point Disabled (no data filled)
0x02 = Point Locked Out (no data filled)
0x04 = No TWA calculated
0x08 = No concentration available
0x10 = Alarm Simulation mode active
0xff = Invalid data
CM4 Technical Manual
Get TWA Time - 0x38
This command queries the three TWA output time in a 24-hour format.
Each of the TWA times are eight hours apart.
Command packet to instrument:
Command Code (0x38) - 1 byte
Response packet from instrument:
Command Code (0x38) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes
TWA time 1 - 2 bytes
TWA time 2 - 2 bytes
TWA time 3 - 2 bytes
Status - 1 byte
0x00 = Time read
0xff = Error in reading
Get Display Cycle Time - 0x39
This command queries for the length (in seconds) that the concentration
for each point is displayed while the unit is in the Monitoring mode.
Command packet to instrument:
Command Code (0x39) - 1 byte
Response packet from instrument:
Command Code (0x39) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes
Cycle Time - 1 byte
(valid 2-10 sec., default 4 sec.)
Status - 1 byte
0x00 = No error
0xff = Error
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