Set Relay State - 0X5F - Honeywell CM4 Technical Handbook

CM4 Four-Point Continuous Monitor

Set Relay State - 0x5F

This command allows you to configure the relay states. The relays
are normally de-energized, and can be configured to operate in the
energized fail-safe condition. When the relays are latched, they are
cleared by operator intervention. Non-latching relays are cleared
automatically once the concentration decreases below the alarm level
threshold, or the fault is corrected without operator intervention.
Command packet to instrument:
Command Code (0x5F) - 1 byte
Relay Flags - 1 byte
bit 0: Relay state
0 = De-energized
1 = Energized
bit 1: Relay latching state
0 = Non-latching
1 = Latching
bits 2-7: Undefined
Response packet from instrument:
Command Code (0x5F) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes
Status - 1 byte
0x00 = relays state set
0xff = Error, relays state not changed
CM4 Technical Manual
End Point Lock-on - 0x60
This command unlocks the unit from a single point lock-on to all other
points that are enabled. When this command is issued, a new TWA
start for all points.
Command packet to instrument:
Command Code (0x60) - 1 byte
Response packet from instrument:
Command Code (0x60) - 1 byte
CM4 Date: - 2 bytes
CM4 Time - 2 bytes
Status - 1 byte
0x00 = Points unlocked
0xff = Error
Start Point Lock-on - 0x61
This command locks the unit to one specific point. When this command
is issued, all other points are disabled and locked-on point continues
to monitor for concentration and TWA.
Command packet to instrument:
Command Code (0x61) - 1 byte
Point Lock - 1 byte
bits 0-1: point to lock on
00 = Point 1
01 = Point 2
10 = Point 3
11 = Point 4
Response packet from instrument:
Command Code (0x61) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes
Status - 1 byte
0x00 = Point locked
0x01 = Selected point not enabled
0xff = Error
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