Honeywell CM4 Operating Instructions Manual page 47

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End Point
Lock-on - 0x60
Start Point
Lock-on - 0x61
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
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
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
42
CM4 Protocol Manual
00 = Point 1
01 = Point 2
10 = Point 3
11 = Point 4
Rev. 2.4 (3/05)