Lock Keyboard - 0X53 - Honeywell CM4 Technical Handbook

CM4 Four-Point Continuous Monitor

Lock Keyboard - 0x53

This command allows you to lock out the keyboard. The keyboard can
be disabled, preventing unauthorized user intervention by enabling the
keypad lock out and sending a valid key code.
This allows only persons with the key code to operate the keypad.
Command packet to instrument:
Command Code (0x53) - 1 byte
Keypad Status -1 byte
bit 0: Lock or unlock keypad
0 = Unlocked
1 = Locked
bits 1-7: Undefined
Key code - 2 bytes (valid 0000 - 9999)
Response packet from instrument:
Command Code (0x53) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes
Status -1 byte
0x00 = Saved and verified
0x01 = Key code invalid
0xff = Error, not saved
CM4 Technical Manual
Set 2mA Fault Operation - 0x54
This command configures the unit for an output option of 2 milliamperes
rather than the default 4 milliamperes.
Command packet to instrument:
Command Code (0x54) - 1 byte
Enable/Disable - 1 byte
0 = Featured disabled
1 = Feature enabled
Response packet from instrument:
Command Code (0x54) - 1 byte
CM4 Date - 2 bytes
CM4 Time -2 bytes
Status - 1 byte
0x00 = Feature programmed
0xff = Error occurred
Start New Cycle - 0x55
This command allows you to toggle the unit into and out of the Monitor
mode.
Command packet to instrument:
Command Code (0x55) - 1 byte
State - 1 byte
bit 0: Take/put into analysis
0 = Take out of Monitor mode
1 = Put in Monitor or pull window
bits 1-7: Undefined
Response packet from instrument:
Command Code (0x55) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes
Status - 1 byte
0x00 = Request Executed
0xff = Error
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