Honeywell VC4 User Manual page 155

Flag - 1 byte
bits 0-4: Reset selection
0x01 = Point 1 alarms
0x02 = Point 2 alarms
0x04 = Point 3 alarms
0x08 = Point 4 alarms
0x10 = Faults
Response packet from instrument:
Command Code (0x51) - 1 byte
VC4™ Date - 2 bytes
VC4™ Time - 2 bytes
Status - 1 byte
0x00 = Alarms reset
0xff = Error
Set Key-Code - 0x52
This command allows you to reconfigure the keypad lock-out and key code. The keypad can be
disabled, preventing unauthorized user intervention by enabling the keypad lockout (bit 0). This
configures the keypad and a new key code.
The old key code must match the code currently programmed into the VC4™ monitor for this
command to succeed in changing the code.
Command packet to instrument:
Command Code (0x51) - 1 byte
Keypad Status - 1 byte
bit 0: Keypad lock-out function
0 = Disable
1 = Enable
bits 1-7: Undefined
Old Key code - 2 bytes (valid 0000 - 9999)
New Key code - 2 bytes (valid 0000-9999)
Response packet from instrument:
Command Code (0x51) - 1 byte
VC4™ Date - 2 bytes
VC4™ Time - 2 bytes
VC4™ 155 User Manual