Honeywell VC4 User Manual page 166

Set Duty Cycle - 0x65
This command allows a master to set the minimum window time and the monitor relay
response bits on a slave. Please see packet 0x69, GetDutyCycle for a discussion of these
parameters.
Command packet to slave:
Command code (0x65) - 1 byte
Bits permitting monitor relay action during duty cycle - 1 byte
bit 0 point1
bit 1 point2
bit 2 point3
bit 3 point4
bits 4-7 unused (ignored by slave)
Minimum window time (seconds) - 2 bytes
Response from slave:
Command code (0x65) - byte
VC4™ date 2 bytes
VC4™ time 2 bytes
Status - 1 byte
0x00 packet accepted
0x01 time >900 seconds, unacceptable
0x02 time < 0 seconds, unacceptable
0xFF slave in monitor, unable to accept changes
Set Filter - 0x66
This command allows a master to set the lifetime of a filter. See packet 44 for a discussion of
these parameters. The valid range of lifetimes is 30 to 365 days. The system maintains the
number of days remaining as a constant if the lifetime changes.
Command packet to instrument:
Command code (0x66) - 1 byte
Internal filter lifetime (days) - 2 bytes
External filter lifetimes (days) - 2 bytes
Response from instrument:
Command code (0x66) - 1 byte
VC4™ date - 2 bytes
VC4™ time - 2 bytes
VC4™ 166 User Manual