Honeywell VC4 User Manual page 161

Status - 1 byte
0x00 = Value saved and verified
0x02 = Minutes Invalid
0xff = Not saved
Set Display Time - 0x5B
This command configures the length in seconds Cycle that the concentration for each point is
displayed while in the Monitor mode.
Command packet to instrument:
Command Code (0x5B) - 1 byte
Cycle time - 1 byte (valid 2-10 sec)
Response packet from instrument:
Command Code (0x5B) - 1 byte
VC4™ Date - 2 bytes
VC4™ Time - 2 bytes
Status - 1 byte
0x00 = Value saved and verified
0x01 = Value < 2 seconds
0x02 = Value > 10 seconds
0xff = Not saved
Set Idle Time - 0x5C
This command configures how long the unit can be left out of analysis before setting an
Instrument fault. Idle time allows you to exit the Monitoring mode without causing an
Instrument fault (if the idle time is > 0). You simply set the idle time to an appropriate idle (non-
monitoring) time. If the idle time has expired and the unit is not in the Monitoring mode, an
instrument fault will be issued. An idle time setting of 0 disables this option.
Command packet to instrument:
Command Code (0x5C) - 1 byte
Idle Time - 1 byte (0 disabled, 1-45 mins)
Response packet from instrument:
Command Code (0x5C) - 1 byte
VC4™ Date - 2 bytes
VC4™ Time - 2 bytes
VC4™ 161 User Manual