Welch Allyn Duet CO2 Module - User Manual - Manual (Page 42)

Duet CO
2
Module OEM Implementation Manual
Page 42 Confidential Welch Allyn OEM Technologies
could leave the module in Fault mode () or the module could remain in Measurement or
Autorun mode (e.g., if a Very Low Signal - Warning status message is returned).
Measurement Mode Start-up Sequence
The Host can command the module to go into Measurement or Autorun mode provided no fault
conditions exist. The following is the sequence the module automatically performs for the Mainstream
sensor when entering Measurement mode (the sequence for Autorun mode is the same).
Task Elapsed time (typical) Status Response Message
Warm sensor 45 to 90 sec. Not to temp
Start sensor motor 5 to 10 sec. Starting Sensor
Turn on IR source,
wait for signal
10 sec. Starting Sensor
“No Water trap” Status Messages
During ‘Measurement’ and ‘Autorun’ modes, the Duet Module will continually verify that a Water trap is
present. If the Water trap is NOT detected and a status request is received, the status message “No
Water trap” will be returned. No waveform data will be sent at this time. Regardless of the operating
mode, this status message will be returned until a Water trap is inserted, the host sends a mode
change command, or a fault event is detected.
If the Duet Module was in ‘Measurement’ mode and the Water trap was not detected for 30 seconds,
the Module will switch to ‘Standby’ mode. As before, the Duet will return the “No Water trap” status
message (i.e., ) in response to any status request. Even in “Standby” mode, this status
message can only be eliminated if a Water trap is inserted, the host sends a mode change command,
or a fault event is detected.
In ‘Autorun” mode, removing the Water trap does not change the mode to ‘Standby’. Instead, the Duet
Module will remain in Autorun’. When it is desirable that the host not be required to reinitiate CO
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activity when a Water trap is replaced. ‘Autorun’ mode should be used.
If the Duet Module enters the ‘Standby’ mode via a mode change command or initialization, it will NOT
examine if the Water trap is present. Consequently, the “No Water trap” status message will NOT be
returned during this time.