Welch Allyn Duet CO2 Module - User Manual - Manual (Page 40)

Duet CO
2
Module OEM Implementation Manual
Page 40 Confidential Welch Allyn OEM Technologies
Software Protocol
Packets
§ Module must respond within 1 second after receiving a host command (50 msec typical response
time).
§ There is no minimum time interval between packets.
§ Host must request module status periodically to confirm the fault/ OK status of the module and
sensor.
§ Host must either receive a module response or have exceeded the module response timeout of 1
second before issuing a new command.
§ There are no restrictions when switching from mode to mode.
§ Packet that interrupts another packet causes the interrupted packet to be ignored.
§ An incomplete or incorrectly formatted packet is ignored.
§ Status messages have identical meanings in all operating modes.
Sensors
§ Only one sensor may be active at a time in warm standby, measurement and auto run modes.
§ If a new warm standby, measurement or auto run mode command is sent by the host while the
other sensor is currently in one of these modes, the module issues a standby mode command to
the other sensor.
§ During mainstream sensor warm up, the host can request status (<S0310> status response) and
temperature (<C23> host command).
Faults
§ The host should not assume that the module has a non-fault status if the module is sending
waveform and breath data. Data response packets may be communicated when the module is in a
non-fatal fault, or advisory, condition.
§ If a fault occurs while communicating to the mainstream or sidestream daughter board and the host
commands the module to access the other daughter board, the fault in the initial daughter board is
cleared.
§ If a fault occurs and the host issues a new mode command that is different than the current mode,
the module responds with either a hard fault status and ignores the mode command, or retries by
attempting to clear the fault.
§ If the module is in a soft fault state, the host issues a new measurement mode command to
attempt to clear the fault.
§ A fault condition may leave the module in the fault mode indicated by a <Sz5yy> status response.
For <Sz5yy> yy is the status message and z is the other status.