Page 3
1 Description
1.1 General
The Q-Daq is a self-contained pressure scanner that acquires and transmits pressure data to a host
via Ethernet or a CAN bus. The Q-Daq is mechanically based on the Chell SQDC range giving the
user the ability to connect it to an existing SQDC loom or, with the appropriate mating half, connect
the Q-Daq to flexible or solid tubing.
The Q-Daq range consists of two of models which are covered by this manual. These are the Q-Daq
PoE with is powered by Power over Ethernet (PoE) and features an M12 connector. This variant of
the Q-Daq does not have the facility for CAN communications or hardware trigger. The DC powered
version (D-Daq DC) does have the CAN and hardware trigger facility and is powered by a DC voltage
of 8 to 25 VDC.
Both devices have the ability to output absolute pressures or differential pressures. When differential
pressures are required, one of the 16 transducers is selected as the reference and subtracted from
the other 15 measurements.
Both Q-Daq models have a built-in heater which can be controlled via the web interface. The heater
is capable of maintaining a temperature of around 30°C above ambient and it can be set to control
any given temperature from -55°C to 70°C.
The Q-Daq is configured by using its embedded web-server. The output can be configured in a
number of ways including averaging, transmission speed, absolute or differential and also the ability
to add a time stamp to the data (compliant with IEEE1588 PTP v2).
This manual revision covers firmware version 1.0.0 PoE.
