Output Pin Assignments At The Pump - Watson-Marlow qdos20 User Manual

Remote stop
Depending on the polarity set in the control settings menu, applying a 5V to 24V signal to
pin 1 will STOP the pump in all operating modes. In manual and analogue mode, the pump
will start when the signal is removed. The user can reconfigure this input in the control
settings menu so that the pump will run when the signal is applied and stop when there is
no signal to pin 1.
The MAX key will work in manual mode regardless of the remote STOP input. This enables
priming without having to change pump settings or disconnect the input cable.
External contact—Universal and Universal+ models only
Digital pulse input min. 5V, min. pulse duration 40ms maximum duration 1000ms. This
input is used to trigger a user defined dose size. Refer to the contact mode section.
Speed: analog input
The speed of this pump can be controlled remotely by a current analog signal within the
range 4-20mA.
The analog signal must be applied to pin three of the M12 input connector. The pump will
provide an increasing speed for a rising control signal.
The Universal+ model can be calibrated by the user to control the speed proportionally or
inversely proportional to the input mA signal.
4-20mA circuit impedance: 250Ω.
Do not invert the polarity of the terminals. If the polarity is inverted
the motor will not run.
Remote fluid recovery
The user can reverse the pump remotely by supplying a signal to pin five.
10.3

Output pin assignments at the pump

Pin
Function
No.
Run status
1
output
Alarm
2
output
m-qdos-en-02
Open collector output uncommitted
Open collector output uncommitted
Pin 2
Pin 3
Pin 5
Pin 4
Specification
Pin 1
Output
colour
Brown
White
lead
27