Watson-Marlow 620DuN and 620Du User Manual 59
22.3 Speed: analogue input
It is possible to control the speed of the pump remotely by
one of these methods: a voltage analogue signal within the
ranges 0-10V or 1-5V; or a current analogue signal within
the range 4-20mA; or a remote potentiometer using the 10V
supply at J7.
The analogue process signal must be applied to the i/p ter-
minal of the Analogue 1 connector (J5). Ground to the 0V
terminal of the same connector. The pump will provide an
increasing flow rate for a rising control signal (non-inverted
response) or an increasing flow rate for a falling control sig-
nal (inverted response). See 18.2 Analogue.
RS485 settings
Baud Set in Setup, Baud.
Factory default is 9600 Parity None
Stop bits 2Handshake None
Data bits 8Auto echo On
Never apply mains voltage to the D-connectors. Apply
the correct signals to the pins shown. Limit signals to
the maximum values shown. Do not apply voltage
across other pins. Permanent damage, not covered by
warranty, may result.