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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 2 Handshake None
Data bits 8 Auto 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.