Watson-Marlow 620DuN and 620Du User Manual 68
Note: The CTS connection to pin 8 is optional, for use when error conditions are
required.
23.1 Speed: analogue input 1
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.
The analogue process signal must be applied to pin 4 of the lower D-connector. 0V
to pin 16. 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 signal (invert-
ed response). See 18.2 Analogue in the Setup menu.
Pin Function Pin Function
1 - 6 -
2 RX (receive data) 7 -
3 TX (transmit data) 8
CTS (clear to send.
Active = low)
4 - 9 -
5 0V Shell
RS232 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.
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