10
323Du
400
220
Speed
A remote potentiometer may be connected to control the pump speed. Use a potentiometer of between 1K
and 10KOhms, with a minimum power of 0.25W. Connect the potentiometer as shown. Set the pump to
analogue control. Do not apply another voltage or current control signal while using a remote potentiometer.
RS232 serial link
RS232 serial link
RS232 serial link
RS232 serial link
RS232 serial link
The RS232 interface will give basic pump control by serial link to the 9-way D connector at the rear of the
pump. An interface kit is available from Watson-Marlow which includes Pumpnet 2, a DOS compatible
control program, and connection cable.
To select RS232 serial control, repeat
key press until “
dig
” is showing in the display. Any analogue signals,
or remote control inputs, applied to the 25-way D connector will be ignored.
The 323Du version of the serial interface provides a direct link to a single pump. The pump has no unique
address but the software requires a pump identification of 1.
Use only twin shielded RS232 cables for interconnections.
Never apply mains voltage to the 9-way D connector. Only RS232 signals may be applied
to pins 2,3,5 and 8. Do not apply voltage across other pins. Permanent damage, not
covered by warranty, may result.
Connections
for RS232
signals
(viewed from
inside the
pump
interface plug)
Standard Watson-Marlow
RS232 connection cables
