Watson-Marlow 323Du - Manual (Page 26)

Watson-Marlow 323E, 323S, 323U and 323Du User Manual 26
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. Con-
nect the potentiometer as shown. Set the pump to ana-
logue control. Do not apply another voltage or current
control signal while using a remote potentiometer.
MemoDose
A Watson-Marlow remote control footswitch or
handswitch may be used to start the dose. The dose will
proceed once the switch is pressed. In an emergency
press the STOP key to stop the dose. The switch should
be connected as shown. Or a TTL compatible logic sig-
nal may be applied to pin 8. (Low 0V High 5V maxi-
mum. Ground to pin 9).
9
8
17.2 RS232 serial link
The RS232 interface will give basic pump control by serial link to the 9-way D con-
nector at the rear of the pump.
To select RS232 serial control, repeat MODE key press until “dig” is showing in the
display. Any analogue signals, or remote control inputs, applied to the 25-way D con-
nector 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.
Du
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 dam-
age, not covered by warranty, may result.
Connections for
RS232 signals
(viewed from in-
side the pump in-
terface plug)
Reserved
Shell Shell Shell Shell
Use only twin shielded RS232
cables for interconnections.
Network cable, RS232:
product code: 059.3121.000