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Connection for serial control and monitoring
A735-01-860 Issue A
3.8 Mixed parallel and serial operation
You can control the nXDS pump using the parallel interface control inputs and at the same time monitor various pump
parameters using the serial interface. Alternatively you can control the nXDS pump using commands sent over the
serial interface and at the same time monitor the normal signal using the parallel interface. Figure 6 shows a
schematic diagram of an example mixed operation system that would allow you to do this. Many of the individual
functions available in either parallel or serial operations are also available in mixed parallel and serial operation; but
note that whilst serial enable is active, the parallel standby and fail signals are not available.
The following functions can also be used in conjunction with mixed parallel and serial operation:
Multi-drop operation; described in Section 3.7.
Analogue speed control; described in the nXDS Scroll Pump Instruction Manual (A735-01-880)
For more information on the parallel control and monitoring, please refer to the nXDS Scroll Pump Instruction Manual
(A735-01-880).
Figure 6 - Logic interface connection - mixed parallel and serial operation
You cannot control the nXDS pump using both the parallel and serial interfaces simultaneously. For example, if you
start the pump by sending a start command over the serial interface, you cannot then stop the pump by using the
parallel interface; you must stop the pump by sending a stop command over the serial interface. Similarly, if you
start the pump by using the start / stop switch on the parallel interface, you cannot then stop the pump by using the
serial interface; you must stop the pump by using the start / stop switch on the parallel interface.
1. RS232 interface on control equipment or PC
2. nXDS pump logic interface
3. Start / Stop switch
4. Optional LED indicator - normal speed
5. Current limit resistor for LED
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