Connection For Mixed Parallel And Serial Operation - Edwards nEXT730D Instruction Manual

5.7 Connection for mixed parallel and serial operation

The pump can be controlled using parallel interface control inputs, and at the same time
monitor various pump parameters using the serial interface or the USB service port
using the Edwards nST2 PC software. Alternatively, the pump can be controlled using
commands sent over the serial interface while at the same time monitoring the normal
signal and analogue output over the parallel interface.
Figure: Logic interface connection - mixed parallel and serial operation
schematic diagram of a system that demonstrates how to do this. This connection is a
hybrid of the parallel and serial connection which are described in detail in
parallel control and monitoring
monitoring
available in mixed parallel and serial operation but note that whilst serial enable is active
to enable the serial link, the parallel standby and fail signals are not available. The multi-
drop connection shown in
operation
The pump cannot be controlled using both the parallel and serial interfaces
simultaneously. For example, if the pump is started by sending a start command over the
serial interface, the pump cannot then be stopped by using the start /stop switch on the
parallel interface. The pump will ignore the state of the start / stop switch on the parallel
interface. To stop the pump, send a serial stop command. Only when the serial stop
command has been received by the pump can any commands sent via the parallel
interface be acted on.
Similarly, if the pump is started using the start switch on the parallel interface, the pump
cannot then be stopped by sending a stop command over the serial interface. The pump
will ignore any start or stop commands received over the serial interface. To stop the
pump, use the parallel stop switch. Only when the pump has been stopped using the
parallel interface switch will any start or stop commands be accepted via the serial
interface.
B8J200880_D
300812671_002_C3
B8J200880_D - Installation
on page 58 and
on page 59 respectively. Many of the options described in those sections are
Figure: Logic interface connection - mixed parallel and serial
can also be used with mixed parallel and serial operation.
Page 62
shows a
Connection for serial control and
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Connect the