5.7 Connecon for mix
ed parallel and serial operaon
The pump can be controlled using parallel interface control inputs, and at the same me
monitor various pump parameters using the serial interface or the USB service port
using the Edwards nST2 PC soware. Alternavely, the pump can be controlled using
commands sent over the serial interface while at the same me monitoring the normal
signal and analogue output over the parallel interface.
Figure: Logic interface connecon - mixed parallel and serial operaon shows a
schemac diagram of a system that demonstrates how to do this. This connecon is a
hybrid of the parallel and serial connecon which are described in detail in Connect the
parallel control and monitoring on page 58 and Connecon for serial control and
monitoring on page 59 respecvely. Many of the opons described in those secons are
available in mixed parallel and serial operaon but note that whilst serial enable is acve
to enable the serial link, the parallel standby and fail signals are not available. The mul-
drop connecon shown in Figure: Logic interface connecon - mixed parallel and serial
operaon can also be used with mixed parallel and serial operaon.
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.
08/2021 - ©Edwards Limited
Page 62B8J200880_D
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