B800-00-880 Issue A
Page 6
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Introduction
configured to provide an RS485 compliant or RS232 compatible interface by setting the position of the slide switch
(see
)
The Serial Enable signal MUST be linked to 0 V for the system to accept commands from the serial link. This is a safety
feature and acts as an interlock. For pure serial control the parallel start signal will be left unconnected.
The controller will still provide the Normal and Analogue signals on the logic interface connector even when operating
under serial control. The status of the Normal signal and the value of the system parameter on the analogue output
can also be obtained by interrogating the system status via the Serial link.
For more information about the Serial interface, refer to
.
1.5.3
Serial control with parallel monitoring
Since Normal and Analogue signals remain available even using Serial control, it is possible to control the pump via
the Serial link whilst monitoring these signals in the parallel interface.
The serial link uses the same connector pins as the parallel signals Standby and Fail respectively so these parallel
control and monitoring signals are not available. The Serial Enable signal MUST be linked to 0 V and the parallel start
signal will be left unconnected.
1.5.4
Parallel control with serial monitoring or serial configuration
This method of control is best for users who normally wish to operate the pump in parallel mode but occasionally
want to adjust the configuration settings stored in the Controller or to monitor operational status of the pump via
the serial link.
Whilst operating under parallel control with the serial link active, the start control signal is available (as described
in
.) but the standby control line is not since it is used as a serial data line.
The Serial Enable signal must be linked to 0 V for serial communications to take place. We suggest that you make a
special cable for serial communications that includes a link between Serial Enable and 0 V. This way, Serial Enable
is automatically activated when the cable is connected and then deactivated when the cable is removed.
1.5.5
Controller configuration (serial set-up)
All the configuration settings stored within the Controller are retained even when power to the nEXT pump is
removed. This means that it is possible to use a separate system to configure the Controller before fitting the nEXT
pump to your application. This gives the benefit of tailoring the pump functionality to a customer application and
allows the pump to be operated using a simple parallel interface system.
To configure the nEXT pump, either use your own simple serial system or use the Edwards TIC Turbo Controller or
Turbo Instrument Controller. The TICs have a feature which allows storage of a nEXT pump’s configuration. The
configuration can then be downloaded to another nEXT pump. This is useful when configuring a number of nEXT
pumps with the same settings before they are fitted to a system.
Note:
The RS485/RS232 slide switch must be in the (default) RS232 position if the TIC is to be used to configure
the nEXT pump. Refer to
The TIC is supplied with a Windows
TM
based PC program which allows the nEXT pump to be configured from a single
PC. The program has a simple user interface which means that it is not necessary to use the ASCII message protocol
described in
. The TIC PC Program has a facility to save multiple nEXT pump configurations which can then
be downloaded into other nEXT pumps.
Содержание nEXT240
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