B722-40-880 Issue F
Page 6 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
1.5.2 Full serial control
The serial communications link provides complete control and monitoring using just three signal lines. The Serial data
RX and TX use the same connector pins as the parallel signals Standby and Fail respectively.
The Serial Enable signal MUST be linked to 0 V for the system to accept commands in Serial control mode. This is a
safety feature and acts as an interlock. In addition, the parallel Start signal must be left unconnected for Serial
commands to be accepted in full Serial control mode.
The Podule will still provide the Normal and Analogue signals on the logic interface connector even when operating
in full Serial control mode. The status of the Normal signal can also be obtained by interrogating the system status
via the Serial interface.
For more information about the Serial interface, refer to Section 3.7.
1.5.3 Serial control with parallel monitoring
Since Normal and Analogue signals remain available even using Serial control mode, it is possible to control the pump
via the Serial interface whilst monitoring these signals using a parallel link.
Again, the Serial data RX and TX use 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 Start switch must remain open (no connection).
1.5.4 Parallel control with occasional serial monitoring or serial setup
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 Podule or to monitor operational status of the pump.
Whilst operating in Parallel mode, the same controls and monitoring signals are available as described in
Section 1.5.1. It must be remembered that the Serial data RX shares the same connector pin as the Standby signal so
the pump cannot be commanded into Standby speed using this line.
The Serial Enable signal must be linked to 0 V for serial communications to take place. Edwards suggests making 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 Podule configuration (serial setup)
All the configuration settings stored within the Podule are retained even when power to the DX pump is removed.
This means that it is possible to use a separate system to configure the Podule before fitting the DX pump to the
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 DX pump, either use a customer simple serial system or use the Edwards TIC Turbo Controller or
Turbo Instrument Controller. The TICs have a feature which allows storage of a DX pump’s configuration. The
configuration can then be downloaded to another DX pump. This is useful when configuring a number of DX pumps
with the same settings before they are fitted to a system.
The TIC is supplied with a Windows
TM
based PC program which allows the DX 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 Section 3.7. The TIC PC Program has a facility to save multiple DX pump configurations which can then
be downloaded into other DX pumps.
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