The motor 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 Connection for serial control
and monitoring on page 73.
3.4.4 Serial control with parallel monitoring
Normal and analogue signals remain available when 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 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.
3.4.5 Parallel control with serial monitoring or serial configuration
Use this configuration to operate the pump in parallel control mode, with the option to
adjust the configuration settings stored in the motor controller or to monitor operational
status of the pump through the serial link or via the USB service port.
If using the USB service port in conjunction with Edwards nST2 PC software, the serial
enable signal does not need to be linked to 0 V for the serial communications to take
place. Whilst operating under parallel control with the USB service port, all of the
parallel control and monitoring signals are available (as described in Parallel control and
monitoring on page 20), including the standby control line and fail monitoring line.
If using the serial link, the serial enable signal must be linked to 0 V for serial
communications to take place. Whilst operating under parallel control with the serial link
active, the parallel start control signal is available (as described in Parallel control and
monitoring on page 20) but the standby control line is not since it is used as a serial data
line.
If the serial enable line is deactivated at any time whilst the RS485/CAN/RS232 slide
switch is in the RS232 position, the serial link should also be disconnected. 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.
3.4.6 CAN interface
Contact Edwards for more detail on the CAN interface.
The CAN LED illuminates green when the CAN communication is good and active, and
red to indicate an error preventing CAN communication.
3.4.7 Motor controller configuration (serial configuration)
All the configuration settings stored within the motor controller are retained when
power to the pump is removed, so that it is possible to use a separate system to
configure the motor controller before fitting the pump to the application.
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