Figure 37 Logic interface connections - RS232 serial control
1. RS232 interface on control
equipment
2. Optional 24 V d.c. electrical supply
3. Fuse 4. nEXT pump logic interface
Electrical supply connection to pins 1, 6 and 11 is not required for the nEXT pump as it
has a dedicated pump power supply cable. The fuse is only required if a 48 V d.c.
electrical supply is connected to the logic interface cable.
Figure 38 Logic interface connections - RS485 serial control
1. RS485 interface on control
equipment
2. Optional 24 V d.c. electrical supply
3. Fuse 4. nEXT pump logic interface
5.6.2 Serial enable
To send a serial message over the serial link, serial enable must first be activated.
Link the serial enable input signal (pin 5) to pin 2 of the customer logic interface mating
half.
Edwards recommends incorporating this link into the serial communications cable so
that the serial enable is only activated when the serial cable is connected. When the
cable is removed, serial enable will become inactive.
Serial enable acts as an interlock for start commands sent over the serial interface. If the
pump is running in serial control mode (having been sent a serial start command) and
the serial enable subsequently becomes inactive, the pump will trigger a fail condition
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