Serial Enable; Figure 23 Logic Interface Connections - Rs232 Serial Control; Figure 24 Logic Interface Connections - Rs485 Serial Control - Edwards nEXT730D Instruction Manual

Figure 23 Logic interface connections - RS232 serial control

1. RS232 interface on control equipment 1. RS232 interface on control equipment
3. Fuse 3. Fuse
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 24 Logic interface connections - RS485 serial control

1. RS485 interface on control equipment 1. RS485 interface on control equipment
3. Fuse 3. Fuse

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
and will decelerate to rest. To clear this fail condition, re-activate the serial enable and
send a serial stop command.
B8J200880_D
300812671_002_C3
B8J200880_D - Installation
2. Optional 24 V d.c. electrical supply 2. Optional 24 V d.c. electrical supply
4. nEXT pump logic interface 4. nEXT pump logic interface
2. Optional 24 V d.c. electrical supply 2. Optional 24 V d.c. electrical supply
4. nEXT pump logic interface 4. nEXT pump logic interface
Page 61 08/2021 - ©Edwards Limited