Edwards nEXT400 - Serial Enable; Figure 15 Logic Interface Connections - RS232 Serial Control; Figure 16 Logic Interface Connections - RS485 Serial Control

RS232 interface. When the RS485
opon is selected, it is easy to connect number of
pumps to a single master. Refer to Figure: RS485 mul‐drop connecon.
Figure 15 Logic interface connecons - RS232 serial control
1. RS232 interface on control equipment 2. 24 ‑ 48 V d.c. electrical supply
3. F
use 4. nEXT pump logic interface
1. RS232 interface on control equipment 2. 24 ‑ 48 V d.c. electrical supply
3. Fuse 4. nEXT pump logic interface
Figure 16 Logic interface connecons - RS485 serial control
1. RS485 interface on control equipment 2. 24 ‑ 48 V d.c. electrical supply
3. F
use 4. nEXT pump logic interface
1. RS485 interface on control equipment 2. 24 ‑ 48 V d.c. electrical supply
3. Fuse 4. nEXT pump logic interface
4.7.2 Serial enable
To send a serial message over the serial link, acvate the serial enable. To acvate the
serial enable, link the serial enable input signal (pin 5) to pin 2 of the customer logic
interface mang half.
We recommend you to incorporate this link into the serial communicaons cable so that
the serial enable is acvated only when the serial cable is connected. When the cable is
removed, serial enable will become inacve.
Serial enable operates as an interlock for the start commands sent over the serial
interface. If the pump operates in serial control mode (having been sent a serial start
command) and the serial enable becomes inacve, the pump will trigger a fail condion
04/2022 - ©Edwards Limited
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B80000880_G - Inst
allaon