Edwards nEXT200200 - Serial Enable; Figure 12 Logic Interface Connections - RS232 Serial Control; Figure 13 Logic Interface Connections - RS485 Serial Control

number of pumps to a single master. Refer to Figure: R
S485 mul-drop connecon on
page 46.
Figure 12 Logic interface connecons - RS232 serial control
1. RS232 interface on control equipment 2. 24 ‑ 48 V d.c. electric
al supply
3. Fuse 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 13 Logic interface connecons - RS485 serial control
1. RS485 interface on control equipment 2. 24 ‑ 48 V d.c. electric
al supply
3. Fuse 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
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B85200880_D - Ins
tallaon