Edwards nEXT 55, Instruction Manual, Page: 51 / 116

Figure 22 Logic interface connections - RS232 serial control
1. RS232 interface on control equipment 2. 24
‑
48 V d.c. electrical 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 23 Logic interface connections - RS485 serial control
1. RS485 interface on control equipment 2. 24
‑
48 V d.c. electrical 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
4.6.2 Serial enable
To send a serial message over the serial link, activate the serial enable. To activate the
serial enable, link the serial enable input signal (pin 5) to pin 2 of the customer logic
interface mating half.
We recommend you to incorporate this link into the serial communications cable so that
the serial enable is activated only when the serial cable is connected. When the cable is
removed, serial enable will become inactive.
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 inactive, the pump will trigger a fail condition
and will decelerate and stops. To clear the fail condition, activate the serial enable again
and send a serial stop command.
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B8G000880_E - Installation