Edwards nEXT nEXT85 - Connection for Mixed Parallel and Serial Operation; Figure 19 RS485 Multi-Drop Connection

Figure 19 RS485 mul-drop connecon
1. RS485 interface on control equipment 2. nEXT pump logic interface1. RS485 interface on control equipment 2. nEXT pump logic interface
4.7 Connecon for mixed parallel and serial operaon
You can use the parallel interface control inputs to control the pump. At the same me
you can use the serial interface or the USB service port (using the manufacturer's nST PC
soware) to monitor dierent pump parameters.
Alternavely, you can use the commands sent over the serial interface to control the
pump. At the same me, you can monitor the normal signal and analogue output over
the parallel interface.
Refer to Figure: Logic interface connecon - mixed parallel and serial operaon on page
55 for the schemac diagram of a system that demonstrates how to do this. The
connecon is a combinaon of the parallel and serial connecon, given in Connect the
parallel control and monitoring on page 43 and Connecon for serial control and
monitoring on page 45. Opons given in the secons are available in a mixed parallel
and serial operaon.
Note:
While serial enable is acve to enable the serial link, the parallel standby and fail signals
are not available.
The mul‑drop connecon is shown in Figure: Logic interface connecon - mixed parallel
and serial operaon on page 55. You can use the mul‑drop connecon with mixed
parallel and serial operaon.
You cannot use the parallel interfaces and serial interfaces at the same me to control
the pump. For example, if you start the pump by sending a start command over the
serial interface, you cannot stop the pump by using the start or stop switch on the
parallel interface. To stop the pump, send a serial stop command. Only when the serial
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B8G000880_D - Installaon