Edwards nRVi, Инструкция по эксплуатации

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4.10 Connection for serial control and monitoring
The serial interface allows the pump to be controlled and to be interrogated as to its
operational status using a number of serial commands. There is also a multi-drop mode
that allows for the connection of more than one pump to a single serial port on the
control system.
The pump can connect directly to the RS485 or RS232 serial input on customer control
equipment or a PC as shown in Figure: Logic interface connections - RS232 serial control
on page 44 and Figure: Logic interface connections - RS485 serial control on page 44 . In
this configuration the PC is the serial link master and the pump is the slave. The RS232
serial link can operate reliably at distances up to 6 m. The RS485 serial link is
recommended to maintain reliable serial communications at distances greater than 6 m.
Alternatively an interface circuit, external to the pump, may be required to communicate
using the RS232 serial link over longer distances.
The software in the pump is can operate with several pumps connected to a single serial
link master. This is referred to as multi-drop mode (refer to Operation with multi-drop on
page 58 ). The RS485 option is recommended for multi-drop mode.
4.10.1 Connect the serial interface to the customer control equipment
To enable the RS485 option, link the RS485 input signal to the 0 V control reference (pin
6 to pin 2) of the logic interface mating half.
Figure 11 Logic interface connections - RS232 serial control
1. RS232 interface on control equipment or 2. nRVi pump logic interface PC 1. RS232 interface on control equipment or 2. nRVi pump logic interface PC
Figure 12 Logic interface connections - RS485 serial control
1. RS485 interface on control equipment or 2. nRVi pump logic interface PC 1. RS485 interface on control equipment or 2. nRVi pump logic interface PC
Page 44
A65901880_D - Installation