Circutor QNA-P Series Instrukcja Użytkownika Pobierz pdf (Strona 32)

Page no. 31

B. Appendix: Communications with QNA-412 (RS485).

The QNA-412 has the option for RS-485 communication with a PC. This

connection is via the R2 port on the QNA.

This type of communication is done when the equipment is at a considerable

distance (maximum 1200m) from the computer from which readings are to be made.

To connect in this way, the cables that must be used are:

• PC.  RS-232 / RS-485 Converter

RS-232

P.C. (DB9) P.C. (DB25) RS-232/485 (DB9) Converter

3–Tx 2–Tx 2–Rx

2–Rx 3–Rx 3–TX

7–RTS

8–CTS

5–GND 5–GND 5–GND

• QNA-412  RS-232 / RS-485 Converter

RS-485

QNA-412

QNA-412 RS-232/485 (DB9) Converter

2–Tx/Rx(-) 2–Tx/Rx (-)

3–Tx/Rx(+) 1–Tx/Rx (+)

6–GND 5–GND

Front view

1 6

Ensure that the RS-232 cable is not connected to the PC. This is a priority port for

the RS-485.

This connection will prevent the QNA from communicating via the RS-485 port.

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Circutor QNA-P Series Instrukcja Użytkownika Strona 32