Vaisala WXT520 Manuel d'utilisateur télécharger pdf (Page 10)

CONNECTING 7470 FOR RS-232/485

CONFIGURATION

Using RS-232 or RS-485 for configuring the 7470 is necessary only if a programming

cable is not available.

Wiring

RS-232

Disconnect the Vaisala unit from the 7470.

Wire the Tx of 7470 to Rx of your PC, and

vice versa. Also connect the common.

For a D9 RS-232 connector, the wiring

goes:

7470 Name PC

4 Rx 3

5 Common 5

6 Tx 2

RS-485

Connect the terminal 1 (D1) of the 7470 to

the D1 or + terminal of your RS-485 port.

Connect the terminal 2 (D0) to the D0 or –

terminal of your RS-485 port. Also

connect the commons together, if

possible.

Jumper

The RS-232/485 port of the 7470 can be

configured for various protocols, but SCL

and Modbus RTU protocols allow

configuration with MekuWin software. To

ensure that the 7470 is using the SCL

protocol, 9600 baud, and address 0, close

the jumper JP1 inside the enclosure. The

7470 manual will give details on this.

When the configuration is done, remove

the jumper.

Configuring

Launch MekuWin. Select the appropriate

COM port, SCL protocol, 9600 baud, and

address 0 or 126. Try to connect.

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Vaisala WXT520 Manuel d'utilisateur Page 10