Vaisala WXT520 Manuel d'utilisateur télécharger pdf (Page 13)

WIRING

RS-485

Separate serial and power wiring

Combined wiring

Since Vaisala does not have an isolation between serial and power ports, one wire can

serve as a serial common and power supply minus wire.

If there are several 7470's, just connect them in parallel.

1

2

3

4

5

6

19

20

WXT520

1

2

3

4

5

6

7470

11

12

+

-

Power

Twisted pair

1

2

3

4

5

6

19

20

WXT520

1

2

3

4

5

6

7470

11

12

+

-

Power

Twisted pair

1 2 ... 8 9 10 11 12 13 14

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