Vaisala DPT145 User's Guide download pdf (Page 28)

User's Guide _______________________________________________________________________

28 ___________________________________________________________________ M211371EN-D

Wiring

Standard Wiring

Connect supply voltage and RS-485 to port II. Port I does not need to be

used at all, and can remain covered.

1108-015

Figure 8 Wiring Non-Isolated RS-485

Wire Colors for Vaisala Cables

Connection on Port I

Connection on Port II

Wire Color

VDC supply+

Brown

RS-485 D0-

White

GND

Blue

RS-485 D1+

Black

Note the following:

- The ground pin (pin 3) on both ports is internally connected to each

other and to transmitter chassis. The chassis connection is through a

1 MΩ resistor and a 40 nF capacitor that are connected in parallel.

- The frames of the M8 connectors are not connected to the chassis.

15 ... 28 VDC

RS-485 +

RS-485 -

GND

SHIELD

1 3

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 62 63

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Vaisala DPT145 User's Guide Page 28