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Appendix C. Interfacing with HMP155A RS-485 Output

Connect the MD485’s CS I/O port to the datalogger’s CS I/O port using an

SC12 cable. Use the HMP155ACBL2 to connect the HMP155A sensor to the

MD485 and the datalogger (CR1000, CR800, or CR3000) as shown in the

following table. The table also shows wiring for cables purchased from

Vaisala.

HMP155A

CSI Cable

HMP155A

Vaisala

Cable

MD485

CR1000

Connector

Pin-Out

Blue Pink B 6

Yellow Brown A 2

Black Red G 8

Red Blue 12V 7

White Green Ground 3

Shield

(clear)

Black Ground Not

Connected

Grey, Pink,

Brown -

NOT used

C.3.2 CR1000 Example Program for use with MD485

The following program sends the commands ‘SMODE RUN’ and ‘R’ to enable

the RS-485 output. SerialInRecord and Mid instructions parse the serial string

and put the temperature and relative humidity values into public variables.

C-7

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Campbell HMP 35A Bedienerhandbuch Seite 39