Vaisala GMP343 User Manual download pdf (Page 39)

Chapter 4 ________________________________________________________________ Operation

VAISALA_______________________________________________________________________ 37

Networking Operation

When several transmitters are connected to the same RS-485 bus it is

recommended to use separate power supplies for each transmitter. Make

sure that the devices are grounded to the same potential. Otherwise harmful

ground currents may be generated or RS-485 common-mode limits may be

exceeded.

There is no internal termination for the RS-485 bus on the GMP343. For

long RS-485 bus lengths proper termination should be provided externally.

Setting the Transmitter Address

ADDR aa <cr>

SAVE <cr>

aa=address (0...99)

Example (changing address from 0 to 1):

>addr

ADDR : 0 ? 1

>save

EEPROM saved successfully.

NOTE

Only approximately 1 % accuracy is obtained with the software clock.

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Vaisala GMP343 User Manual Page 39