Vaisala WMS302 Guía de usuario descargar pdf (Pagina 34)

User's Guide ______________________________________________________________________

32 ___________________________________________________________________M210630EN-B

Introduction to DSI486

0403-108

Figure 16 Dual-Isolated Communication Module DSI486

DSI486 is a dual-isolated communication module, which can be used in

the RS-232, RS-485, or SDI-12 mode. The communication mode is

selected by the correct wiring of the I/O pins and with the correct

jumper settings on the board. The DSI486 module is used, for example,

for connecting displays, terminals, and the data logger together when

the distance is longer than 15 meters. The maximum distance for

DSI486 is approximately 1500 meters at full speed. The DSI486

module must be configured before using it in order to work as desired.

The RS-485/422 channels A and B are galvanically isolated from the

host board's electronics. The +5 VDC power supplies of channels A and

B are also isolated from each other with capacitors. Thus, it is possible

to wire these two channels to separate locations.

The RS-232 mode utilizes channel B. When channel B is used in the

RS-232 mode, it is possible to use channel A as a galvanically isolated

two-wire RS-485 channel. The RS-232 channel is galvanically

connected to the host board's GND potential.

The SDI-12 channel has its own connecting point on the board. It does

not use channel A or B for the communication. SDI-12 is galvanically

connected to the host board's GND potential.

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Vaisala WMS302 Guía de usuario Pagina 34