Vaisala HydroMet Guide de l'utilisateur télécharger pdf (Page 31)

Chapter 2 __________________________________________________________ Product Overview

VAISALA_______________________________________________________________________ 29

The RS-485 isolated communication module provides a 2-wire or 4-

wire RS-485-communication link between two devices with a similar

interface. This module is used, for example, for connecting displays and

terminals to the data logger when the distance is longer than 15 meters.

The maximum distance for the isolated RS-485 module is

approximately 1500 meters at full speed. The module must be

configured before use.

Dual-Isolated RS-485 Communication Module

0906-070

Figure 10 Dual-Isolated RS-485 Communication Module

DSI486

The RS-485 dual communication module is dual-isolated and 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 dual RS-485 communication

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 is approximately 1500 meters at full speed. The

module must be configured before use.

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.

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Vaisala HydroMet Guide de l'utilisateur Page 31