Vaisala HydroMet Service Manual download pdf (Page 49)

Chapter 5 ________________________________________________ Telemetry and Communication

VAISALA________________________________________________________________________ 47

CHAPTER 5

TELEMETRY AND COMMUNICATION

Telecommunication costs are frequently the major annual cost of

operating an observation network. Therefore, it is essential that there

are several alternative telecommunication options available to best

optimize this function. In addition, the availability of

telecommunications is frequently a restrictive factor.

In addition, the availability of data sets requirements for the

telecommunication equipment used in the network. When e.g. flood

warning is a critical requirement, then near real-time data transmission

must be guaranteed. In the MAWS systems there can be two or more

redundant communication devices connected at most critical sites,

where data availability is of the highest concern.

On the other hand, when data is used for statistical purposes or

processes which do not require real-time data, other, often less costly

methods, can be used. The MAWS system offers solutions for all

these requirements.

Serial I/O Lines

The MAWS system has one (1) RS-232 and one (1) RS-485 port as

standard. Two (2) optional plug-in communication modules can be

used for enhancing the number of serial I/O channels up to seven (7),

including SDI-12 serial sensor interface(s). The high number of serial

channels allows the interfacing of intelligent sensors. Redundant

communication channels can easily be used for applications and sites

where data accessibility is highly important.

The standard RS-232 interface is normally reserved for local use and

maintenance tasks such as command interface, updating software,

uploading new configurations or downloading logged data files. For

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Vaisala HydroMet Service Manual Page 49