Industrial modem goes to extremes
A
Westermo Data Communications product story
Edited by the Engineeringtalk editorial team
May 21, 2004
A new top-of-the-range industrial modem is designed for use in high noise and extreme temperature environments.
A new top-of-the-range industrial modem is designed for use in high noise and extreme temperature environments, includes all the very latest advanced features and is aimed at customer specific and difficult configuration applications.
The TD-34 is a V.34 analogue modem supporting line speeds of up to 33.6Kbit/s - the fastest analogue-to-analogue modulation possible.
With a terminal data speed of 115.2Kbit/s the modem can be used for high-datarate applications.
It can be used on a standard public switched telephone network (PSTN) or leased lines consisting of two or four wires for line connection.
Unlike traditional modems the TD-34 has two alarm contacts - both an input and output.
This optoisolated interface can be used to dial a preconfigured number based on an alarm input.
The input can also be pulsed and depending on the number of pulses received a number of different things can happen.
Up to 10 different functions can be programmed and more than one event can be triggered by a single input, these events include sending a text string, SMS or e-mail message.
It is also possible to make the modem perform basic I/O functions such as to send a simple switch function over the link to turn power on and off at a remote site.
The input at the remote site could also be linked to the output at the local site and provide an indication of the status at the remote site.
The TD-34 offers remote configuration and maintenance.
It has a special dial-back security function, which prevents unauthorised access and ensures that data is secure.
A "fallback" mode is supported when using leased lines.
This means that in the event of a line failure a PSTN connection is negotiated and then periodically the leased line is checked until connection can be re-established.
The TD-34 has as standard both RS232 and RS422/485 ports although only one can be used at any time.
There are two variants of the TD-34 for different power supplies, the LV (12-54V DC, 12-27V AC) and HV (95-240V AC 110-240V DC).
As with all Westermo industrial products the TD-34 has galvanic isolation, transient protection and 35mm DIN-rail housing making the modem suitable for true industrial applications.
The modem is suitable for use at extreme temperature ranges (-40 to +70C) and can be used to altitudes of 4000m.
With the difficult and complex configurations in mind for the TD-34 Westermo have also produced the TD-tool, an easy-to-use configuration tool for setting up the range of different alarm I/O available.
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