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Moxa CP114EL-I Serial line adapter
The Processor Unit is equipped with a Moxa CP114EL-I serial adapter board. The board
provides four serial lines. The serial lines are connected using a large D-Subminiature
connector on the rear side of the Processor Unit.
The Moxa CP114EL-I serial adapter supports RS-232,
RS-422 and RS-485 (both 2 and 4-wire). The
connections to the board are made using a converter
cable with four 9-pin male D-subminiature connectors.
The converter cable is supplied with the Processor Unit.
•
Manufacturer
: Moxa
•
Manufacturer’s website
:
Unless otherwise specified, this cable must be provided by the installation shipyard. If
you wish to use RS-422 or RS-485 serial communication, use a cable with twisted pairs.
Note
Observe that long runs of unshielded cable will pick up noise easily. This is because
the RS-232 signals are not balanced.
Maximum length for an RS-232 serial cable is typically 60 meters with 2400 bps data
rate, however this depends on the cable quality. Always check the cable manufacturers
specifications for the actual "shunt capacitance". A common figure is 47.5 pF/m, which
gives a maximum cable length of about 50 meters.
Even though a standard exist for RS-232 pin configuration, certain manufacturer may
still choose their own connector pins for the various signals used. In order to make the
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Страница 223: ...394149 D 221 6 Start the installation by selecting Next 7 Select Finish to close the wizard Setting to work ...
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