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Product Description
The Model 227
RS-232 High Speed Line Driver with LCD Display
provides full duplex transmission from DC to 115.2 KBPS over two
twisted pairs. The Model 227 includes Telebyte's unique DataSpy LCD
display, which provides the user with important status information
regarding the operation of the device. This LCD operates from less
than one milli-watt of power thereby not affecting the operation of
the Model 227. The LCD is extremely useful during the installation
and checkout and whenever there are suspected problems. The graphic
display presents the user with live status of the transmit and
receive data signals, TD and RD, and control signals, CTS, RTS, DSR,
DCD and DTR. The Model 227 does not require any power source since
it steals its power from the Transmit Data signal applied to the
RS-232 connector. The data I/O occurs on Pins 2 and 3 of the RS-232
connector. The DTE/DCE switch allows reversing of the connections to
Pins 2 and 3 depending on whether the unit to which the modem is
connected is wired as a DTE or DCE device. Data transmission between
modems utilizes differential baseband signaling techniques. Common
mode signal rejection capability is greater than 20 volts. These
features provide for error free operation in noisy environments. The
Model 227 is offered with a female RS-232 connector. The
four wire line interface is a five-position terminal block and an
RJ-11 modular phone connector. The four-wire line includes built-in
surge protection which uses pin 1, Frame Ground, as the path for
suppressing surges.
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