Product Description
Total isolation between RS-232 based systems and RS-422 is provided
by Telebyte's Model 265 optically isolated RS-232 to RS-422 converter.
Unique circuitry allows the RS-422 port to withstand surges exceeding
10 kilovolts. A switch is included to reverse Pins 2 and 3 of the
RS-232
connector to accommodate DTE or DCE ports. Data flow is displayed on
TD and RD LED indicators. The RS-232 input is a DB25 male connector.
The RS-422 interface is a five position terminal strip where one of
the terminals is an earth ground connection, used when the environment
can produce surges on the two twisted pairs of the RS-422 port. Since
the RS-422 circuitry is optically isolated a separate power supply
(a
wall mounted transformer) is included for the RS-422 port. The power
for the RS-232 interface is derived from TD or any one of the control
pins of the interface, 4 (RTS), 5 (CTS), 6 (DSR), 8 (DCD), or 20 (DTR).
Full duplex transmission is provided up to 19.2 KBPS over a distance
of 2 miles.
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