Technical data

35
W&T
Serial Fiber Optic Interfaces
Subject to error and alteration
Common properties
Function
All W&T Fiber Optic Interfaces convert the data lines of serial
ports (RS232, RS485, RS422, Profibus, 20mA) into a port for
glass fiber optic cable. In addition, Interface #81211 provides a
conversion for RS232 that supports not only the data lines but
also two hardware handshake lines.
Well-known ST connectors are used for connecting the glass
fiber optic cable, whereas the serial interface is configured as a
9-pin SUB-D connector.
The light used for data transmission has a wavelength of 820
nm. Commonly available Multimode duplex glass fiber optic
cable in 50/125 µm or 62.5/125 µm is used as the transmis-
sion medium, which due to its wide application in networking
is easily available and cost-effective. This means that even
already existing glass fiber optic lines intended for use in
networks can easily be used for transmitting serial data.
Depending on the attenuation of the glass fiber optic cable
used, data can be transmitted over a distance of maximum
3800 meters.
Supply voltage
The supply voltage for the Interfaces is provided through an
integrated switching regulator. This regulator has a variable
input voltage range and allows the Interface to be powered by
the supplied plug-in power supply or by any AC or DC voltage
between 12 and 24 volts.
The supply voltage is polarity reversal protected and can be
connected on the underside of the Interface either through the
built-in jack socket or the included plug-in screw terminal.