The LDM85 is a small, inexpensive
fiber optic transmitter/receiver. It
features a complete RS-232 port as
well as high speed TTL/RS-422/
RS-423 data transmit and receive.
It is capable of data rates from DC
to 5M baud. A pair of these units
allows most RS-232C cable links to
be replaced and extended with a
duplex fiber optic cable. The normal
50-foot RS-232 limit may be
extended to 1.2 miles (2 km).
Fiber optic data communications
provide complete EMI/RFI rejection,
isolation, elimination of ground
loops, and reduced error rates. Data
security is enhanced by almost nonexistent electromagnetic
emissions. A unique multipoint
capability allows local area networks
to be formed with the isolation and
data security of a fiber optic data
highway.
The LDM85 is packaged in a rugged
aluminum enclosure small enough
to mount on the back panel of
typical computer equipment, saving
valuable desk and floor space. The
RS-232 connection is through male
or female EIA 25-pin connectors.
The fiber optic connection is either
through SMA (905) or ST connectors. Additional features
include a TD/RD reversing switch
for connection to DTE (Data
Terminal Equipment) or DCE (Data
Communication Equipment) ports,
three diagnostic LED indicators, and
locally connected handshake lines.
The TTL port combined with the
RS-232 port may be interfaced to
RS-422/423 ports. The LDM85 optical transmitter is
optimized for launching power into
fiber sizes 85/125, 100/140, and 200µm plastic coated silica
(PCS). Due to a lensed optical
system, receiver response does
not vary with fiber size.
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† All dollar amounts on this site are shown in US currency.
Note: Includes operator’s manual. Transformer powered units also include 120 Vac wall mount transformer.
