1
Handles up to 50 drops
without compromising
signal quality.
Some models support
115.2 kbps speeds up
to 3 miles (4.8 km).
Other models support
38.4kbps speeds up to
9.4 miles (15.1 km).
Surge-protected
models are available.
Works with 2- or
4-wire twisted-pair
cable.
Choose from 5-screw
terminal block, RJ-11,
or RJ-45 models.
Point-to-point or
multipoint.
W
hen you need high speed and
support for up to 50 drops,
choose the Multipoint Mini Driver
(Mini Driver MP).
Two or more mini drivers carry
asynchronous communication
between computers and
terminals.
In multipoint mode, the
ME771A–773A-R2 series boasts
speeds of up to 115.2 kbps at a
distance of up to 3 miles (4.8 km).
The ME745A-R2 supports speeds
up to 38.4 kbps at a distance of
9.4 miles (15.1 km) using 19 AWG
cable or 4.4 miles (7.1 km) using
24 AWG cable.
The mini driver operates in full
or half-duplex mode over 4-wire,
and in half-duplex mode only over
2-wire, telco-type lines.
The mini driver also meets the
RS-485 pinning standards for a
multipoint environment. However,
the mini driver doesn’t meet the
electrical standards for the
MINI DRIVER MP
Speed, distance, and 50 drops
for multipoint data distribution.
Key Features
MULTIPOINT MINI DRIVER (MINI DRIVER MP)
RS-485 interface and shouldn‘t be
used as an RS-485-to-RS-232
converter.
You can strap the mini driver’s
carrier to be constantly ON or to
be controlled by the RTS signal.
Operating with a controlled
carrier allows you to connect mini
drivers in multipoint configur-
ations over 2 or 4 wires. Special
circuitry isolates inactive transmit
wire pairs.
You can also set a separate
jumper for high or low impedance
on the receive circuit. This en-
ables the mini driver to work
properly in multipoint configur-
ations—up to 50 polled
modems—without degrading the
distance. Also, you can use
controlled carrier in applications
that require passing a control
signal end to end—for instance,
when the RTS on one mini driver
is passed to the DCD on the other
mini driver. A circuit allows a user
working in half-duplex mode to
receive an echo from the mini
driver if the terminals or computer
programs used don’t have an
echo option.
Plus, it’s ideal for use with
devices that use hardware flow
control.
To protect your data from
ground loops, surge-protection
models feature 600 watts per wire
of built-in security.
The mini driver operates
without batteries or AC power. It
receives its power from the
RS-232 interface signals Receive
Data (RD, Pin 2), Request to Send
(RTS, Pin 4), and Data Terminal
Ready (DTR, Pin 20).
Use the Multipoint Mini Driver
(Mini Driver MP) to link several
buildings within your corporate
campus. It’ll ensure reliable trans-
mission of your short-haul com-
munications far beyond the
RS-232 limit.
Black Box Corporation
• 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 •
www.blackbox.com
•
e-mail: [email protected]
© 2005. All rights reserved.
Black Box Corporation.
8/9/2005
#15004