COMPACT BIDIRECTIONAL AUTOSWITCHES

COMPACT BIDIRECTIONAL AUTOSWITCHES
© 2000. All rights reserved.
Black Box Corporation.
COMPACT BIDIRECTIONAL AUTOSWITCHES
Use these sharers with laser
printers or other devices requiring
a bidirectional IEEE 1284 interface.
Key Features
Fully compatible with
IEEE 1284, ECP/EPP,
Centronics , byte, and
nibble modes.
®
Data transfer rate of up
to 2 MBps.
Provides PC to PC
high-speed data
transfer via the
parallel port.
Built-in
microprocessor
provides real-time
communication.
Operates in auto-link
or manual mode.
Just plug and play!
Includes software.
any of today’s printers use the
bidirectional IEEE 1284
interface which enables the
printer to communicate with your
PC.
Bidirectional Autoswitches
are fully IEEE 1284 compatible and
enable you to share printers,
scanners, Zip drives, CD-ROM
drives, digital cameras, and more.
You can even use the switches
for PC-to-PC high-speed data
transfer via the parallel port.
All three models support
speeds up to 2 MB per second
and are fully compatible with the
IEEE-1284 standard as well as
ECP/EPP, Centronics, Byte, and
nibble modes. A built-in
microprocessor provides realtime communication between
devices.
The switches automatically
sense BiTronics or Centronics
printers. And they work with
DeskJet printers without
M
®
6/19/2000
#21872
disabling the bidirectional
communications.
You can set the time out
period between print jobs from 5
seconds up to 40 seconds.
Bidirectional Autoswitches
install easily—just plug and play.
Easy-to-read LEDs indicate which
channel is in use.
The Reversible Bidirectional
AutoSwitch connects two
computers to one IEEE-1284
BiTronics printer or other parallel
device. Or use two parallel
devices with one computer.
Supports Windows 95 direct
cable connection.
Bidirectional Dual Bus
AutoSwitches connect two or
four computers to two IEEE-1284
BiTronics printers or other parallel
devices.
Dual-bus architecture
features two independent
channels for simultaneous access
to parallel devices and file
transfer.
Supports Windows 3.1, 95, 98,
and Windows NT .
®
®
Typical Application
Reduce printer costs and increase user options by having four PCs
share two laser printers.
Specifications
Maximum Distance — 5 m
Maximum Transfer Rate — 2 MB
per second
Connectors — (3), (4), or (6) DB25 F
Indicators — LEDs: SW177A: None;
SW178A: (2) channel in use;
SW179A: (4) channel in use
Operating Temperature — 5 to 40°C
Technically Speaking
Power — Interface-powered or
optional power supply
Size —
SW177A: 2.5 x 8.1 x 9.1 cm;
SW178A: 2.5 x 17.8 x 9.1 cm;
SW179A: 2.5 x 19.1 x 9.1 cm
Weight — SW177A:0.1 kg; SW178A:
0.2 kg; SW179A: 0.2 kg
The 1284 standard is an IEEE
standard called “Signalling
Method for a Bidirectional
Parallel Peripheral Interface for
Personal Computers” used for
bidirectional parallel-printer-bus
support.
While standard parallel
interfaces can support speeds of
up to 150 kbps at distances of up
to 1.8 m, IEEE 1284 parallel
interfaces can send your data
over six times faster and more
than five times the distance.
The standard specifies:
• All signals are twisted with a
signal line twisted to its
ground return.
• Each signal and ground
return must have a
characteristic impedance of
62±6 ohms over the frequency
band of 4 to
16 MHz.
• The wire-to-wire
crosstalk shall be no
greater than 10%.
• The cable will have shielding
with a minimum of 85% optical
braid coverage over foil.
• The cable shield shall be
connected to the connector
back shell using a 360°
concentric method. A pigtail
connection is not acceptable.
• Compliant cable assemblies
shall be marked: “IEEE Std
1284-1994 Compliant.”
The standard defines two
interface levels and specifies a
physical and electrical interface.
The Level I Interface is for
devices that need reverse-mode
capabilities but do not operate at
high speeds. The Level II interface
is for both bidirectional and highspeed communications.
The 1284 standard also
defines connectors for use in the
parallel interface. The 25-pin
DB25 connector is defined as the
Type “A” connector. The Telco
36, 36-conductor, 0.085" centerline
Champ connector with bale locks
is defined as the Type “B”
connector. The Type “C”
connector is a 36-contact, 0.050"
centerline mini connector with
clip latches.
Ordering Information
ITEM
CODE
Compact Bidirectional AutoSwitches
Reversible 1-to-2, 2-to-1.....................................SW177A
Dual Bus 2-to-2..................................................SW178A
4-to-2..................................................SW179A
You may also want to order…
Enhanced Parallel Port Cable, 1.8-m
DB25 M/M.......................................................EQN200-0006
DB25 M/...........................................................EQN201-0006
DB25 M/Centronics 36 M............................EQN202-0006
21872
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement