724-746-5500 blackbox.com
BL A C K B O X®
2 of 3
06/28/2010
#15619
A typical application using a High-Speed Opto-Isolator and a 12-VDC Power Supply.
» Fiber optic circuitry.
» Stops ground-potential differences up to
2500 volts.
» Small and lightweight.
» Choose from models for RS-232 and RS-422/
RS-485 protection.
» SP340A-R3 supports data rates up to 115.2 kbps.
» SP401A–SP402A maximum speedis 19.2 kbps.
» Optional power supply availablefor RS-232
model.
» Use the RS-422/RS-485 isolators in 4-wire
applications.
» Transparent operation.
FEATURES
Guard your asynchronous data and equipment from ground loops
between buildings with BLACK BOX® Opto-Isolators.
A ground loop occurs when the ground potential is different on
each end of the cable. These often occur from one floor to another,
from one building to another, or anywhere there are widely spaced
sites that have different earth-grounding systems or characteristics
and dissimilar electrical demands.
The difference in potential causes dangerous currents that can
fry your equipment. An Opto-Isolator, however, stops those currents
dead—they simply can’t get across the optical barrier. It keeps any
difference in ground potential at each end of a data link from
interfering with data integrity or damaging the attached equipment.
The device does this by creating two electrical circuits (where
otherwise there would have been only one) and separating these
circuits with an “air gap” that electrical energy can’t cross, but
RS-232, RS-422, or RS-485 signals—translated into pulses of
light—can.
Each model offered provides up to 2500 volts of optical isolation
between a DTE and a DCE device in a point-to-point setup. Because
it’s small (less than an inch high) and lightweight (at less than a
pound), it doesn’t get in your way.
SP340A-R3, PS1002
For RS-232 serial equipment that’s running at a high rate
of speed (up to 115.2 kbps), use the High-Speed Opto-Isolator
(SP340A-R3). It plugs directly into the DTE and connects to the DCE
by a short cable.
OVERVIEW
The device isolates four RS-232 signals. In addition to two data line
signals (TD and RD), the High-Speed Opto-Isolator passes one user-
configurable control signal in each direction. These isolation
capabilities make the device perfect for hardware flow control.
Two 8-position, easy-to-access DIP switches enable you to
configure the two user-configurable leads for the device to work
in a wide range of applications.
Designed to operate transparently, the High-Speed Opto-Isolator
begins operating as soon as it receives power. It usually requires no
external power supply for operation because it draws its power from
the RS-232 interface. But if the interface doesn’t give you enough
power, you can add an optional power supply: the 12-VDC Power
Supply (PS1002). This 120-VAC, 60-Hz unit can provide 12 VDC of
secondary voltage to Pin 9 of the isolators.
You also need to use the PS1002 with the SP340A-R3 if you
want to protect equipment separated by greater distances against
ground loops.
SP401A–SP402A
These Opto-Isolators protect against ground loops between
equipment with RS-422/485 interfaces, isolating four signals
(XMT+, XMT-, RCV+, and RCV-) in the process.
Both support async data rates up to 19.2 kbps and draw their
power from the receive pair of the RS-422/RS-485 interface.
The Opto-Isolator II (SP402A) differs from the SP401A in that it
has a 4-screw terminal block with strain relief instead of an RJ-45
jack on each side. Both models support 4-wire operation only.
As with the RS-232 High-Speed Opto-Isolator, the RS-422/RS-485
models have DIP switches for configuration purposes.
Opto-Isolator
(SP340A-R3)
RS-232 Device
Wall Jack
Remote Host
12-VDC Power Supply
(PS1002)
724-746-5500 blackbox.com
BL A C K B O X®
3 of 3
06/28/2010
#15619
Item Code
For RS-232 applications, order…
High-Speed Opto-Isolator (115.2 kbps)
SP340A-R3
You may also need…
12-VDC Power Supply
PS1002
For 4-wire RS-422/RS-485 applications using RJ-45 connectors,
order…
RS-422/RS-485 Opto-Isolator (19 kbps)
SP401A
For 4-wire RS-422/RS-485 applications using screw terminal
connectors, order…
Opto-Isolator II (19 kbps)
SP402A
TECH SPECS
SP340A-R3, SP401A–SP402A:
Approvals — 89/336/EEC; FCC Part 15, Class A
Isolation — 2500 V RMS maximum load capacity
Protocol — Asynchronous, full or half-duplex
Speed (Maximum) — SP340A-R3: 115.2 kbps;
SP401A–SP402A: 19.2 kbps
User Controls — (2) 8-position DIP switches
Interface — SP340A-R3: RS-232;
SP401A–SP402A: RS-422/RS-485
Connectors — For DCE and DTE:
SP340A-R3: (1) DB25 F, (1) DB25 M;
SP401A: (2) RJ-45 F;
SP402A: (2) 4-screw terminal blocks
Temperature Tolerance — SP340A-R3: 32 to 122ºF (0 to 50ºC);
SP401A–SP402A: 32 to 140ºF (0 to 60ºC)
Humidity Tolerance — 5 to 95% noncondensing
Power — SP340A-R3: Interface powered; may also require optional
power supply (PS1002);
SP401A–SP402A: Interface powered only
Size — 0.8"H x 2.1"W x 3.8"D (2 x 5.3 x 9.7 cm)
Weight — 0.8 lb (0.4 kg)
PS1002:
Approvals — FCC Part 15, Class A, UL®; cUL
Connectors — Input: (1) Wallmount 2-prong plug;
Output: 1⁄8 jack
Power — Input: 120 VAC, 60 Hz, 0.1 A;
Output: 12 VDC, 100 mA
Size — 1.5"H x 1.5"W x 2"D (3.8 x 3.8 x 5.1 cm)
Weight — 0.1 lb. (<0.1 kg)
SP340A-R3
Recognize any of these situations?
• Youwaitmorethan30minutestogetthrough
to a vendor’s tech support.
• Theso-called“tech”can’thelpyouorgivesyou
the wrong answer.
• Youdon’thaveapurchaseordernumberandthe
tech refuses to help you.
• It’s9p.m.andyouneedhelp,butyourvendor’s
tech support line is closed.
According to a survey by Data Communi cations magazine, 90%
of network managers surveyed say that getting the technical support
they need is extremely important when choosing a vendor. But even
though network managers pay anywhere from 10 to 20% of their
overall purchase price for a basic service and support contract, the
technical support and service they receive falls far short of their
expectations—and certainly isn’t worth what they paid.
At Black Box, we guarantee the best value and the best support.
You can even consult our Technical Support Experts before you buy if
you need help selecting just the right component for your application.
Don’t waste time and money—call Black Box today.
Why Buy From Black Box? Exceptional Value.
Exceptional Tech Support. Period.
