Iriave Electronics located in Italy has developed and patented power
line innovative interfaces with ASK (access security key) and FSK
(frequency shift keying) modulation able to connect to any microcontroller
or TTL (transistor-transistor logic) level devices, in order to control
and receive data from electrical devices (motors, lights, etc.) by using
power line as a bus for information interchange.
The device developed by Iriave Electronics is a hardware interface that
allows control data communication over the power line. Its purpose is that
of translating the serial output provided by some digital service, like a
microcontroller, into a coded pulse train that is suitable for being
transmitted over the usual domestic power lines. Conversely, the interface
is able to extract such messages from the power line and to convert them
into serial streams that the connected digital device can read. The
interface therefore acts like a modem, allowing the employment of the
common electrical supply network of a building as a local area network.
When coupled with a programmable digital device, such as a
microprocessor or a microcontroller, the patented device allows the
realization of "intelligent" and "communicative" equipments that can
interact with similar objects over a domestic network, without the need of
installing a dedicating wiring. Typical applications are in the field of
Home and Building Automation (management of surveillance and alarm
systems, home appliances automation, AMR (Automatic Meter Reader),
Application Bluetooth and Wireless, Power line mode, Home automation
control, Security and surveillance, General-purpose isolated transceiver,
Internet appliances).
The innovative feature of these devices is that they transmit data on
the power line, using the concept of conveyed wave (zero crossing), and in
the presence of noise on power line, such as in industrial environments,
those can be used to transmit data on a cc Bus.
Eventually, the X10 protocol (extended functions) can be used for some
applications.
Our technology allows introducing for the first time the chance to use
sensors or on power line or on Bus.
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TRANSCEIVER TR-2
(PATENTED)
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PIN
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FUNCTION
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1
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In from 12 to
24 V
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2
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GND-ground
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3
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Out 5V
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4
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Data receiver
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5
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Zero -crossing
detection
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6
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Data
transmission
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7
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Transmission
Enable
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8
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Power Line
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9
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Power Line
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TRANSCEIVER TR-3
(PATENTED)
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TDA5051 on board
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PIN
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FUNCTION
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1
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In from 12 to
24 V
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2
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GND-ground
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3
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Out 5V
(Inverted logic)
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4
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Data receiver
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5
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Zero -crossing
detection
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6
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Data
transmission
(Inverted logic)
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7
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Transmission Enable
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8
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Power Line
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9
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Power Line
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INDEX
INDEX.. 2
Introduction.. 3
APPLICATIONS. 3
HOW TO USE TR-2 TR-3. 3
TR-2 functioning diagrams. 4
TR-3 functioning diagrams. 4
CONFIGURATION 1. 5
DIRECT
CONNECTION TO PC.. 5
CONFIGURATION 2. 7
CONNECTION TO
PIC16F877. 7
CONFIGURATION 3. 9
CONNECTION TO T89C51RD2 (COMPATIBLE 8051 FAMILY) 9
TW523 EMULATOR AND COMPATIBLE PRODUCTS. 10
PLI (Power
Line Interface) 10
APPLIANCE. 11
DIMMER.. 11
CONCLUSIONS. 12
WARNING: 12
TR-2 and TR-3 are used for communicating between users. They are
integrating components for transmitting and receiving data TTL interfaced.
APPLICATIONS
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AMR (Automatic Meter Reader)
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Application Bluetooth and Wireless
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Power line modem
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Home automation control
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Security and surveillance
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General-purpose isolated transceiver
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Internet appliances
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Other
HOW
TO USE TR-2 TR-3
TR-2 and TR-3 devices work in a similar way.
TR-2 can transmit from 50 to 1200 bits per second with a low BER.
TR-3 can transmit from 50 to 2400 bit per second with a low BER but
it is more sensitive in receiving. It can cover a wider range.
On pin1, devices are supplied at 12-24 V, on pin3, they provide an
out Vout = 5V with
IMAX=100
mA (do not connect pin3 to external power line sources).
Pin5 detects the zero crossing: at every step for the zero the out
changes the logic level, it can be used for synchronizing to power line.
Pin4 provides the out of the received data, pin6, is the in for the
transmitted data.
For TR-2, be sure to set TX pin at low level to avoid damaging the
unit.
Transmission: bring TX EN high 0.5 ms before sending data. After
sending data bring, TX EN low.
Receiving: signal at 120 KHz brings the RX pin high, while the
absence of signal brings it low.
For TR-3, be sure to set TX pin at high
level to avoid damaging the unit.
Transmission: bring TX EN high 0.5 ms before
sending data according to inverted logic.
After sending data, bring TX EN low.
Receiving: signal at 120
KHz brings the /Rx pin low, while the absence of
signal brings it high.
By keeping TX EN high the power line impedance decreases.
CONFIGURATION
1
DIRECT
CONNECTION TO PC
TRANSMISSION WITHOUT ZERO-CROSSING BETWEEN TWO PCs
(RS232)ON POWER LINE
In order to transmit the transceivers to the PC by a MAX232 you must
adapt the levels.
You can deduce the connections from the following electrical schematics.
Fig. 1 Levels adaptor for TR-2
Fig. 2 Levels adaptor for TR-3
If levels are
adapted as in figs. 2 and 3, the reception stops working when RX/TX is low and
TX EN is high (this occurs in transmitting data when RTS is enable).
As a
consequence, it is not possible to receive the transmitted data (absent echo).
LED SIGNALS: red for supply presence, yellow
for data receiving, green for data transmission.
They are optional.
Fig.3 PC interface with MAX232.
Fig.4 Circuit power line supply at 24Volt.
To transmit with this circuit you need activating PIN RTS (7) at 0,5
ms before transmitting data,
to put the device in transmission (TX EN high).
We manufacture a PC interface in kit form. Contact us for further
information.
A demo programme has been developed for this operation.
It is available on
www.iriave.it
or you can ask for it at
iriave@iriave.it.
Note: This configuration only works with this type of flow hardware
control.
CONFIGURATION
2
CONNECTION
TO PIC16F877
Microchip provides an AN236 application note that is complete of
firmware and electrical schematics that develop a project for Home Automation.
Link:
http://www.microchip.com/stellent/dcplg?IdcService=SS_GET-AGE&nodeld=1824&appnote=en012050
The application note describes, in figs. C3, C4 and C5, a direct
coupling on power line.
In AN236 application note, it is possible to substitute the transceiver
and the zero-crossing detection with TR-2 o TR-3, because our devices are
optoisolated and coupled by transformers on power line increasing the
safety of the application.
Fig.5: Connection
to PIC16F877
The TR-2 o TR-3 typical connection is represented here.
CONFIGURATION 3
The software for programming the device can be downloaded from
www.Amtel.com in the section
Products /
8051
Architecture / FLIP.
(http://www.atmel.com/dyn/products/tools_card.asp?tool_id=2767).
