PLM-24 is a low cost and easy to build Power Line Modem capable to send and receive serial data
over the power lines (mains) at speed up to 2400 bps. PLM-24 lets you communicate with other devices
around the house without running any wires since it uses the wires already available in every house!
PLM-24 is designed as a small module (54 x 38 mm) to be used in new or existing designs, the picture
above shows a ready built unit. PLM-24 can easily be interfaced with any PC or microcontroller (MCU)
that are able to send and receive serial data at 2400 bps or less. Perfect for use with BASIC Stamp's, SX,
PIC, 8051, AVR, 68HC11, COP or standard PC's...
Or you can use it to send and receive messages or data (files) between personal computers and their devices
in a building without the need of cables. Use it as a low speed printer network for all in the building to share
or run a speech recognition program on your PC to "talk" with your home!
Combine both together and top it with some PLM-24 modules that have alarm sensors connected and you
will have a security system that is capable to dial up with your PC's modem and play a tune or send an fax or
e-mail if something goes wrong or your house is visited by unwanted people.
With PLM-24 you have the communication medium the rest is up to you! Below is a short list of some doable
things just to spark your imagination...
|- Control lights and other devices|
|- Security systems|
|- Energy control and management|
|- Process control|
|- Environmental control|
|- Low speed PC networks|
|- Heating and air condition control|
|- Sprinkler/watering systems|
|- Sophisticated HA systems|
|- Help for elderly and disabled people|
|- Chat system for buildings|
|- Measure temperature in rooms|
|- Small info terminals in rooms|
|- Close blinds if sunlight is to strong|
|- Let your PC control your home|
|- Stage control in home theaters|
Since PLM-24 is capable of both sending and receiving serial data over the power lines it's
implement a protocol that uses checksums or CRC to ensure that received data is correct and if it isn't ask
for a re-transmission! The module itself is protocol independent so you can use how simple or complicated
protocol you want (send ASCII or binary). Since the environment on the power line isn't very friendly it is
wise to implement some way to check for errors and we recommend that you do but it's not necessary.
By being protocol independent the PLM-24 doesn't limits to any max numbers of power line modems used
in your network, it's up to you. You can have as few as two PLM-24 and our S.N.A.P network protocol
will let you have up to 16.7 millions nodes in your HA network!
Picture to the left shows a ready built PLM-24 Power Line Modem.
|Rx/Tx||Input||Rx/Tx mode select|
|TxD||Input||Transmit data in|
|RxD||Output||Received data out|
Picture to the right shows two PLM-24 PCB's.
If you have any other questions please contact firstname.lastname@example.org.
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