HTH's On-Line Catalog - S.N.A.P

S.N.A.P - Scaleable Node Address Protocol

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S.N.A.P is an free and open network protocol. The protocol was primary developed for PLM-24 based
home automation and control systems but it is a generic protocol and not limited to this. S.N.A.P can be
used in any type of applications where an easy to learn and light weighted network protocol is needed.


- Easy to learn, use and implement.
- Free and open network protocol.
- Free development tools available.
- Scaleable binary protocol with small overhead.
- Requires minimal MCU resources to implement.
- Up to 16.7 million node addresses.
- Up to 24 protocol specific flags.
- Optional ACK/NAK request.
- Optional command mode.
- 8 different error detecting methods (Checksum, CRC, FEC etc.).
- Can be used in master/slave and/or peer-to-peer.
- Supports broadcast messages.
- Media independent (power line, RF, TP, IR etc.).
- Works with simplex, half-, full- duplex links.
- Header is scaleable from 3-12 bytes.
- User specified number of preamble bytes (0-n).
- Works with synchronous and asynchronous communication.
- Works with our free PLM-24 < > TCP/IP Gateway software.

S.N.A.P network protocol documentation.

You can download the S.N.A.P documentation in PDF-format by clicking on the link below. To view it you
will need the free Acrobat Reader from Adobe. If you don't already have it click on the "Get Acrobat Reader"

- S.N.A.P Version 1.00 (75 KByte).
- SNAPSCII Version 0.94 [Draft] (15 KByte).

S.N.A.P development tools.

- S.N.A.P Lab.
- S.N.A.P Test.
- S.N.A.P Protocol Encoder/Decoder DLL.
- S.N.A.P Linux dynamic library.
- S.N.A.P TCP/IP for PalmPilot.
- S.N.A.P Serial for PalmPilot.

More to come...

S.N.A.P related links.

- S.N.A.P vendor list.
- Request your own S.N.A.P Vendor ID#.
- S.N.A.P DLL bug report form.
- S.N.A.P Linux library bug report form.
- Debugsoft - Author of S.N.A.P DLL etc.
- Carl Walkers S.N.A.P - Linux home page.

S.N.A.P examples.

Below is a list of examples currently available for download. The S.N.A.P examples includes schematics
and well documented source code so they should give you an easy start. In some examples there are room
for much improvement and possibility to add more functionallity, we wanted to keep it as simple as possible
for easy understanding.

WIP = Work In Progress

Filename MCU Ver. Description
SNAP-001.ZIP BS1-IC 1.02 Turn a LED on and off
SNAP-002.ZIP BS1-IC 1.02 Lampdimmer node for PLM-24
SNAP-003.ZIP BS1-IC 1.02 Domestic AC current meter with PLM-24
SNAP-004.ZIP BS1-IC 1.02 Simple temperature node for PLM-24
SNAP-005.ZIP BS1-IC 1.02 Simple light measuring node for PLM-24
SNAP-006.ZIP BS1-IC 1.02 Air quality node for PLM-24
SNAP-007.ZIP BS1-IC 1.02 Simple humidity node for PLM-24
SNAP-008.ZIP BS1-IC 1.02 Simple 4-bit input node for PLM-24
SNAP-009.ZIP BS1-IC 1.02 WakeUp alarm node for PLM-24
SNAP-010.ZIP BS1-IC 1.02 Four channel plant moisture sensor I
SNAP-011.ZIP BS2-IC 1.02 Turn a LED on and off
SNAP-012.ZIP BS2-IC 1.02 Shows how to implement background tasks
SNAP-013.ZIP BS2-IC 1.02 PLM-24 to X-10 Gateway
SNAP-014.ZIP BS2-IC 1.02 8-bit parallel input node for PLM-24
SNAP-015.ZIP BS2-IC WIP Programmable light monitor node for PLM-24
SNAP-016.ZIP 89C2051 1.02 Turn a LED on and off
SNAP-017.ZIP BS2-IC 1.02 IR detector alarm node for PLM-24
SNAP-018.ZIP BS2-IC 1.02 Four channel relay node with local control
SNAP-019.ZIP BS2-IC 1.02 1-8 zones security system node for PLM-24
SNAP-020.ZIP BS2-IC WIP DCF-77 atomic clock node for PLM-24
SNAP-021.ZIP BS2-IC 1.02 Fire alarm node for PLM-24
SNAP-022.ZIP BS1-IC 1.02 1-channel 8-bit A/D converter node
SNAP-023.ZIP 89C2051 1.02 Simple 16 x 1 LCD terminal node for PLM-24
SNAP-024.ZIP 89C2051 1.02 Simple 16 x 1 LCD info node for PLM-24
SNAP-025.ZIP 89C2051 1.02 S.N.A.P packet spy node for PLM-24
SNAP-026.ZIP BS2-IC 1.00 Testprogram for S.N.A.P Serial for PalmPilot
- - - More to come...

User supplied S.N.A.P examples.

Below is a list of examples submitted by S.N.A.P users. If you have any examples that you would like to
share with others feel free to e-mail them to us and we will add it to the list. All credits should go to the author
of respectively example.

Filename Author Description
SNAPAVR.ZIP Mike Eitel AVR example using a 90S8515 and STK200 development kit
SNAP-IO.ZIP Claus Kuehnel BASCOM-AVR example turning simple LED ON/OFF
SNAP-MON.ZIP Claus Kuehnel BASCOM-AVR example displays S.N.A.P packets on LCD
PICTOOLS.ZIP Emiliano Castricini Implement S.N.A.P in PIC assembler includes Windows 9x utility
AVRSNAP01.ZIP Göran Nordahl S.N.A.P AVR assembler example for Atmel AT90Sxxxx
AVRSNAP02.ZIP Göran Nordahl Interrupt driven node that implements S.N.A.P in AVR-assembler
AVRSNAP03.ZIP Göran Nordahl S.N.A.P AVR assembler example for Atmel AT90Sxxxx
AVRSNAP04.ZIP Göran Nordahl S.N.A.P AVR assembler example for Atmel AT90Sxxxx
C-HEADER.ZIP Frits Senders C-header file for SNAP.DLL 1.10
CC139.ZIP Colin O'Flynn Source code and PCB to S.N.A.P article in Circuit Cellar #139
GCC01.ZIP Colin O'Flynn CHKSUM, CRC8 and CRC16 routines in AVR-GCC
- - More to come...

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