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====== Wrong encoding on the serial port? ======

What we get with the logic analyzer:

<code>
Time [s],Value,Parity Error,Framing Error
0.591529000000000,W (0x57),,
0.592088833333333,+ (0x2B),,
0.592720333333333,1 (0x31),,
0.593911750000000,9 (0x39),,
0.594445583333333,. (0x2E),,
0.595435166666667,6 (0x36),,
0.595978750000000,0 (0x30),,
0.596512583333333,0 (0x30),,
0.597056250000000,0 (0x30),,
0.597658416666667,0 (0x30),,
0.598202083333333,0 (0x30),,
0.598735916666667,0 (0x30),,
0.599289250000000,N (0x4E),,
0.599901250000000,3 (0x33),,
0.600483916666667,2 (0x32),,
0.601017750000000,3 (0x33),,
0.601587416666667,0 (0x30),,
0.602147333333333,0 (0x30),,
0.602681166666667,. (0x2E),,
0.603315916666667,1 (0x31),,
0.603869250000000,N (0x4E),,
0.604406416666667,? (0x3F),,
0.604940250000000,? (0x3F),,
0.605474083333333,? (0x3F),,
0.606007916666667,? (0x3F),,
0.606541750000000,? (0x3F),,
0.607075583333333,? (0x3F),,
0.607658333333333,? (0x3F),,
0.608192166666667,? (0x3F),,
0.608726000000000,? (0x3F),,
0.609259833333333,? (0x3F),,
0.609793666666667,? (0x3F),,
0.610327500000000,? (0x3F),,
0.610858083333333,? (0x3F),,
0.611392000000000,? (0x3F),,
0.611984416666667,2 (0x32),,
0.612531250000000,0 (0x30),,
0.613074916666667,0 (0x30),,
0.613608750000000,5 (0x35),,
0.614142583333333,'3' (0x03),,
</code>

What arrives at /dev/ttyAMA0:

<code>
<Buffer 00 54 6a 9d 00 63 34 00 ec f6 f6 f6 f6 f6 66 4b a6 96 e6 e6 36 f3 66 2b 2c 2c 4c 58 58 18 60 60 60 60 60 60 60 60 b3 f6 56 96>
</code>

I'm connecting using the same parameters as the decoder in the logic analyzer; baudrate 19200, databits 8, stopbits 1, parity none.

The manual of the weather station says that we should receive exactly 40 bytes, but when I read 40 bytes with Node.js, the whole streamblock gets shifted. I need to read 42 bytes, sometimes 43 bytes.
===== Horizontally represented: =====

<code>
00 54 6a 9d 00 63 34 ...
</code>

instead of

<code>
57 2B 31 39 2E 36 ...
</code>

57: W (start bit weather-data)\\
2B 31 39 2E 36: +19.6° (temperature)

It's sent directly as ASCII chars, hex encoded. Unfortunately, something went wrong in /dev/ttyAMA0.

{{:sfera:weather-station.png?nolink|}}

===== Suddenly, it works =====

<code>
root@raspberrypi:~/dali# coffee wetter.coffee 40
undefined
<Buffer 57 2b 32 34 2e 34 30 30 30 30 30 30 4e 34 39 39 30 31 2e 32 4e 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 32 30 31 35 03>
<Buffer 57 2b 32 34 2e 34 30 30 30 30 30 30 4e 34 39 38 30 31 2e 32 4e 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 32 30 31 34 03>
<Buffer 57 2b 32 34 2e 34 30 30 30 30 30 30 4e 34 39 38 30 31 2e 32 4e 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 32 30 31 34 03>
<Buffer 57 2b 32 34 2e 34 30 30 30 30 30 30 4e 34 39 37 30 31 2e 32 4e 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 32 30 31 33 03>
<Buffer 57 2b 32 34 2e 34 30 30 30 30 30 30 4e 34 39 37 30 31 2e 32 4e 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 32 30 31 33 03>
^

<Buffer 57 2b 32 35 2e 31 30 30 30 30 30 30 4e 35 36 35 30 30 2e 35 4e 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 3f 32 30 30 39 03>
1: W
2: +
3: 2
4: 5
5: .
6: 1
7: 0
8: 0
9: 0
10: 0
11: 0
12: 0
13: N
14: 5
15: 6
16: 5
17: 0
18: 0
19: .
20: 5
21: N
22: ?
23: ?
24: ?
25: ?
26: ?
27: ?
28: ?
29: ?
30: ?
31: ?
32: ?
33: ?
34: ?
35: ?
36: 2
37: 0
38: 0
39: 9
40:
</code>

<code>
SerialPort = require 'serialport'

port = new SerialPort "/dev/ttyAMA0",
        baudRate: 19200
        dataBits: 8
        stopBits: 1
        parity: 'none'
        rtscts: true
        xon: true
        xoff: true
        xany: true
        #parser: SerialPort.parsers.readline 0xf9
        parser: SerialPort.parsers.byteLength process.argv[2]
        #parser: SerialPort.parsers.raw
        #parser: SerialPort.parsers.byteDelimiter [0xf9]

port.on 'open', (data) ->
        console.info data

port.on 'error', (data) ->
        console.info "error: ", data

port.on 'data', (data) ->
        console.info data
        i = 1
        for d in data
                console.info "#{i}: #{hex2ascii(d)}"
                i++

dec2bin = (dec) ->
        (dec >>> 0).toString(2)

hex2ascii = (hex) ->
        String.fromCharCode hex

</code>