130 lines
4.8 KiB
HTML
130 lines
4.8 KiB
HTML
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<html>
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<head>
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<title>Projects - just for fun</title>
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</head>
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<body>
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Now, also the water meter talks to me.
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<a href="http://a385e-5.de/wp-content/uploads/2013/09/Wasserzaehler.jpg"><img src="http://a385e-5.de/wp-content/uploads/2013/09/Wasserzaehler-225x300.jpg" alt="Wasserzaehler" width="225" height="300" class="alignnone size-medium wp-image-173" /></a>
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(Note the thin grey cable, thats the M-Bus cable.)
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And, after a small modification of the circuit I can talk to water meter and electric power meter connected in parallel to the master.
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<blockquote>
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<a href="http://a385e-5.de/wp-content/uploads/2013/09/laser-drucker_005120.jpg"><img src="http://a385e-5.de/wp-content/uploads/2013/09/laser-drucker_005120-209x300.jpg" alt="laser-drucker_005120" width="209" height="300" class="alignnone size-medium wp-image-192" /></a>
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IC2 was already added in the last step, since the output of the analog circuit and the requirements of the MCU didnt match concerning their logical polarity.
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Now, T3 (BS108) and R9 (2k2) have been added to disable the receive path while data is transmitted.
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</blockquote>
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Responding the <code>REQ_UD2</code> command, the water meter sends this telegram (address 0x30 has been assigned to it first):
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<code>
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so 10 5b 30 8b 16
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success
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SO RESP: 68 46 46 68 08 30 72 45 71 43 00 24 23 25 07 02 00 00 00 0C
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13 51 84 00 00 8C 10 13 00 00 00 00 0B 3B 00 00 00 0B 26 62 06 00 02
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5A CC 00 04 6D 17 16 A9 19 7C 13 00 00 00 00 FC 10 13 00 00 00 00 72
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6C 00 00 42 EC 7E BF 1C 35 16
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</code>
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A closer look, consulting the <a href="http://www.m-bus.com/mbusdoc/md8.php" title="M-Bus documentation" target="_blank">M-Bus documentation</a> reveals the meaning:
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[table]Octet(s), Field, Meaning
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<code>68 46 46 68</code>, Preamble with length,
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<code>08</code>, C field,
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<code>30</code>, A field (address),
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<code>72</code>, CI field, variable data response
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<code>45 71 43 00</code>, Ident. No.,
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<code>24 23</code>, Manufacturer , HYD = Hydrometer GmbH
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<code>25</code>, Version,
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<code>07</code>, Medium, Water
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<code>02</code>, Access No.,
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<code>00</code>, Status,
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<code>00 00</code>, Signature,
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<code>0C</code>, DIF, 8 digit BCD
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<code>13</code>, VIF, Volume; 10^(3-6)m^3
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<code>51 84 00 00</code>, Value, 8.451m^3
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<code>8C</code>, DIF, ext; 8 digit BCD
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<code>10</code>, DIFE, minimum value
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<code>13</code>, VIF, Volume; 10^(3-6)m^3
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<code>00 00 00 00</code>, Value, 0
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<code>0B</code>, DIF, 6 digit BCD
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<code>3B</code>, VIF, Volume flow; 10^(3-6)m^3/h
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<code>00 00 00</code>, Value, 0
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<code>0B</code>, DIF, 6 digit BCD
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<code>26</code>, VIF, Operating time; hours
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<code>62 06 00</code>, Value, 662h = 27.6d
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<code>02</code>, DIF, 16bit integer
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<code>5A</code>, VIF, Flow Temperature; 10^(2-3)°C
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<code>CC 00</code>, Value, 20.4°C
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<code>04</code>, DIF, 32bit integer
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<code>6D</code>, VIF, Time Point; time&date
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<code>17 16 A9 19</code>, Value,
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<code>7C</code>, DIF, LSB; value during error state; 8 digit BCD
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<code>13</code>, VIF, Volume; 10^(3-6)m^3
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<code>00 00 00 00</code>, Value, 0
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<code>FC</code>, DIF, ext; LSB; value during error state; 8 digit BCD
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<code>10</code>, DIFE, tariff 1
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<code>13</code>, VIF, Volume; 10^(3-6)m^3
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<code>00 00 00 00</code>, Value, 0
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<code>72</code>, DIF, LSB; value during error state; 16bit integer
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<code>6C</code>, VIF, Time Point; date
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<code>00 00</code>, Value, 0
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<code>42</code>, DIF, LSB; 16bit integer
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<code>EC</code>, VIF, ext; Time Point; date
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<code>7E</code>, VIFE, ??
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<code>BF 1C</code>, Value,
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<code>35</code>, Checksum,
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<code>16</code>, Stopbyte,
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[/table]
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Decoding of the time&date type is done like this:
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<pre>
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if (t_data)
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{
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if (t_data_size == 4) // Type F = Compound CP32: Date and Time
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{
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if ((t_data[0] & 0x80) == 0) // Time valid ?
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{
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t->tm_min = t_data[0] & 0x3F;
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t->tm_hour = t_data[1] & 0x1F;
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t->tm_mday = t_data[2] & 0x1F;
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t->tm_mon = (t_data[3] & 0x0F) - 1;
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t->tm_year = ((t_data[2] & 0xE0) >> 5) |
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((t_data[3] & 0xF0) >> 1);
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t->tm_isdst = (t_data[1] & 0x80) ? 1 : 0; // day saving time
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}
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}
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else if (t_data_size == 2) // Type G: Compound CP16: Date
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{
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t->tm_mday = t_data[0] & 0x1F;
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t->tm_mon = (t_data[1] & 0x0F) - 1;
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t->tm_year = ((t_data[0] & 0xE0) >> 5) |
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((t_data[1] & 0xF0) >> 1);
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}
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}
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</pre>
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(Found on github in the libmbus repo.)
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</body>
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</html>
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