Serge NOEL
159 lines
6.6 KiB
Plaintext
159 lines
6.6 KiB
Plaintext
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<title>JMRI Hardware Support - Digitrax DS54 Examples</title>
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<meta name="author" content="Bob Jacobsen">
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<h1>Hardware Support: DS54 Examples</h1>
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<p class="subtitle">Examples of using a Digitrax DS54 with JMRI.</p>
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<p>The Digitrax DS54 accessory decoder can be configured in a large number of ways (<a href=
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"../../../manual/index.shtml">DecoderPro</a> can help with that).</p>
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<p>Walter Thompson walked through the details of this:</p>
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<p>With the DS54 at defaults these are the LocoNet® msgs when either Switch A or Aux A goes
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positive causing the Turnout to "toggle" state:<br>
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When Switch A (blue lead) goes high LocoNet msg [b2 8 70 35].<br>
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When Aux A (orange lead) goes high LocoNet msg [b2 8 50 15]</p>
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<p>I then set "When Switch A input changes, send" ="Turnout feedback msg"<br>
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When Switch A (blue lead) goes high LocoNet msg [b2 8 70 36]<br>
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When Aux A (orange lead) goes high LocoNet msg [b2 8 50 15]</p>
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<p>I then set "When Aux A input changes, send"= "Turnout feedback message"<br>
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When Switch A (blue lead) goes high LocoNet msg [b2 8 70 36]<br>
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When Aux A (orange lead) goes high LocoNet msg [b2 8 50 16]</p>
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<p>Therefore, when the Switch and Aux inputs are set to send a turnout feedback message, the
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feedback mechanisms built into recent versions of JMRI can be used to track the turnout state
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when the local inputs are used to change the turnout.</p>
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<h2>Exact Feedback</h2>
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<p>To use exact feedback, you need to connect two microswitches to the turnout and to the
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Switch and Aux inputs on the DS54. (You can use the built in Tortoise contacts for this)</p>
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<p>Configure the DS54 channel with:</p>
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<span class="wide">
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<code>
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Aux A input"='Active ON, trigger on change, Positive Level"
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Aux A task"="No Output change"
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When Aux A input changes, send"= "Exact turnout feedback message"
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Switch A input"='Active ON, trigger on change, Positive Level"
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Switch A task"="No Output change"
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Switch A input changes, send"= "Exact turnout feedback message"
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</code>
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</span>
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<p>Configure Turnout LT9 (via the Turnout Table) to use "EXACT" feedback.</p>
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<table>
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<tr>
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<th>Commentary</th>
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<th>LocoNet messages</th>
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</tr>
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<tr>
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<td>Start with Turnout 9 closed<br>
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Switch A will be Closed and Aux A open.</td>
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<td>none</td>
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</tr>
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<tr>
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<th colspan="2">
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</th>
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</tr>
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<tr>
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<td>Issue a "Throw Turnout 9" command from<br>
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the throttle or the turnout table</td>
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<td><code>[b0 8 10 57]</code> Requesting Switch at 9 to Thrown (output On)<br>
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<code>[b0 8 0 47]</code> Requesting Switch at 9 to Thrown (output Off)</td>
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</tr>
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<tr>
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<td>Turnout starts to move and opens Switch A</td>
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<td><code>[b1 8 60 26]</code> Turnout 9 Switch input is Thrown (input on)</td>
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</tr>
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<tr>
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<td>Moving turnout closes Aux A and reaches the end of its travel.</td>
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<td><code>[b1 8 50 16]</code> Turnout 9 Aux input is Closed (input off)</td>
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</tr>
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<tr>
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<th colspan="2">
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</th>
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</tr>
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<tr>
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<td>Now issue a "Close Turnout 9" command</td>
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<td><code>[b0 8 30 77]</code> Requesting Switch at 9 to Closed (output On)<br>
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<code>[b0 8 20 67]</code> Requesting Switch at 9 to Closed (output Off)</td>
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</tr>
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<tr>
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<td>Turnout starts to move, opens Aux A</td>
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<td><code>[b1 8 40 6]</code> Turnout 9 Aux input is Thrown (input on)</td>
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</tr>
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<tr>
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<td>Moving turnout closes Switch A and reaches the end of its travel.</td>
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<td><code>[b1 8 70 36]</code> Turnout 9 Switch input is Closed (input off)</td>
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</tr>
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</table>
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<h1>Programming the DS54</h1>
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<p>The DS54 CV values can be programmed via JMRI using the DecoderPro programming tools using the
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"Service Mode" programming track. This requires a JMRI connection to a command station, and
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the DS54's track inputs must be connected to the programming track. As described in the DS54
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documentation, it is necessary to connect a 100 Ohm 2 Watt resistor between one of the
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programming track rails and the "Yellow" input wire of one of the DS54's output connectors.
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It is also necessary to disconnect all other input signal sources.</p>
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<p>Once the connections described above have been made, place the programming jumper across
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the programming jumper pins and open the JMRI Roster "Service-Mode Programmer" tool.<br>
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Navigate to the "Digitrax" entry, and select DS54 as the decoder type, and press the
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"Open Programmer" button. You may then read and write the CVs just like any mobile decoder.</p>
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<p>When ready to place the DS54 back in normal service, disconnect the programming track
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connections and programming resistor, and be sure to remove the programming jumper.</p>
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<h1>DS54 Wiring</h1>
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<p>It is strongly recommended that when multiple DS54s are used, that they be connected to
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the track wires with consistent phasing. In other words, all DS54 devices should connect the
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RailA connection to the same terminal position on the DS54, and that all DS54s connect the
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RailB connection to the <em>other</em> terminal position. This is important to ensure that
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there is not an unexpected current flow on the LocoNet cable due to out-of-phase connections
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on the DS54 track connections. Note that this means that the DS54 track connections should
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<em>not</em> be made using track power that is from an <em>autoreversing</em> power
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district.</p>
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<p>Technical details on this issue can be found in <a href="DigitraxPower.shtml">a discussion
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of power leads on Digitrax components</a>.</p>
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<p>LocoNet® is a registered trademark of <a href="https://www.digitrax.com">Digitrax,
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Inc.</a></p>
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