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Commands to DLT645 protocol English Version. DLT645 1997 - 2007
dlt645.rar
  • dlt645protocolenglishversion-141110213607-conversion-gate01 (1).pdf
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<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/62550d42b744eb386fd7d5f8/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/62550d42b744eb386fd7d5f8/bg1.jpg"><div class="c x0 y1 w0 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">Multi-function watt-hour meter communication protocol DL/T 645-1997</div><div class="t m0 x2 h3 y3 ff1 fs0 fc0 sc0 ls0 ws0">1. Range</div><div class="t m0 x2 h3 y4 ff1 fs0 fc0 sc0 ls0 ws0">The standardization is used for the tariff device of multi-function watt-hour meter to do point to </div><div class="t m0 x2 h3 y5 ff1 fs0 fc0 sc0 ls0 ws0">point or one master to multi-slaves data exchange with hand-held unit(HHU) or other data ter<span class="_ _0"></span>minal </div><div class="t m0 x2 h3 y6 ff1 fs0 fc0 sc0 ls0 ws0">equipments. It defines the technical specification of ph<span class="_ _0"></span>ysical connection, communication link and </div><div class="t m0 x2 h3 y7 ff1 fs0 fc0 sc0 ls0 ws0">application.</div><div class="t m0 x2 h3 y8 ff1 fs0 fc0 sc0 ls0 ws0">4 Physical layer</div><div class="t m0 x2 h3 y9 ff1 fs0 fc0 sc0 ls0 ws0">&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.</div><div class="t m0 x2 h3 ya ff1 fs0 fc0 sc0 ls0 ws0">4.1.6 Electrical characteristics of reading head</div><div class="t m0 x3 h3 yb ff1 fs0 fc0 sc0 ls0 ws0">The reading head should be able to do data exchange with data terminal equipment.<span class="_ _0"></span> Its </div><div class="t m0 x3 h3 yc ff1 fs0 fc0 sc0 ls0 ws0">communication interface is TTL<span class="_ _1"></span> level, or according to ITU-TV<span class="_ _2"></span>.24 and ITU-TV<span class="_ _2"></span>.28. <span class="_ _1"></span>The </div><div class="t m0 x3 h3 yd ff1 fs0 fc0 sc0 ls0 ws0">electrical characteristics of reading head are<span class="_ _0"></span> shown in fig.4.</div><div class="t m0 x2 h3 ye ff1 fs0 fc0 sc0 ls0 ws0">4.1.6.1 W<span class="_ _3"></span>orking limit of reading head</div><div class="t m0 x3 h3 yf ff1 fs0 fc0 sc0 ls0 ws0">Signal level </div><div class="t m0 x3 h3 y10 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x4 h3 y11 ff1 fs0 fc0 sc0 ls0 ws0"> OFF status <span class="_ _4"> </span>ON status</div><div class="t m0 x4 h3 y12 ff1 fs0 fc0 sc0 ls0 ws0">Binary &#8220;1&#8221;<span class="_ _5"> </span>Binary &#8220;0&#8221;</div><div class="t m0 x4 h3 y13 ff1 fs0 fc0 sc0 ls0 ws0">MARK<span class="_ _6"> </span>SP<span class="_ _3"></span>ACE</div><div class="t m0 x4 h3 y14 ff1 fs0 fc0 sc0 ls0 ws0">Switch off li<span class="_ _1"></span>ght<span class="_ _0"></span> source<span class="_ _7"> </span>Switch on light source</div><div class="t m0 x4 h3 y15 ff1 fs0 fc0 sc0 ls0 ws0">&lt;-3V(V<span class="_ _2"></span>.28)<span class="_ _8"> </span>&gt;+3V(V<span class="_ _2"></span>.28)</div><div class="t m0 x4 h3 y16 ff1 fs0 fc0 sc0 ls0 ws0">&lt;=0.8V(TTL<span class="_ _1"></span> input)<span class="_ _9"> </span>&gt;=2V(TTL<span class="_ _1"></span> input)</div><div class="t m0 x4 h3 y17 ff1 fs0 fc0 sc0 ls0 ws0">-0.5V~0.4V(TTL<span class="_ _1"></span> output)<span class="_ _a"> </span>2.4V~Up(TTL<span class="_ _1"></span> output)</div><div class="t m0 x3 h3 y18 ff1 fs0 fc0 sc0 ls0 ws0">Note: TTL<span class="_ _1"></span> negative logic is used here.</div><div class="t m0 x2 h3 y19 ff1 fs0 fc0 sc0 ls0 ws0">4.1.6.2 T<span class="_ _1"></span>ransfer speed</div><div class="t m0 x5 h3 y1a ff1 fs0 fc0 sc0 ls0 ws0">Max transfer speed should be no lower than 2400bps.</div><div class="t m0 x2 h3 y1b ff1 fs0 fc0 sc0 ls0 ws0">4.1.7 Power supply for working</div><div class="t m0 x5 h3 y1c ff1 fs0 fc0 sc0 ls0 ws0">The power supply of reading head is provided by hand-held unit or other data<span class="_ _0"></span> terminal </div><div class="t m0 x5 h3 y1d ff1 fs0 fc0 sc0 ls0 ws0">equipment connected with it.</div></div><div class="t m0 x5 h3 y1e ff1 fs0 fc0 sc0 ls0 ws0">a)</div><div class="t m0 x6 h3 y1f ff1 fs0 fc0 sc0 ls0 ws0"> 0 1 0 1</div><div class="t m0 x5 h3 y20 ff1 fs0 fc0 sc0 ls0 ws0">(b)</div><div class="t m0 x7 h3 y21 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="c x8 y21 w2 h4"><div class="t m1 x0 h5 y22 ff1 fs1 fc0 sc0 ls0 ws0"><span class="fc1 sc0"> </span></div></div><div class="t m0 x5 h3 y23 ff1 fs0 fc0 sc0 ls0 ws0"> ON 0 1 0 1</div><div class="t m0 x9 h3 y24 ff1 fs0 fc0 sc0 ls0 ws0">Fig.5 signal and modulation</div><div class="t m0 x5 h3 y25 ff1 fs0 fc0 sc0 ls0 ws0">a)<span class="_ _b"> </span>electrical signal with no modulation b)infrared light signal after<span class="_ _0"></span> modulation</div><div class="c x0 y1 w0 h2"><div class="t m0 xa h3 y26 ff1 fs0 fc0 sc0 ls0 ws0">Fig.6 angle of light radiation</div></div><div class="t m0 xb h6 y27 ff2 fs1 fc0 sc0 ls0 ws0">OFF</div><div class="t m0 xc h7 y28 ff3 fs0 fc0 sc0 ls0 ws0">&#952;</div></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div> </body> </html>
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