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   Should I Use Null Modem or Straight Through Serial Cables? - National Instruments
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            }</script><link rel="SHORTCUT ICON"href=/resource/1592230841000/favicon><body><div class=ni-page-wrap><div class=ni-page-wrap><div id=ni-vis-head><div class="global-header skeleton"><div class="ni-wrapper-header noindex"><nav class="header-skinny navbar navbar-default"><div class=container-fluid><div class=row><div class="ni_logo col-md-5 col-xs-4"><a class="navbar-brand analytics-utilitylogo-link"href=//www.ni.com/> </a></div></div></div></nav></div></div></div><div aria-label=Breadcrumbs class=breadcrumb role=navigation><div class="ni-body-copy-secondary container"><a class=left href=https://www.ni.com/> Home </a><span class=delimiter> </span><a class=left href=https://www.ni.com/support> Support </a><span class=delimiter> </span><span class="left breadcrumb-last"> Should I Use Null Modem or Straight Through Serial Cables? </span></div></div><div style="overflow-x: hidden;"><div class=row><div class="col-xs-12 col-sm-12 col-md-12"><form action=/KnowledgeArticleDetails?id=kA00Z000000P9w0SAC id=j_id0:j_id1:j_id24 method=post name=j_id0:j_id1:j_id24><input name=j_id0:j_id1:j_id24 type=hidden value=j_id0:j_id1:j_id24><div class=container><div class=row><div class="col-xs-12 col-sm-12 col-md-12"><div class=blog-header><h1 class=blog-title>Should I Use Null Modem or Straight Through Serial Cables?</h1><div class="blog-description lead"><span class=lastModifiedDate> Updated Feb 24, 2020 </span></div><div class=blog-icons><ul class=list-unstyled><li><div class=icon onclick=location.href='mailto:user@example.com?subject='+document.title+'&body='+window.location.href;><i class="fa fa-envelope"> </i></div><li><div class=icon onclick=window.print();><i class="fa fa-print"> </i></div></ul></div></div><div class=blog-reported><span style="display: none;"id=j_id0:j_id1:j_id24:j_id36> </span><h2>Reported In</h2><div class=blog-reported-popover data-trigger=manual><div class=dot></div><svg data-name="Layer 1"viewbox="0 0 128 128"id=Layer_1 xmlns=http://www.w3.org/2000/svg><defs><style>.cls-1 {
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                                                    }</style></defs><path class=cls-1 d=M64,0a64,64,0,1,0,64,64A64,64,0,0,0,64,0ZM75.61,93.41q-4.36,1.69-7,2.57a18.73,18.73,0,0,1-6,.89c-3.52,0-6.26-.84-8.22-2.53a8.09,8.09,0,0,1-2.93-6.41,21,21,0,0,1,.22-3.09,34.68,34.68,0,0,1,.71-3.56L56,68.65q.5-1.82.83-3.44a15,15,0,0,0,.33-3,4.5,4.5,0,0,0-1-3.37c-.68-.63-2-.95-3.89-.95a10.31,10.31,0,0,0-2.9.43c-1,.29-1.83.56-2.54.82l1-3.89c2.39-.95,4.66-1.76,6.84-2.44a20.91,20.91,0,0,1,6.18-1c3.5,0,6.2.83,8.09,2.48a8.17,8.17,0,0,1,2.84,6.46c0,.55-.06,1.51-.19,2.89a19.92,19.92,0,0,1-.72,3.8L67.21,80.06c-.29,1-.55,2.16-.79,3.46a17.73,17.73,0,0,0-.36,2.94c0,1.67.38,2.81,1.15,3.41a6.52,6.52,0,0,0,4,.91,11.57,11.57,0,0,0,3-.45,16.72,16.72,0,0,0,2.42-.8ZM75,42.36a8.74,8.74,0,0,1-6.1,2.31,8.83,8.83,0,0,1-6.13-2.31,7.42,7.42,0,0,1,0-11.21,8.79,8.79,0,0,1,6.13-2.33A8.69,8.69,0,0,1,75,31.15a7.45,7.45,0,0,1,0,11.21Z></path><script></script></svg></div><div class="popover-content hidden"><span style="display: none;"id=j_id0:j_id1:j_id24:j_id43> </span><div class=popover-body>Reported In shows products that are verified to work for the solution described in this article. This solution might also apply to other similar products or applications.</div></div></div><div class=blog-reported-data><div class=row><div class="col-xs-12 col-sm-6 col-md-3"><h3>Hardware</h3><ul><li>Serial Cable</ul></div></div><div class=row></div><div class=row></div></div><span id=j_id0:j_id1:j_id24:j_id72:0:j_id73> <div class=blog-post><h2>Issue Details</h2> I want to connect my serial instrument to my computer’s built-in serial port or to an NI serial interface device. Should I use a null modem or straight through serial cable? </div> </span><span id=j_id0:j_id1:j_id24:j_id72:1:j_id73> <div class=blog-post><h2>Solution</h2> The type of cable you should use depends on whether the device you are interfacing with is a <a href=https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000015ARaSAM&l=en-US target=_blank> Data Terminal Equipment (DTE) or Data Communications Equipment (DCE) device </a> .  <br>   <h3>Data Terminal Equipment Device</h3> The null modem cable (crossover cable) should be used when interfacing between a serial port and a DTE device.  <br><br> With null modem cables, the transmitting device's Transmit (TX) signal is routed to the receiving device's Receive (RX) line. Similarly, the receiving device's transmission line is routed to the communicating device's receiving line. The effect of the terminal crossover is to simulate a DCE device at either end of the cable. This allows each DTE device to communicate with the other as if it is communicating with a DCE device. Here are two common null modem cable routes:  <br>   <div style="text-align: center;"><b> Simple Null Modem Cable Route </b></div><div style="text-align: center;"> </div><div style="text-align: center;"><img style="width: 543px;height: 206px;"alt src=/servlet/rtaImage?eid=ka03q000001261d&feoid=00N0Z00000HEWRt&refid=0EM3q00000178s9></div><br> To enable handshaking between the two devices, the Request to Send (RTS) pin of one device must be connected to the Clear to Send (CTS) pin of the other device.  <br>   <div style="text-align: center;"><b> Null Modem Cable with Handshaking Route </b><br><img style="width: 543px;height: 206px;"alt src=/servlet/rtaImage?eid=ka03q000001261d&feoid=00N0Z00000HEWRt&refid=0EM3q00000178sc><br>  </div><h3>Data Communications Equipment Device</h3> The straight through cable should be used when interfacing with a Data Communications Equipment (DCE) device.  The TX-RX and RTS-CTS pins are not cross-connected in this case, hence the term straight through cable. <br>   <div style="text-align: center;"><b> Simple Straight Through Cable Route </b><br><img style="width: 554px;height: 210px;"alt src=/servlet/rtaImage?eid=ka03q000001261d&feoid=00N0Z00000HEWRt&refid=0EM3q00000178tL></div><div style="left: 300.227px;top: 272.227px;"> </div><div style="left: 276.227px;top: 927.727px;"> </div><div style="left: 283.727px;top: 927.727px;"> </div></div> </span><span id=j_id0:j_id1:j_id24:j_id72:2:j_id73> <div class=blog-post><h2>Additional Information</h2> To tell if your NI serial cable is null modem or straight though, search for its part number in <a href=http://www.ni.com/pdf/manuals/373170f.pdf#page=12 target=_blank> NI Serial Hardware Specifications and Features </a> and note the cable type in the description. Alternatively, you can use a handheld DMM to test continuity on the individual pins of your serial cable. If every pin is electrically connected to the corresponding pin on the other end, i.e.: pin 1 to pin1, pin 2 to pin 2, etc. then the cable is straight through.</div> </span></div></div></div><div class=divider></div><div class=container><div class=row><div class="col-xs-12 col-sm-12 col-md-12"><div class=relatedArticles><div class=row><div class="col-xs-12 col-sm-6 col-md-6"><span id=j_id0:j_id1:j_id24:j_id85:0:j_id86> <div class=blog-post><h2>Related Links</h2><ul><li><a href=http://www.ni.com/tutorial/2897/en/ target=_blank> Serial Instrument Control Tutorial </a><li><a href=http://www.ni.com/tutorial/3450/en/ target=_blank> How to Perform a Serial Loopback Test </a></ul></div> </span></div><div class="col-xs-12 col-sm-6 col-md-6"><h2>Other Support Options</h2><h3>Ask the NI Community</h3><p>Collaborate with other users in our discussion forums<ul><li class=other-support-options-li type=square><a href=https://forums.ni.com/> Search the NI Community for a solution 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