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<h3><span lang=EN-US>IEC/IEEE Bus Interface </span></h3>

<p class=Normal><span lang=EN-US>The standard instrument is equipped with 
 a GPIB bus (IEC/IEEE bus) connection. The two interface connectors labeled 
 </span><span lang=EN-US
				style="font-style: italic;"><I>IEC BUS</I></span><span lang=EN-US> 
 and </span><span lang=EN-US
					style="font-style: italic;"><I>IEC SYSTEM BUS</I></span><span 
 lang=EN-US> are located on the rear panel of the instrument. </span></p>

<ul type="disc" class="whs1">
	
	<li class=kadov-p-CList><p class=List><span lang=EN-US>The </span><span 
 lang=EN-US
	style="font-style: italic;"><I>IEC BUS</I></span><span lang=EN-US> connector 
 is intended for remote control of the analyzer from a controller. </span></p></li>
	
	<li class=kadov-p-CList><p class=List><span lang=EN-US>The </span><span 
 lang=EN-US
	style="font-style: italic;"><I>IEC SYSTEM BUS</I></span><span lang=EN-US> 
 can be used to control further devices from the analyzer. </span></p></li>
</ul>

<p class=Note><img src="../small_images/note.jpg" x-maintain-ratio="TRUE" width="36px" height="37px" border="0" class="img_whs2">Always use a shielded cable to connect the 
 GPIB bus interfaces. </p>

<table x-use-null-cells cellspacing="0" class="whs3">
<col class="whs4">
<col class="whs5">

<tr valign="top" class="whs6">
<td width="45px" class="whs7">
<p><span lang=EN-US><img src="../small_images/info_red.jpg" x-maintain-ratio="TRUE" width="32px" height="37px" border="0" class="img_whs8"></span></td>
<td width="679px" class="whs9">
<p><span lang=EN-US><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a1" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Characteristics 
 of the interface</a><script type="text/javascript"
												language=JavaScript1.2><!--
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//--></script></span></p>
<div class="droptext" id="POPUP158915113" style="display: 'none'; " x-ss-type="dropdown">
 <ul type="disc" class="whs1">
  <li class=kadov-p-CList>
  <p class=List><span lang=EN-US>8-it parallel 
 data transfer</span></p></li>
  <li class=kadov-p-CList>
  <p class=List><span lang=EN-US>Bidirectional 
 data transfer</span></p></li>
  <li class=kadov-p-CList>
  <p class=List><span lang=EN-US>Three-line handshake</span></p></li>
  <li class=kadov-p-CList>
  <p class=List><span lang=EN-US>High data transfer 
 rate of max. 1&nbsp;MByte/s </span><span lang=EN-US
											style="color: #ff0000;"><font color=red >check 
 ZVAB</font></span></p></li>
  <li class=kadov-p-CList>
  <p class=List><span lang=EN-US>Up to 15 devices 
 can be connected</span></p></li>
  <li class=kadov-p-CList>
  <p class=List><span lang=EN-US>Maximum length 
 of the connecting cables 15 m. The length of a single connecting cable 
 should not exceed 2 m, if many devices are used, it should not exceed 
 1 m.</span></p></li>
  <li class=kadov-p-CList>
  <p class=List><span lang=EN-US>Wired OR if 
 several instruments are connected in parallel</span></p></li>
 </ul>
</div>
<p class=Dropdownline><span lang=EN-US><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a2" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Pin 
 assignment</a><script type="text/javascript"
											language=JavaScript1.2><!--
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//--></script></span></p>
<div class="droptext" id="POPUP159696708" style="display: 'none'; " x-ss-type="dropdown">
 <p><span lang=EN-US><img src="GPIB.gif" v:shapes="_x0000_i1025" width="304px" height="236px" border="0" class="img_whs10"></span></p>
</div>
<p class=Dropdownline><span lang=EN-US><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a14" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Bus 
 lines</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('a14');
//--></script></span>
<div class="droptext" id="POPUP158783878" style="display: 'none'; " x-ss-type="dropdown">
 <p><b><span lang=EN-US>1. Data bus with 8 lines <a class="expandspot" href="javascript:kadovTextPopup(this)" id="a3" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">D0 
 to D7</a><span class=expandtext style="display: 'none';" id=POPUP160822717 ><span lang=EN-US>The transmission is bit-parallel and byte-serial in 
 the ASCII/ISO code. D0 is the least significant bit, D7 the most significant 
 bit. </span></span></span></b></p>
 <p class=Normal
	style="margin-left: 25.2pt; text-indent: -25.2pt;"><b><span lang=EN-US>2. 
 Control bus with <a class="dropspot" href="javascript:kadovTextPopup(this)" id="a4" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">five 
 lines</a></b>&nbsp;</span></p>
 <div class="droptext" id="POPUP215909039" style="display: 'none'; " x-ss-type="dropdown">
  <p class=Normal><b><span lang=EN-US><a class="expandspot" href="javascript:kadovTextPopup(this)" id="a6" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">IFC 
 </b>(Interface Clear):</a><span class=expandtext style="display: 'none';" id=POPUP216445910 ><span lang=EN-US>active LOW resets the interfaces of the instruments 
 connected to the default setting.</span></span></span></p>
  <p class=Normal><b><span lang=EN-US><a class="expandspot" href="javascript:kadovTextPopup(this)" id="a7" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">ATN 
 </b>(Attention):</a><span class=expandtext style="display: 'none';" id=POPUP217107548 ><span lang=EN-US>active LOW signals the transmission of interface messages, 
 inactive HIGH signals the transmission of device messages.</span></span></span></p>
  <p class=Normal><b><span lang=EN-US><a class="expandspot" href="javascript:kadovTextPopup(this)" id="a8" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">SRQ 
 </b>(Service Request):</a><span class=expandtext style="display: 'none';" id=POPUP215128678 ><span lang=EN-US>active LOW enables the connected device to send a service 
 request to the controller.</span></span></span></p>
  <p class=Normal><b><span lang=EN-US><a class="expandspot" href="javascript:kadovTextPopup(this)" id="a9" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">REN 
 </b>(Remote Enable):</a><span class=expandtext style="display: 'none';" id=POPUP160815798 ><span lang=EN-US>active LOW permits switchover to remote control.</span></span></span></p>
  <p class=Normal><b><span lang=EN-US><a class="expandspot" href="javascript:kadovTextPopup(this)" id="a10" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">EOI 
 </b>(End or Identify):</a><span class=expandtext style="display: 'none';" id=POPUP216121405 ><span lang=EN-US>has two functions in connection with ATN:</span><span 
 lang=EN-US><br>ATN=HIGH active LOW marks the end of data transmission.</span><span lang=EN-US><br>ATN=LOW&nbsp;active LOW triggers a parallel poll.</span></span></span></p>
 </div>
 <p class=Normal><span lang=EN-US><b>3</b></span><span lang=EN-US><b>.Handshake 
 bus with <a class="dropspot" href="javascript:kadovTextPopup(this)" id="a5" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">three 
 lines</a></b></span></p>
 <div class="droptext" id="POPUP160487400" style="display: 'none'; " x-ss-type="dropdown">
  <p class=Normal><span lang=EN-US><b><a class="expandspot" href="javascript:kadovTextPopup(this)" id="a11" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">DAV 
 </b>(Data Valid):</a><span class=expandtext style="display: 'none';" id=POPUP160823352 ><span lang=EN-US>active LOW signals a valid data byte on the data bus.</span></span></span></p>
  <p class=Normal><b><span lang=EN-US><a class="expandspot" href="javascript:kadovTextPopup(this)" id="a12" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">NRFD 
 </b>(Not Ready For Data):</a><span class=expandtext style="display: 'none';" id=POPUP215110341 ><span lang=EN-US>active LOW signals that one of the connected devices 
 is not ready for data transfer.</span></span></span></p>
  <p class=Normal><b><span lang=EN-US><a class="expandspot" href="javascript:kadovTextPopup(this)" id="a13" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">NDAC 
 </b>(Not Data Accepted):</a><span class=expandtext style="display: 'none';" id=POPUP217115779 ><span lang=EN-US>active LOW signals that the instrument connected is 
 accepting the data on the data bus.</span></span></span></p>
 </div>
</div></td></tr>
</table>

<p>The analyzer provides the following functions to communicate via GPIB 
 bus:</p>

<ul type="disc" class="whs1">
	
	<li class=kadov-p-CList><p class=List><a href="GPIB_Bus_Interface.htm#Interface_Functions"
											id=A16
											style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Interface 
 functions</a><script type="text/javascript"
											language=JavaScript1.2><!--
kadovInitEffects('A16');
//--></script></p></li>
	
	<li class=kadov-p-CList><p class=List><a href="GPIB_Bus_Interface.htm#Interface_Messages"
											id=A17
											style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Interface 
 messages</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('A17');
//--></script></p></li>
	
	<li class=kadov-p-CList><p class=List><a href="GPIB_Bus_Interface.htm#Instrument_Messages"
											id=A18
											style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Instrument 
 messages</a><script type="text/javascript"
										language=JavaScript1.2><!--
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//--></script></p></li>
</ul>


<hr align="center" width="50%" class="whs11">


<h4><span lang=EN-US><a name=Interface_Functions></a>Interface Functions</span></h4>

<p>Instruments which can be controlled via GPIB bus can be equipped with 
 different interface functions. The interface function for the network 
 analyzer are listed in the following table. </p>

<table class=NormalTable
		x-use-null-cells
		style="margin-left: 3.4pt;
				border-collapse: collapse;
				border-spacing: 0px;
				border-spacing: 0px;"
		cellspacing=0>
<col>
<col>

<tr class="whs12">
<td valign="top" class="whs13">
<p class=Tabcmu1>Control character</td>
<td valign="top" class="whs14">
<p class=Tabcmu1>Interface function</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>SH1</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Handshake source function (source handshake), full capability</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>AH1</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Handshake sink function (acceptor handshake), full capability</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>L4</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Listener function, full capability, de-addressed by MTA.</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>T6</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Talker function, full capability, ability to respond to 
 serial poll, deaddressed by MLA</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>SR1</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Service request function (Service Request), full capability</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>PP1</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Parallel poll function, full capability</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>RL1</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Remote/Local switch over function, full capability</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>DC1</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Reset function (Device Clear), full capability</td></tr>

<tr class="whs12">
<td valign="top" class="whs17">
<p class=Tabcmu2>DT1</td>
<td valign="top" class="whs18">
<p class=Tabcmu2>Trigger function (Device Trigger), full capability</td></tr>
</table>


<hr align="center" width="50%" class="whs11">


<h4><span lang=EN-US><a name=Interface_Messages></a>Interface Messages</span></h4>

<p class=Normal><span lang=EN-US>Interface messages are transmitted to 
 the instrument on the data lines, with the attention line being active 
 (LOW). They serve to communicate between controller and instrument.</span></p>

<p class=Normal><b style="font-weight: bold;"><span lang=EN-US>Universal 
 Commands</span></b></p>

<p class=Normal><span lang=EN-US>Universal&nbsp;commands&nbsp;are encoded 
 in the range 10 through 1F hex. They are effective for all instruments 
 connected to the bus without pervious addressing.</span></p>

<table class=NormalTable
		x-use-null-cells
		style="margin-left: 3.4pt;
				border-collapse: collapse;
				border-spacing: 0px;
				border-spacing: 0px;"
		cellspacing=0>
<col>
<col>
<col>

<tr class="whs12">
<td valign="top" class="whs13">
<p class=Tabcmu1>Command</td>
<td valign="top" class="whs19">
<p class=Tabcmu1><span lang=EN-US>QuickBASIC</span><span lang=EN-US> command</span></td>
<td valign="top" class="whs14">
<p class=Tabcmu1>Effect on the instrument</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>DCL<br>
(Device Clear)</td>
<td valign="top" class="whs20">
<p class=Tabcmu2>IBCMD (controller%, CHR$(20))</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Aborts the processing of the commands just received and 
 sets the command processing software to a defined initial state. Does 
 not change the instrument settings.</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>IFC<br>
(Interface Clear)</td>
<td valign="top" class="whs20">
<p class=Tabcmu2>IBSIC (controller%)</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Resets the interfaces to the default setting.</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>LLO<br>
(Local Lockout)</td>
<td valign="top" class="whs20">
<p class=Tabcmu2>IBCMD (controller%, CHR$(17))</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>The LOC/IEC ADDR key is disabled.</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>SPE<br>
(Serial Poll Enable)</td>
<td valign="top" class="whs20">
<p class=Tabcmu2>IBCMD (controller%, CHR$(24))</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Ready for serial poll.</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>SPD<br>
(Serial Poll Disable)</td>
<td valign="top" class="whs20">
<p class=Tabcmu2>IBCMD (controller%, CHR$(25))</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>End of serial poll.</td></tr>

<tr class="whs12">
<td valign="top" class="whs17">
<p class=Tabcmu2>PPU&nbsp;<br>
(Parallel Poll Unconfigure)</td>
<td valign="top" class="whs21">
<p class=Tabcmu2>IBCMD (controller%, CHR$(21))</td>
<td valign="top" class="whs18">
<p class=Tabcmu2>End of the parallel-poll state. </td></tr>
</table>

<p class=Normal>&nbsp;</p>

<p class=Normal><b style="font-weight: bold;"><span lang=EN-US>Addressed 
 Commands</span></b></p>

<p class=Normal><span lang=EN-US>Addressed commands are encoded in the 
 range 00 through 0F hex. They are only effective for instruments addressed 
 as listeners.</span></p>

<table class=NormalTable
		x-use-null-cells
		style="margin-left: 3.4pt;
				border-collapse: collapse;
				border-spacing: 0px;
				border-spacing: 0px;"
		cellspacing=0>
<col>
<col>
<col>

<tr class="whs12">
<td valign="top" class="whs13">
<p class=Tabcmu1>Command</td>
<td valign="top" class="whs19">
<p class=Tabcmu1><span lang=EN-US>QuickBASIC</span><span lang=EN-US> command</span></td>
<td valign="top" class="whs14">
<p class=Tabcmu1>Effect on the instrument</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>GET<br>
(Group Execute Trigger)</td>
<td valign="top" class="whs20">
<p class=Tabcmu2>IBTRG (device%)</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Triggers a previously active device function (e.g. a sweep). 
 The effect of the command is the same as with that of a pulse at the external 
 trigger signal input.</td></tr>

<tr class="whs12">
<td valign="top" class="whs15">
<p class=Tabcmu2>GTL<br>
(Go to Local)</td>
<td valign="top" class="whs20">
<p class=Tabcmu2>IBLOC (device%)</td>
<td valign="top" class="whs16">
<p class=Tabcmu2>Transition to the &quot;Local&quot; state (manual control).</td></tr>

<tr class="whs12">
<td colspan="1" rowspan="1" valign="top" class="whs17">
<p class=Tabcmu2>PPC<br>
(Parallel Poll Configure)</td>
<td colspan="1" rowspan="1" valign="top" class="whs21">
<p class=Tabcmu2>IBPPC (device%, data%)</td>
<td colspan="1" rowspan="1" valign="top" class="whs18">
<p class=Tabcmu2>Configures the instrument for parallel poll. Additionally, 
 the QuickBASIC command executes PPE/PPD.</td></tr>

<tr class="whs12">
<td valign="top" class="whs17">
<p class=Tabcmu2>SDC<br>
(Selected Device Clear)</td>
<td valign="top" class="whs21">
<p class=Tabcmu2>IBCLR (device%)</td>
<td valign="top" class="whs18">
<p class=Tabcmu2>Aborts the processing of the commands just received and 
 sets the command processing software to a defined initial state. Does 
 not change the instrument setting.</td></tr>
</table>

<p class=Normal>&nbsp;</p>


<hr align="center" width="50%" class="whs11">


<h3><span lang=EN-US><a name=Instrument_Messages></a>Instrument Messages</span></h3>

<p class=Normal><span lang=EN-US>Instrument messages (commands) are transferred 
 on the data lines of the GPIB bus while the </span><span lang=EN-US
															style="font-style: italic;"><I>ATN 
 </I></span><span lang=EN-US>line is not active. ASCII code is used.</span></p>

<p class=Normal><span lang=EN-US>Structure and syntax of the instrument 
 messages are described the <a HREF="../SCPI_Reference/About_this_Chapter.htm"
								id=A19
								style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">SCPI 
 Reference</a><script type="text/javascript"
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 chapter. The chapter also provides a detailed description of all messages 
 implemented by the analyzers. &nbsp;</span></p>

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