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标题: 问个问题 [打印本页]

作者: didimdol 时间: 2009-11-16 10:38
标题: 问个问题
有没有专用的485通讯线，大家通常都用哪种线？

作者: nbsun 时间: 2009-11-16 14:20
屏蔽双绞线
 
RVSP 2*0.2以上吧

作者: Terry008 时间: 2009-11-16 15:50
用线建议标准：

<table style="WIDTH: 249pt; BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="331" border="0" x:str>
<colgroup>
<col style="WIDTH: 25pt; mso-width-source: userset; mso-width-alt: 1056" width="33">
<col style="WIDTH: 112pt; mso-width-source: userset; mso-width-alt: 4768" span="2" width="149">
<tbody>
<tr style="HEIGHT: 14.1pt; mso-height-source: userset" height="18">
<td class="xl92" style="WIDTH: 25pt; HEIGHT: 14.1pt" width="33" height="18" x:num="1">1</td>
<td class="xl91" width="149" medium? none; WIDTH: 112pt?>读卡器连接线</td>
<td class="xl90" width="149" medium? none; WIDTH: 112pt?>RVVP6*0.5</td></tr>
<tr style="HEIGHT: 14.1pt; mso-height-source: userset" height="18">
<td class="xl92" style="WIDTH: 25pt; HEIGHT: 14.1pt" width="33" height="18" x:num="2" medium? none?>2 </td>
<td class="xl91" width="149" medium? none; WIDTH: none? 112pt; BORDER-TOP: medium="medium">电锁及门磁连接线</td>
<td class="xl90" width="149" medium? none; WIDTH: none? 112pt; BORDER-TOP: medium="medium">RVVP4*0.5</td></tr>
<tr style="HEIGHT: 14.1pt; mso-height-source: userset" height="18">
<td class="xl92" style="WIDTH: 25pt; HEIGHT: 14.1pt" width="33" height="18" x:num="3" medium? none?>3 </td>
<td class="xl91" width="149" medium? none; WIDTH: none? 112pt; BORDER-TOP: medium="medium">出门按钮连接线</td>
<td class="xl90" width="149" medium? none; WIDTH: none? 112pt; BORDER-TOP: medium="medium">RVVP2*0.5</td></tr>
<tr style="HEIGHT: 14.1pt; mso-height-source: userset" height="18">
<td class="xl92" style="WIDTH: 25pt; HEIGHT: 14.1pt" width="33" height="18" x:num="4" medium? none?>4 </td>
<td class="xl91" width="149" medium? none; WIDTH: none? 112pt; BORDER-TOP: medium="medium">RS485通讯总线</td>
<td class="xl90" width="149" medium? none; WIDTH: none? 112pt; BORDER-TOP: medium="medium">RVVP4*0.5</td></tr></tbody></table>
 
当距离较远时，建议用RVVSP双绞屏蔽线代替RVVP使用，线径可适当增粗一点。

[此贴子已经被作者于2010-9-23 14:49:12编辑过]

作者: 沉思的海岸 时间: 2010-3-8 15:07
了解了

作者: yuanqiulin 时间: 2010-3-21 23:18
学习

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