DSC-200/300
¥1.00
AB7000-C
¥1.00
SINEAX V604 604-112
¥1.00
XVME-976
¥1.00
XVME-674
¥1.00
SBA-515
¥1.00
SYSTEME LAUER PCS 810-1
其方法主要是利用MODEM分别与PC及PLC连接后，在PC上运行SSS或CPT软件，从而实现远程监察院控与程序调试的功能。而MODEM的连接方式又分为拨号连接与专线连接两种方式。以下描述了在专线连接方式下实现该功能的方法。
专线连接
所谓专线连接，即两台MODEM之间不通过PSTN公共电话交换网进行通讯，而是用一根2芯或4芯的普通电话线将两台MODEM直接相连，以达到通讯的目的。 这种方式在上位监控计算机与PLC之间距离较远，而现场又不具备与PSTN电话网相连的情况下极为有用。
一般情况下，普通电话到电话局交换机的距离为1KM以内，故用专线连接在1KM内应没有问题。具体适用距离用户需在应用中实践测试。
专线连接的硬件要求以及接线与拨号连接基本相应，包括MODEM、计算机、PLC的参数设置也与上述方式一样，下面只说明专线连接与拨号连接不同的地方。
厦门岳航计算机工程有限公司
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