自动门
门禁系统网络化依然炙热 搭配是最佳组合
发布时间:2012/7/25

网络化作为当前行业的主流发展趋势,TCP/IP网络已被广泛应用,采用TCP/IP通讯协议,通过LAN/WAN/Internet构建系统网络,实现跨楼层、跨建筑、跨城市的远程联网控制及数据传输,对门禁系统来说已成为事实。

  TCP/IP控制器的优点在于采用国际标准的流行通讯协议,先进性和性能都比较好,组网数量理论上是无限制,组网范围广,可以跨地区,甚至跨国界,通讯速度快,适合大型系统;通讯质量稳定,抗干扰能力较RS485方式更强。如果用户已经有局域网则可以利用现有网络进行组网。在增加点位时,可以利用就近方便地接入到已存在的网络系统中。其缺点是就当前市场来看,其设备成本会明显高于RS485的方式。如果是跨地域的大型系统,网络管理和网络安全也会成为新的问题而需要着重关注。但就大型门禁系统而言,TCP/IP的组网方式相较于RS485组网方式的优势仍非常明显:节省了大量的敷线工程量、高速通信有助于系统信息交互,有利于对整个系统的管理,方便于系统的调试和故障排除,使系统具有极大的灵活性,很方便系统扩容。


  可清晰可到,绝大多数主流厂商都选择了主架构是TCP/IP、从架构是RS485的方式,或这是最佳的组合架构。这是基于如下考虑的:说TCP/IP网可无限扩展这话不假,但单台网络门禁设备也受制于到最近网络交换机的距离限制,要求不超过90米,这相较于RS485的千米距离却显得很短,TCP/IP组网的优势是跨建筑、跨地域、跨子系统间的组网,以及大容量信息交互和对实时性有高要求的应用;而RS485方式很适合于小规模施展拳脚的场合,或对信息传输不太多的应用,其作为TCP/IP方式的补充是最合适的。


  除了铺天盖地的网络门禁外,展会中可以看到的另一个变化便是核心处理器级别的明显升级,如在门禁控制器方面,几乎再没有传统的8位单片机技术,取而代之的是32位嵌入式ARM技术,升级后的产品具有高性能、低成本和低功耗。目前,32位机也已成为主流。一些控制器死机自动重启、线路自动监测及双总线技术也是目前较为热门的功能。

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