inkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans CN", sans-serif; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(38,38,38); FONT-STYLE: normal; MARGIN: 0px 0px 20px; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; LINE-HEIGHT: 1.8; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 2em; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; overflow-wrap: break-word'>RS232是标准接口，为D形9针头，所连接设备的接口的信号定义是一样的，其信号定义如下：
inkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans CN", sans-serif; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(38,38,38); FONT-STYLE: normal; MARGIN: 0px 0px 20px; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; LINE-HEIGHT: 1.8; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 2em; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; overflow-wrap: break-word'>X
inkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans CN", sans-serif; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(38,38,38); FONT-STYLE: normal; MARGIN: 0px 0px 20px; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; LINE-HEIGHT: 1.8; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 2em; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; overflow-wrap: break-word'>而RS422/RS485为非标准接口，一般为15针串行接口（也有使用9针接口的），每个设备的引脚定义也不一样 。另外还需要说明的是，RS422和RS485也有区别：RS422为4线制，全双工模式；RS485为两线制，半双工模式 。
inkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans CN", sans-serif; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(38,38,38); FONT-STYLE: normal; MARGIN: 0px 0px 20px; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; LINE-HEIGHT: 1.8; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 2em; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; overflow-wrap: break-word'>RS-232、RS-422与RS-485都是串行数据接口标准，RS-232是PC机与通信中应用最广泛的一种串行接口 。RS-232被定义为一种在低速率串行通讯中增加通讯距离的单端标准 。RS-232采取不平衡传输方式，即所谓单端通讯，而RJ45接口通常用于数据传输，最常见的应用为网卡接口 。下面就由广州莱安智能化系统开发有限公司介绍一下：