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厦门泰尼电气有限公司
主营产品: AB模块PLC |

![]() |
厦门泰尼电气有限公司
主营产品: AB模块PLC |
参考价 | 面议 |
140XBE10000---140XBE10000
140XBE10000---140XBE10000
做好编程电缆,首先要大概了解一下这三种串行通信接口标准。RS-232、RS-422与RS-485是三种串行数据接口标准,接口标准只对接口电气特性做出规定,而不涉及接插件、电缆或协议,同样一种接口标准可以有不同物理结构,如DB-9 、DB-25等。
:张亮(工程师) 专线:
24小时移动专线: 【】
RS-232是PC机与通信工业中应用zui广泛一种串行接口, RS-232C总线标准设有25条信号线,包括一个主通道和一个辅助通道。多数情况下只使用主通道,常用九条信号线(九针D形口),各引脚定义如表一所示。一般双工通信,仅需几条信号线就可实现,如发送数据线 TXD 和接收数据线RXD以及逻辑线GND,RS232C只能点对点通讯,传输距离短,共模抑制能力差。
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