MCT系列红外测试仪通信协议.c.docVIP

Appendix V - Serial Communications Protocol for MCT 300 附录V- MCT系列测试仪系列串行通信协议 Cables 电缆 RS232: Connection: Via shielded twisted pair.屏蔽双绞线双绞线 Signal信号 Digital 数字接口 Connector # 9Pin D 9针D接口 Connector # TX 3 2 RX 4 3 GND 5 5 RS485: Via a shielded twisted pair. 屏蔽双绞线 Connection: Refer to Section 11.0 参考11.0 Communications 通信 Programmers writing software should refer to the command list below. The communications is a simple request/reply system. The host computer sends a request and the MCT 300 sends a reply. Hence there are no special protocols or handshaking involved and it is also quite easy for a person to communicate with the MCT 300 via a simple terminal. 程序员编写软件应参考下表的指令，通信指令是简单的应答应答系统。电脑主机发送请求MCT系列测试仪回应，中间没有特殊交换协议，MCT系列测试仪终端的人机通信十分简单 The timing of the replies it deliberately locked to the wheel revolutions and hence the maximum communications rate is approx. 18 requests/replies per second. Should the wheel or motor fail then a timing software system of 10 loops per second takes over so communications is not lost. 回应时间与光轮转动对应，应答的最快通信频率为18次/秒，一但光轮和马达停止，为防止丢失信号，系统控制为10次/秒 When using RS485 a leading $ or # followed by a single, alphanumeric ID character wakes up the target unit and it responds with a reply. Each unit on the RS485 daisy chain has a unique ID and hence all units may be accessed across a simple single twisted pair cable. Normally IDs are A-Z, and the default ID is 1. Hence when adding more MCT 300s to an existing and running RS485 system, the user will look for the ID of the unit and assign it a new ID. This process can be repeated for each new unit added. RS485用S”或“#”带单个字符的ID对测试仪进行唤醒和响应，每台机在RS485串链上有独立ID，只要通过一条双绞线电缆就能把全部的 机接入，ID通常为A-Z，默认值为1，每次在现有工作中的RS485系统上增加MCT系列测试仪机要配置设定新ID。 The BAUD rate may be changed by a serial command, but this should not be necessary as the filter data can be extracted at the default 9600 rate and the BAUD rate is not the limiting factor a