使用Matlab从线性位移台设备等待命令超时 [英] timeout on waiting for command from linear stage device using matlab
问题描述
我正在尝试在步进电机控制器的RS485端口与笔记本电脑的COM端口之间建立全双工串行通信.我使用的电缆连接到控制器上的RS485和笔记本电脑上的USB端口.我正在使用Matlab脚本向控制器发送和接收命令，以在导向线性刻度上移动舞台块.虽然我可以打开与设备的串行连接并发送命令以线性扩展位移台，但我无法从控制器接收任何响应消息. 我在Matlab中有以下代码-
I am trying to establish a full duplex serial communication between the RS485 port of a stepper motor controller and the COM port of my laptop. The cable I use connects to RS485 on the controller and to a USB port on my laptop. I am using a Matlab script to send and receive commands to the controller to move a stage block on a guided linear scale. While I can open the serial connection to the device and send commands to advance the stage block on the linear scale, I am unable to receive any response message from the controller. I have the following code in Matlab -
stage = serial('COM4', 'baudrate', 9600, 'terminator', 'CR');
fopen(stage)
%part below does not work and timeout happens
fprintf(stage,'@00VER')
pause(10)
out = fscanf(stage)
%part below works and I am able to move the block for 5 secs.
fprintf(stage, '@00HSPD=5000');
fprintf(stage, '@00J+');
pause(5);
fprintf(stage, '@00STOP');
pause(5);
fclose(stage)
delete(stage)
clear stage
脚本等待消息时发生超时，如下所示-
A timeout happens while script waits for message as shown below -
Warning: Unsuccessful read: A timeout occurred before the Terminator was
reached..
out =
0×0 empty char array
如果有人指出如何从控制器获取任何消息(这是简单的OK还是我在上面的代码中尝试的版本)，这将很有帮助.
It would help if someone can point out how to get any message from the controller, either a simple OK or the version as I am trying to do in the above code.
我必须指出，我提到了以下问题，但是它们没有帮助，或者我无法将我的问题与给定的解决方案联系起来-
I must point out that I referred to following questions but either they did not help or I was unable to connect my problem with the solution given -
- Serial communication timeout on long cable time out
- USB Communication from Arduino to Unity: Timeout Error
推荐答案
您需要从设备文档中确定一些通讯细节.
There are some details for the communication you need to make sure from the device documentation.
首先，您似乎正在查询设备的版本.确保"@ 00VER"是正确的命令，并且设备是否需要终止符来识别该命令，例如"\ r"?
First, it seems you are querying the version of the device. Make sure '@00VER' is the correct command, and does the device need a terminator to recognize the command, like '\r'?
第二，确保需要终止符，如果需要，请更正.要进行调试，您可以不使用终结者"来设置端口，然后读取端口以检查获得的结果.
Second, make sure the terminator is needed, and, if so, correct. To debug, you can set up the port using no 'Terminator', and read the port to check what you get.
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