Reading RAW Data From RS232 Device & Split Them!

[rusda.mr]

@Paul_KD7HB

OK. But get rid of the delay.
Does the code work?
Paul

Yes, the code can work, but some of the data is incomplete.

@Paul_KD7HB

Help me understand the protocol.
Does you device only, ever send a message one time after you have sent a request? So the communication is request and then response.
Otherwise, there is no way to identify the beginning of a new message, nor is there a way to identify the end of a message.
Are the messages of a single type ALWAYS the same length?
Paul

I will include the procedure for communication with the Truck Controller that I got from the Shop Manual. Yes, the communication is request and then response.

This is output from Arduino (The Truck Is Empty And Stopped):

And, This is output from RS232 Serial Cable With App Software :

The Truck controller transmits the real-time data normally
after 0.2 seconds. If this condition is repeated 10 times, the Controller stops transmission. So I need to send command continuously to get Real Time data.

@Whandall

It seems all messages are framed with STX < message > ETX CRC.

Yes, All messages format are frame with STX-ETX & BCC.

@gcjr

consider following checked on laptop (yes, looks like BCC (0x75) is incorrect in first msg;

I apologize from my typo, you are right, it is 7E Not 75
(Calculation from STX-ETX)

@gcjr

consider following checked on laptop (yes, looks like BCC (0x75) is incorrect in first msg;

Thanks for helping me, I'll try again.

I apologize.
Due to the time difference between our locations, I'm late in replying to your message