Serial Communication Tutorials. Using ActiveXperts Serial Port Component with Delphi. ActiveXperts Serial Port Component is a software development kit. Serial communication library for Linux. C++ Builder, Delphi incl. Embarcadero RAD XE2 XE3 XE4 XE5 XE6 XE8 Studio,CodeGear. Serial Data transmission. Arduino serial communication Search. Have a look at the examples in - simple reliable ways to receive data. It is not a good idea to use the String (capital S) class on an Arduino as it can cause memory corruption in the small memory on an Arduino. Just use - char arrays terminated with 0. It will be much easier to debug your program if you first get your Arduino program working with the Serial Monitor and then get your Delphi program to take the place of the Serial Monitor with the Arduino code unchanged. I don't know Delphi - is a any help?R. I need a simple communication protocol between two devices (a PC and a microcontroller). The PC must send some commands and parameters to the micro. The micro must transmit an array of bytes (data from sensor). The data must be (besides parity checking, I think I need some other data correction method). Is there any standard solution to do this? (I need only an idea, not the complete solution). Any advice is appreciated. P.P.S Sorry for any grammar mistakes, I hope you understand. I have not decided whether it will be master/slave protocol or both sides can initiate communication. The PC must know when micro have done a job and can send data. It can continuously poll the micro if data is ready, or the micro can send data, when a job is done. I don't know which is better and simpler. Hardware and protocol. Since C serial standard used in the PC, I will use. I will use only RxD, TxD and GND signals. I can't use additional wires because the microcontroller AFAIK doesn't support them. BTW I'm using the ATmega128 chip. So I will use fixed baud rate, 8 bits of data, 2 stop bits without parity checking (or with?). That's what my question primarily concerned about. Thanks for suggesting, and protocols. After effect video templates. I will research on it. I have had good luck with it in the past. I would for a point to point serial just use the and forget about all of the other control stuff as it would probably be overkill. In addition to using HDLC for the framing of the packet. I format my packet like the following. This is how options are passed using 802.11 U8 cmd; U8 len; u8 payload[len]; The total size of each command packet is len +2 You then define commands like #define TRIGGER_SENSOR 0x01 #define SENSOR_RESPONSE 0x02 The other advantage is that you can add new commands and if you design your parser correctly to ignore undefined commands then you will have some backwards compatibility. So putting it all together the packet would look like the following. // total packet length minus flags len+4 U8 sflag; //0x7e start of packet end of packet flag from HDLC U8 cmd; //tells the other side what to do. U8 len; // payload length U8 payload[len]; // could be zero len U16 crc; U8 eflag; //end of frame flag The system will then monitor the serial stream for the flag 0x7e and when it is there you check the length to see if it is pklen >= 4 and pklen=len+4 and that the crc is valid. Note do not rely on just crc for small packets you will get a lot of false positives also check length. If the length or crc does not match just reset the length and crc and start with decoding the new frame. If it is a match then copy the packet to a new buffer and pass it to your command processing function. Always reset length and crc when a flag is received. For your command processing function grab the cmd and len and then use a switch to handle each type of command. I also require that a certain events send a response so the system behaves like a remote procedure call that is event driven. So for example the sensor device can have a timer or respond to a command to take a reading. It then would format a packet and send it to the PC and the PC would respond that it received the packet. If not then the sensor device could resend on a timeout. Also when you are doing a network transfer you should design it as a network stack like the as points don't forget about the. My post with the HDLC is the and the. RS232 protocols are tricky. The suggestion to use HDLC, is a good one, but its not the entire solution. There are other things you need to decide: • How will the baud rate between the two devices be determined? Predefined, or set explicate? FX-35 Twin; Manual; BRONDI FX-35 Twin Manual. Related Manuals for BRONDI FX-35 Twin. To listen to another handset user Make sure you are not pressing the TALK button Receiving symbol ( ) is shown on the display when the other person is speaking. Don't try to transmit until they have finished. User manual. • Will you do flow control in software or hardware or both? Note, if you use hardware flow control then you must make sure, that the cables are built correctly. • Speaking of cables, this is a huge pain with RS233. Depending on the device, you may need to use a straight through cable, or a cross over cable, or a variant. • Using a software based flow control mechanism can be effective as it allows the most simple cable to be used - just three wired (TX, RX, and common). • Do you pick a 7 or 8 bit word?
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |