Hello!! First a question is it possible to communicat via the serial port with a card reader??? Because i need this for a batch which i have to write! So please help me, if you know the right syntax for input and output with the serial port! Thx! Greetings, Joe

Well, serial communication is certainly possible in DOS--people have been doing it for decades. Do you only need to send, or send and receive? Is the data character-based or binary? Are there any special framing requirements? (Start bit, stop bit, parity bits, etc.) If you only need to send character-based data, you could do this from a command prompt (or batch file) by using ECHO to send the data to the port. (This is typically how I've sent special commands to serial printers, externals modems, and APC Back-UPS standby power supplies.) Or you could use redirection (using the left and right angle bracket symbols ""). It depends on what you need to do exactly. What does the card reader expect to see at its port?

I need a syntax with that i can input and output strings! I have to send a string, like that !6100122 to the card reader! After this i must receive the answers of this card reader! I hope you can help me! greetings, Joe