Tastaturcontroller

FAQ




How can the key functions of your keyboard controller be programmed?

The key functions are programmed by us with a PC-programming device according to the assignment or array specified on the customer’s part. Afterwards, the program is verified in the same way.

 

 

Can the programming of the keyboard controller be carried out by the customer?

No, this is not possible. You will receive a fully programmed and verified controller.

 

 

Can a controller program be modified or overwritten?

Yes, this can easily be realised by us, as soon as you send us the controller and the new specifications.

 

 

What do "N-Key-Rollover" and "2-Key-Rollover" signify?

If no measures are taken during the interpretation of a keyboard matrix, only two simultaneously performed keystrokes can - for technical reasons - be analysed and sent to the PC. This is called 2-key-rollover. If 3 or more keys are pressed, the controller can't decide, which key exactly was activated. On the screen this effect is shown by so called "ghosts", signs whose key wasn't activated at all. In order to evitate this problem, decoupling diodes can be put in the matrix of the keys. Such a prepared controller is called n-key-rollover-compliant, all keys can be analysed simultaneously. But not all key codes can be transmitted simultaneously to the PC because the protocols (PS/2,USB) don't support this. Alternatively to diodes, a special configuration of the matrix can allow a n-key-rollover, for example if "STRG" and "ALT" are connected separately, so that combinations made of 3 keys, for example "ALT" + "STRG"+ "ENTF", are possible even without diodes.

 

 

What is an AUTOREPEAT?

The controller repeatedly sends the code of the pressed key to the PC as long as the key remains pressed.

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