LK204-24-USB Keypad Input

jhauxwell · Post by **jhauxwell** » Mon Jul 31, 2006 8:25 am

Hi,

Could someone clarify something for me please? - i was under the impression that the keypad inputs on the display would generate ascii charachters as if the keys had been pressed on a keyboard.... i take it this is not the case as i cant get this to work.

Can anyone shed any light on my problem, i am using software that talks to the display perfectly and it is controlled by the keys U,D,L + R. I was hoping that the display could have the buttons connected to the keypad interface and simulate these key presses to control the software.

Have i completely got the wrong idea?

Any help would be appreciated.
Joel.

Jon · Post by **Jon** » Mon Jul 31, 2006 9:39 am

Hi Joel,

If you have a keypad connected to the display, the display will generate an ASCII character when it detects a keypress, which will immediately be sent to the host device over the USB cable.

Please see the Manual beginning on page 16, section 3 Keypad Interface.

In order for your software to react to the keypress it must be monitoring the input coming from the display screen. (for example the virtual com port 4)

I hope this helps a bit.

--
Jon

jhauxwell · Post by **jhauxwell** » Mon Jul 31, 2006 2:25 pm

Hi Jon,

Thanks for your reply, it seems like i have misunderstood the use of the keypad input. The software i am using has no facility to 'listen' to a com port for inputs, it simply responds from keys on a regular keyboard.

I was under the impression that this was how the keypad interface would function so that for example if a text editor was open on the pc and the correct row/column was shorted out on the display then the character 'A' for example would be generated as if 'A' on the keyboard had been pressed.

I hope this makes sense.

Cheers,
Joel.