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Peripheral items
Set/reset LED indicators (EDh)
This command is used to set the LEDs on the keyboard. When the keyboard receives
this command it responds with the ACK (FAh). The controller then sends the
parameter byte. On receipt of the parameter byte the keyboard updates the LEDs. The
format of the parameter byte is shown below:
7
6
5
4
Note
Bit 7 must be set to 0.
Echo (EEh)
The keyboard responds to this command by sending an "echo response" (EEh), and
then continues with normal operation.
Set typematic rate/delay (F3h)
The keyboard responds with an ACK, stops scanning, and waits for the rate/delay byte
from the system unit. The format of the byte is as follows.
7
6
5
4
Rate Parameter
The typematic rate (number of make codes per second) is from 2 make codes per
second with bits D0 to D4 all set to 1, to 30 make codes per second, with bits D0 to
D4 all set to 0.
Delay Parameter
The delay before the typematic operation comes into effect is shown in the table below:
Enable (F4h)
The keyboard responds with an ACK, clears its output buffer, and enables key scanning
and keycode transmission.
4/22 LS PRO HARDWARE TECHNICAL REFERENCE
3
2
1
0
scroll lock LED
num lock LED
caps lock LED
reserved
3
2
1
0
rate
delay
reserved (always 0)
D6
0
0
1
1
D5
Delay
0
250mS
1
500mS
0
750mS
1
1000mS
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