Commands From The System Unit - Mitsubishi Electric LS Pro Hardware Technical Reference

Buffer overflow (00h or FFh)
This code is sent to the system unit when the type ahead buffer overflows. 00h is sent
if code sets 2 or 3 are in use; FFh is sent if code set 1 is in use.
Identification byte (83ABh)
These bytes are sent to the system unit in response to a read ID command. The
keyboard stops scanning, sends the ID bytes, then continues scanning. The least
significant byte is sent first.
Commands from Commands are sent from the system unit to the keyboard via the keyboard controller
the system unit data buffer. The controller inserts a parity bit and transmits the data serially to the
keyboard. No further transmission is sent to the keyboard until the keyboard
acknowledges receipt of the data byte.
The command bytes which the keyboard recognises are listed below.
Command
EDh
EEh
EFh
F0h
F1h
F2h
F3h
F4h
F5h
F6h
F7h
F8h
F9h
FAh
FBh
FCh
FEh
FFh
When the keyboard receives any of these commands, it sends an ACKnowledge (FAh)
response. If the data is incorrectly received the keyboard sends a RESEND (FEh)
request.
The use and formats of these commands is described in the following paragraphs.
Peripheral items
Description
Set/reset LED indicators
Echo
No operation
Select alternate scan codes
No operation
Read ID
Set typematic rate/delay
Enable
Default disable
Set default
Set all keys typematic
Set all keys make/break
Set all keys make only
Set all keys typematic/make/break
Set key to typematic
Set key to make/break
Resend
Reset
LS PRO HARDWARE TECHNICAL REFERENCE 4/21