Epson PC AX Technical Manual page 122

PRINCIPLES OF OPERATION
HEV.A
(7) Echo
The keyboard transmits a code "EE" response and continues scanning
(when preceeded as an Enable).
(8) Set/Reset mode indicators
This command is made up of a 2-byte cornmand and an option. The
keyboard responds to the host side with and ACK command and waits
for sending of the option. Then keyboard responds to the option,
sets the indicator and starts scanning (when proceeded as an
Enable). If it receives another command instead of the option, the
indicator condition remains unchanged and the keyboard stops, this
command operation. Then proceeds the new command and starts
scanning.
TABLE 2-5-17. OPTION REGISTER FüR KEYBOARD
MSB LSB
SCROLL LOCK
INDICATOR
NUMERIC LOCK
INDICATOR
CAPS LOCK
INDICATOR
(9) Read Keyboard ID
The keyboard responds with the ACK cornmand, transmits a 2-byte data
; "AB" +
"83"
2-94