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KRC-1054R
22
CIRCUIT DESCRIPTION
(5) When the EJECT, TUNER, TAPE or CD-CH key is
pressed in stop status
PANCON
STOP
Me a
OPERATION MODE
eee)
ee
(6) Timing in case of momentary power failure
a
pe
PANCON
oe
alo
a
STOP
ft
ae
eee,
OPERATION MODE
pee
ee
KEY
In case of momentary power failure, because the
panel power and the STOP terminal are provided with
time constants, the status should be held for 200 ms or
more after PANCON or STOP is stopped.
7-6. Communication
method
(3-wire, unidirec-
tional)
The head unit outputs CLOCK (8 bits) at the positive
going of REQUEST from the Panel u-COM. The data
the head unit receives at this time becomes the key
data.
If the Panel u-COM does not receive the CLOCK in-
put within 100 ms after it rises REQUEST, it identifies a
communication error, turns REQUEST OFF and restart
the communication.
REQUEST
al
(a
ere
=a
EE
ae
oan
eae
|e
Min. 200ms
| 400ms |
While STOP is Low, this restart operation is tried up
to 5 times per key input, and after the 5th try the panel
returns in the stop status.
The Panel u-COM uses the serial ports. Data is input
at the positive going of CLOCK.
(ON in 1sec.
after stop is
released)
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