Sharp ER-A520 Service Manual page 15

Sharp cash register user manual
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11. RISTRICTIONS ON PRINT RATIO
Max. 288dot/1line x 140line (Corresponds to black background LOG print)
Ave. 108dot/1line or less (Corresponds to 12.5% of all dots)
12. BUZZER
Oscillation frequency is 2.048kHz (2.0kHz~2.2kHz).
<CPU PORT>
Signal to
No.
CPU PORT
be used
29
P80
BUZZER
13. UP-P16DP I/F
The ER-A520/530 is provided with I/F with CKDC on the option display
of UP-P16DP.
<CPU PORT>
Signal to
No.
CPU PORT
be used
26
INT1#
SHEN#
7
CLK3
SCK
6
RxD3
STH
5
TxD3
HTS
8
P126
CKDCR
The CKDCR "HIGH" time to input RESET to the UP-P16DP is min
30us.
14. RESET
The RESET signal is generated under the following condition.
1) When the MODE key switch position is changed from SRV' to any
other position (excluding OFF position).
Function
BUZZER SIGNAL
Function
CKDC interface shift enable signal
CKDC interface synchronizing shift
clock
CKDC interface shift input data
CKDC interface shift output data
CKDC reset signal
ER-A520U/ER-A530U HARDWARE DESCRIPTION
15. POFF
The POFF signal is changed from 0 to 1 when the 5V power and the
24V power reach the operating voltage level.
It is changed from 0 to 1 when the power falls below the operating volt-
age level.
POFF, RESET TIMING CHART
+5V
20.8V
+24V
/RESET
/POFF
/EFTRES
POWER ON
Instant service
interruption
– 14 –
min.10ms
MODE
MODE
POWER OFF
SRV'
Other than
SRV'
min.10ms

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