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XE-A212V
HARDWARE DESCRIPTION
– 11 –
9. A/D CONVERSION
The machine has the following four signals at the A/D conversion ports.
<CPU’s
PORT>
1
Printer head temperature monitor
A voltage divided by the printer head temperature monitoring ther-
mistor and the resistor is inputted to AN0 pin.
Printer head conduction must be controlled as shown below. For
the printer head conduction time, refer to the M-T53
II
specifica-
tions.
2
Printer head voltage monitor
A voltage supplied by the printer head power through the printer
and divided by the resistor is inputted to AN1 pin. The A/D conver-
and divided by the resistor is inputted to AN1 pin. The A/D conver-
sion value is read after turning the VPON signal (CPU P105) to
HIGH and stabilizing the voltage (20msec).
The print enable voltage range is 7.5V ~ 8.0V (A/D value: ??? ~
???). The voltage is calculated from the AN1 value and the A/D
???). The voltage is calculated from the AN1 value and the A/D
conversion value of the AN2 reference voltage. For the calculation
method, refer to the M-T53
II
specifications.
3
Reference voltage
The CPU power VDD is used as the reference voltage.
4
Battery remaining voltage
10. BUZZER
PIEZO type BUZZER
The oscillating frequency is 4.0kHz
m
0.5kHz
11. RESET
The RESET signal is canceled when the power source of the device
which used the 5V system (VCC, VDD, VLED) reaches the operating
voltage.
voltage.
The RESET signal is generated under the following conditions.
1) When the mode key switch is set from SRV' to another position
(except for OFF position).
2) When the power is turned on after 5sec or more from turning off the
power and the VCC reaches 5V.
3) When the mode key switch is set from OFF position to another posi-
tion (except for SRV’ position) and VCC reaches 5V. (If the OFF
time is within 5sec, the RESET signal may not be supplied.)
12. POFF
The POFF signal is changed from 0 to 1 when the 5V power and the
24V power reach the operating voltage level. When they fall below the
operating voltage level, the POFF signal is changed from 1 to 0.
operating voltage level, the POFF signal is changed from 1 to 0.
<POFF, RESET TIMING CHART>
In the model where a dry cell is used as the bakc-up battery, the CPU
monitors the battery voltage when it operates. When the voltage falls
below 2.8V, the RESET signal is supplied to prevent against malfunc-
tion of the CPU.
tion of the CPU.
No.
CPU
PORT
Signal
name
FUNCTION
97
AN0
TM
PRINTER HEAD temperature monitor
95
AN1
VPTEST
PRINTER HEAD voltage monitor
94
AN2
VREF
Refarence voltage
93
AN3
VBAT
VBAT (Battery voltage)
HEAD
tempreture
A/D conversion
value (DEC)
Operation
-10°C or below
929~1023
MOTOR LOCK
-10°C ~ 0°C
869~928
Print in conduction time at 0°C
0°C ~ 70°C
232~868
Print in conduction time specified
in the PR-45M specifications.
in the PR-45M specifications.
70°C or above
0~231
MOTOR LOCK
NO BATTERY
3.0V
LOW BATTERY 3.3V
+5V
+24V
/POFF
4.5V
20.8V
POWER ON
POWER OFF
MOMENTARY
STOP
STOP
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