Status Monitoring Circuits - Epson LQ-1050 Technical Manual

REV.-A

2.3.5 Status Monitoring Circuits

The state of each sensor and switch associated with the printer mechanism is detected by the A/D
converter (ports
to 8-bit digital data and is compared with a reference value by the firmware. The detected signals are
shown in Table 2-14.
Analog port
AN 1
I
I
I
AV
CC
AV
SS
AV 4.75V DC
REF
of the CPU. The detected value (analog data) input to each port is converted
Table 2-14. CPU Analog Ports Function
Name
At operation (monitoring)
TEMP Printhead temperature
VOLT DC
Switches status on the control panel
Switches status on the control panel DIP SW 1-6
I
I
DC Power for the A/D converter
—
GND for the A/D converter
Reference voltage for the A/D
converter
Description
power line voltage
—
—
—
—
2-40
At initialization (reading)
—
—
DIP 1-5
DIP 1-3, 1-8, 2-2, 2-6
DIP SW 1-4, 2-3, 2-7, 2-8
DIP SW 1-1, 1-7, 2-4
value
DIP SW 1-2, 2-1, 2-5
value