Epson TM-L90 Developer's Manual page 89

Confidential
Resetting the printer using the interface
The printer can be reset using interface pins 6 and 25 by changing the DIP switch setting.
Reset Switching
Signal Line
Pin 6 (DSR)
Pin 25 (INIT)
To reset the printer, the following requirements must be satisfied.
DC characteristics:
Reset DC Characteristics
Input HIGHT voltage
Input LOW voltage
Input HIGH current
Input LOW current:
Input impedance:
AC characteristics:
Minimum reset pulse width:TRS 1 ms (minimum)
• When using pin 6 (DSR) (Msw 1-7 is ON):
SPACE
• When using pin 25 (INIT) (Msw 1-8 is ON):
SPACE (H)
MARK(L)
Note:
When a signal that does not satisfy the requirements above is input, printer operation is not guaranteed.
When a signal is input to pin 25 (INIT) at the TTL level, the requirements above must also be satisfied.
Although a signal is input to pin 6 (DSR) at the TTL level, according to the DC characteristics described
above, the operation is not guaranteed and pin 6 cannot be controlled.
When pin 6 (DSR) and pin 25 (INIT) are open, the printer is operating
A-4 Interface And Connectors
Memory Switch
MSW 1-7: ON
MSW 1-8: ON
Pin 6 (DSR)
VHI -15 to +3 V
VIL +3 to +15 V
IIH -5.3 mA (maximum)
IIL -5.0 mA (maximum)
3 kΩ Ω Ω Ω (minimum)
RIN
TRS
H
L
MARK
Minimum Reset Pulse Width (pin 6)
TRS
H
L
Minimum Reset Pulse Width (pin 25)
Reset Condition
MARK level input
SPACE or TTL-HIGH level input
Pin 25 (INIT)
+2 to +15 V
-15 to + 0.8 V
1 mA (maximum)
-2 mA (maximum)
Rev. A