Confidential
EPSON
TITLE
SHEET
REVISION
NO.
SHEET
NEXT
B
RP-U420 series
Specification
(STANDARD)
13
12
2.1.1.6 Notes on setting DIP switch 1-6 to on
1) The printer mechanism stops but does not become BUSY in the following cases:
•
When an error occurs.
•
When the printer stops printing due to a paper-end.
•
When paper is fed using the feed button.
2) When using the DLE ENQ command, make sure that the receive buffer does not become full.
•
Notes on using a host that cannot transmit data when the printer is BUSY:
If an error occurs when the receive buffer is full and the printer is BUSY, the DLE ENQ commands
cannot be used.
•
Notes on using a host that can transmit data when the printer is BUSY:
If a DLE ENQ command is used while sending bit-image data, and the receive buffer-full state is
encountered during transmission of the data, the DLE ENQ is processed as bit-image data.
In addition, the data transmitted during the receive buffer-full state may be lost.
Example:
Check the status with GS r for each line of printing transmitted. Make sure the data for printing
each line does not cause the printer to enter the receive buffer-full state.
2.1.1.7 Notes on resetting the printer using the interface
The printer can be reset through the interface (pins 6 or 25) by changing the DIP switch settings
accordingly (Refer to Table 2.1.3).
Table 2.1.3 Switching of the Reset Condition
Pin No.
DIP Switch
Reset Condition
Pin 6 (DSR)
DSW 2-2: ON
MARK input
Pin 25 (INIT)
DSW 2-1: ON
SPACE or TTL-HIGH level voltage signal input
To reset the printer, the conditions given below must be satisfied:
<DC characteristics>
Table 2.1.4 DC Characteristics of the Reset Condition
Item
Symbol
Pin 6 (DSR)
Pin 25 (INIT)
Input HIGH level voltage
V IH
+3 to +15 V
+2 to + 15 V
Input LOW level voltage
V IL
-15 to -3 V
-15 to + 0.8 V
Input HIGH level current
I IH
5 mA (maximum)
1 mA (maximum)
Input LOW level current
I IL
-5.3 mA (maximum)
-2 mA (maximum)
Input impedance
RIN
3 k
Ω
(minimum)
