Confidential
EPSON
TITLE
SHEET
REVISION
NO.
SHEET
NEXT
B
RP-U420 series
Specification
(STANDARD)
71
70
DLE ENQ n
[Name]
Real-time request to printer
[Format]
ASCII
DLE
ENQ
n
Hex
10
05
n
Decimal
16
5
n
[Range]
1
≤
n
≤
3
[Description]
Responds to a request from the host specified by n. The operations performed depends
on the value of n, as follows:
n
= 1: Recover from an error and restart printing from the line where the error
occurred.
n
= 2: Clear the receive and print buffers and recover from an error.
n
= 3: Cancel waiting for validation.
[Notes]
•
The printer executes this command upon receiving this command.
•
With a serial interface model, this command is executed even in the off-line, receive
buffer-full, or error states.
•
This command is transmitted anytime the data sequence <10>H<05>H<
n
> (1
≤
n
≤
3)
is received, even if it appears as part of another command,
<Example>
In ESC
∗∗∗∗
m n
L
n
H
d1 ... dk
,
d1
=<10>H,
d2
=<05>H,
d3
=<1>
•
This command should not be used within the data sequence of another command that
consists of two or more bytes.
<Example>
If you attempt to transmit ESC R
n
to the printer, but DLE ENQ 3 interrupts before n is
received, the code <10>H for DLE ENQ 3 is processed as the code for ESC R <10>H.
•
DLE ENQ 1 restarts printing from the line where the error occurred.
This command is available only for recoverable errors other than a print head
temperature error.
•
DLE ENQ 2 enables the printer to recover from an error after clearing the data in the
receive and print buffers. The printer retains the settings (form ESC!, ESC R, etc.)
that were in effect when the error occurred, Using DLE ENQ 2 and ESC @, the printer
can be completely initialized. DLE ENQ 2 is available only for recoverable errors other
than a print head temperature error.
•
The printer enters papar roll mode after recovering from an error by using DLE ENQ 2.
•
DLE ENQ 3 is available only when the printer is waiting for the insertion of validation
paper, and is ignored in other states. After the printer is released from the cut sheet
waiting state, the paper roll is selected.
•
When the cut sheet waiting state canceled by DEL ENQ 3, the data in the receive and
print buffers is cleared.
•
DLE ENQ 1 and DLE ENQ 2 are enabled, even if the printer is canceled by ESC =.
