Epson EPL-N2000 User Manual - Page 134

Error handling, Pin assignments, overrun error is detected.

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Once the vacant area for data in the buffer recovers to 512 bytes, the printer outputs the XON code or sets the DTR flag to high (SPACE), indicating that it is again ready to receive data. Error handling An asterisk (*) is printed if a parity error, framing error, or overrun error is detected. Pin assignments The serial interface connector pin assignments and interface signals are described in the table below. "Direction" refers to the direction of signal flow as viewed from the printer. Signal pin 1 RS-232C DTR 2 CTS 3 TXD 4 GND Direction OUT Current loop N.C. Direction - IN - - OUT TTY-TXD IN return - GND - Description Data terminal ready. Indicates whether or not the printer is ready to receive data. If the printer ready protocol is not selected, the printer is always ready to receive data ( pin is always HIGH). If the printer ready protocol is selected, the printer can accept data when the pin level is HIGH and cannot accept data when the pin level is LOW. When the DTR signal goes LOW, the host computer must stop sending data within 256 characters. This function can be set on or off with the printer's default-setting mode. Always ignored. Transmits data from the printer to the computer. Always ignored. A-10 Specifications

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A-10
Specifications
Once the vacant area for data in the buffer recovers to 512 bytes,
the printer outputs the XON code or sets the DTR flag to high
(SPACE), indicating that it is again ready to receive data.
Error handling
An asterisk (*) is printed if a parity error, framing error, or
overrun error is detected.
Pin assignments
The serial interface connector pin assignments and interface
signals are described in the table below. “Direction” refers to the
direction of signal flow as viewed from the printer.
Signal
pin
RS-232C
Direction
Current
loop
Direction
Description
1
DTR
OUT
N.C.
—
Data terminal ready.
Indicates whether or not
the printer is ready to
receive data. If the
printer ready protocol is
not selected, the printer
is always ready to
receive data ( pin is
always HIGH). If the
printer ready protocol is
selected, the printer
can accept data when
the pin level is HIGH and
cannot accept data
when the pin level is
LOW. When the DTR
signal goes LOW, the
host computer must
stop sending data within
256 characters. This
function can be set on
or off with the printer’s
default-setting mode.
2
CTS
IN
—
—
Always ignored.
3
TXD
OUT
TTY-TXD
return
IN
Transmits data from the
printer to the computer.
4
GND
—
GND
—
Always ignored.