Epson EPL-N1200 Service Manual - Page 31

Table 1-10., Serial Interface Pin Assignments

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EPL-N1200 Service Manual General Description Table 1-10. Serial Interface Pin Assignments Pin No. RS-232C Current Loop Description ^ Signal Name I/O Signal Name I/O ^ Signal output by the printer. When the DTR signals HIGH, the RXD signal can be received by the printer. The SelecType setting doesn't specify DTR control, the signal level is HIGH while the printer power is 1 DTR O N.C. - on. When SelecType setting is used for DTR control, DTR goes LOW in case of any error conditions. The data (RXD) from host computer must be stopped within 256 characters after DTR goes LOW. 2 CTS I N.C. - Always ignored. TXD: Serial ASCII data output from the printer. It maintains " MARK" state (LOW level) 3 TXD O TTY-TXD return - between transmitted character codes. Logic 0 is at HIGH level (" SPACE" ) and logic 1 is at LOW level (" MARK" ). TTY-TXD return: Refer to TTY-TXD. 4 GND - GND - Ground. RXD: Serial ASCII data input to the printer. It 5 RXD I TTY-RXD return - maintains " MARK" state (" LOW level) between received character codes. TTY-TXD return: Refer to TTX-RXD. TTY-TXD: Serial ASCII data output from the printer. The logic is determined by the impedance between pins 3 and 6. 6 N.C. - TTY-TXD O Logic 0 is high impedance (" SPACE" ) at current off and logic 1 is low impedance (" MARK" ) at current on. It maintains " MARK" state (LOW level) between transmitted character codes 7 N.C. - N.C. - Not connected. TTY-RXD: Serial ASCII data input to the printer. The logic is determined by the impedance between pins 5 and 8. 8 N.C. I TTY-RXD I Logic 0 is high impedance (" SPACE" ) when current is off and logic 1 is low impedance (" MARK" ) when current is on. It maintains " MARK" state (LOW level) between transmitted character codes Rev. A 1-19

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Table 1-10.
Serial Interface Pin Assignments
Pin No.
RS-232C
Current Loop
Description
^
Signal Name
I/O
Signal Name
I/O
^
1
DTR
O
N.C.
-
Signal output by the printer. When the DTR
signals HIGH, the RXD signal can be
received by the printer. The SelecType
setting doesn’t specify DTR control, the
signal level is HIGH while the printer power is
on. When SelecType setting is used for DTR
control,
DTR goes LOW in case of any error
conditions.
The data (RXD) from host computer must be
stopped within 256 characters after DTR
goes LOW.
2
CTS
I
N.C.
-
Always ignored.
3
TXD
O
TTY-TXD
return
-
TXD:
Serial ASCII data output from the printer.
It maintains “ MARK”
state (LOW level)
between transmitted character codes.
Logic 0 is at HIGH level (“ SPACE” ) and logic
1 is at LOW level (“ MARK” ).
TTY-TXD return:
Refer to TTY-TXD.
4
GND
-
GND
-
Ground.
5
RXD
I
TTY-RXD
return
-
RXD:
Serial ASCII data input to the printer. It
maintains “MARK”
state (“ LOW level)
between received character codes.
TTY-TXD return:
Refer to TTX-RXD.
6
N.C.
-
TTY-TXD
O
TTY-TXD:
Serial ASCII data output from the printer.
The logic is determined by the impedance
between pins 3 and 6.
Logic 0 is high impedance (“ SPACE” ) at
current off and logic 1 is low impedance
(“MARK”) at current on.
It maintains “ MARK”
state (LOW level)
between transmitted character codes
7
N.C.
-
N.C.
-
Not connected.
8
N.C.
I
TTY-RXD
I
TTY-RXD:
Serial ASCII data input to the printer.
The logic is determined by the impedance
between pins 5 and 8.
Logic 0 is high impedance (“ SPACE” ) when
current is off and logic 1 is low impedance
(“ MARK” ) when current is on.
It maintains “ MARK”
state (LOW level)
between transmitted character codes
EPL-N1200 Service Manual
General Description
Rev. A
1-19