Epson EPL-N2000, Service Manual

Page: 36 / 188

1.3.2 Serial Interface Specifications ( LocalTalk/Serial Module)
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Type: RS-232C/current loop
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Transfer system: Full duplex
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Transfer speed: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 bps
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Synchronization: Asynchronous start-stop system
Start-bit: 1 bit
Stop-bit: 1 or 2 bits
Data length: 7 or 8 bits
Parity: Odd, even, or none
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Protocol: DTR/RTS *
1
, X-ON/X-OFF , or robust mode *
2
*1: Cannot be combined with X-ON/X-OFF )
*2: Sends an X-ON a second when the printer is ready to receive
data.
Table 1-17. Serial Interface Pin Assignments
Pin No.
RS-232C Current Loop
Signal I/O Signal I/O
1 DTR O NC —
2 CTS I NC —
3 TXD O TTY-TXD return I
4 GND — GND —
5 RXD I TTY-RXD return O
6 NC — TTY-TXD O
7 NC — NC —
8 NC — TTY-RXD I
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Signal descriptions
DTR Signal output by the printer. When the DTR signal is HIGH, the printer can
receive the RXD signal. When the SelecType settings do not specify DTR
control, the signal level remains HIGH while printer power is on. When
SelecType is used for DTR control, DTR goes LOW for any error condition.
Data (RXD) from the host computer must be stopped within 128 characters
after DTR goes LOW.
CTS Always ignored.
TXD Serial ASCII data output by the printer. It remains in MARK state (LOW
level) between transmitted character codes. Logic 0 is at HIGH level
(SPACE), and logic 1 is at LOW level (MARK).
GND Connected to the printer chassis. The printer chassis GND and signal GND
are connected to each other.
RXD Serial ASCII data input to the printer. It maintains the MARK state (LOW
level) between received character codes.
Product Description EPL-N2000 Service Manual
1-24 Rev. A