Service manual

1.3.3 Optional LocalTalk Interface ( LocalTalk/Serial Modelu)
This printer can use an optional LocalTalk interface module.
Type: LocalTalk
Signal level: Same as RS-422 signal level
Protocol: X-ON/X-OFF (cannot be combined with DTR control)
DTR control (cannot be combined with X-ON/X-OFF)
Transfer speed: 230.4K bps
Table 1-18. LocalTalk Interface Pin Assignments
Pin No. Signal Name I/O Description
1
DTR
OUT
Signal output by the printer. When the DTR signal is HIGH, the
printer can receive the RXD signal.
2
CTS
IN
The printer transmits data through TXD while CTS is HIGH.
3
TXD–
OUT
Serial ASCII data output from the printer. At a HIGH level
when SD+ voltage is higher than SD– voltage. At a LOW level
when SD+ voltage is less than SD– voltage. Logic 0 is SPACE
and logic 1 is MARK . The state must be maintained between
transmitted character codes.
4
GND
—
Ground.
5
RXD–
IN
Serial ASCII data input from computer. At a HIGH level when
RD+ voltage is higher than RD– voltage. At a LOW level when
RD+ voltage is less than RD– voltage. Logic 0 is SPACE and
logic 1 is MARK. The state must be maintained between
transmitted character codes.
6
TXD+
OUT
Refer to TXD–.
7
NC
—
Not connected.
8
RXD+
IN
Refer to RXD–.
Product Description EPL-N2000 Service Manual
1-26 Rev. A