Table 1-11. Localtalk Interface Pin Assignments - Epson EPL-N1200 Service Manual

EPL-N1200 Service Manual
1.3.3 Optional LocalTalk Interface (LocalTalk/Serial Module)
The optional LocalTalk/Serial module contains LocalTalk interface with the following characteristics.
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: 230.4 K BPS
Signal description: See Table 1-11.

Table 1-11. LocalTalk Interface Pin Assignments

Pin No. Signal Name I/O
1
DTR
2
CTS
3
TXD-
4
GND
5
RXD-
6
TXD+
7
N.C.
8
RXD+
Rev. A
Signal output by the printer. When the DTR signals HIGH, the RXD
O
signal can be received by the printer.
I The printer transmits the data through TXD while CTS is HIGH.
Serial ASCII data output from the printer.
HIGH level: when SD+ voltage is higher than SD- voltage.
O LOW level: when SD+ voltage is less than SD- voltage.
Logic 0 " SPACE" and logic 1 " MARK" must be maintained between
-
Serial ASCII data input from computer.
HIGH level: when RD+ voltage is higher than RD- voltage.
I LOW level: when RD+ voltage is less than RD- voltage.
Logic 0 " SPACE" and logic 1 " MARK" must be maintained between
O
-
I
Description
transmitted character codes.
Ground.
transmitted character codes.
Refer to TXD-.
Not connected.
Refer to RXD-.
General Description
1-21