Epson EPL-N1200 Service Manual - Page 33
Optional LocalTalk Interface LocalTalk/Serial Module, Table 1-11., LocalTalk Interface Pin
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EPL-N1200 Service Manual General Description 1.3.3 Optional LocalTalk Interface (LocalTalk/Serial Module) The optional LocalTalk/Serial module contains LocalTalk interface with the following characteristics. Type: Signal level: Protocol: Transfer speed: Signal description: LocalTalk Same as RS-422 signal level X-ON/X-OFF (cannot be combined with DTR control) DTR control (cannot be combined with X-ON/X-OFF) 230.4 K BPS See Table 1-11. Table 1-11. LocalTalk Interface Pin Assignments Pin No. Signal Name I/O Description 1 DTR O Signal output by the printer. When the DTR signals HIGH, the RXD signal can be received by the printer. 2 CTS 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. 3 TXD- O LOW level: when SD+ voltage is less than SD- voltage. Logic 0 " SPACE" and logic 1 " MARK" must be maintained between transmitted character codes. 4 GND - Ground. Serial ASCII data input from computer. HIGH level: when RD+ voltage is higher than RD- voltage. 5 RXD- I LOW level: when RD+ voltage is less than RD- voltage. Logic 0 " SPACE" and logic 1 " MARK" must be maintained between transmitted character codes. 6 TXD+ O Refer to TXD-. 7 N.C. - Not connected. 8 RXD+ I Refer to RXD-. Rev. A 1-21