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• THE SERIAL INTERFACE(OPTlONAL)<br />
Your printer uses either an RS-232C level or 20mA current loop<br />
to provide serial communication with your computer. (See the circuit<br />
diagrams contained in Figure H-3.) Using either interface, it can<br />
transfer from 150 to 9,600 bits per second. However, the printer can<br />
communicate at 19,200 bits per second using only an RS-232C level<br />
interface. Its word length is:<br />
01 start bit<br />
07 or 8 data bits (selectable)<br />
01 or 2 stop bits (selectable)<br />
@Odd, even or no parity (selectable)<br />
-<br />
You can select from the following four “handshake” modes:<br />
WSerial BUSY, l-byte mode<br />
@Serial BUSY, l-block mode<br />
.ACK mode<br />
• XON/XOFF mode<br />
A mark or ON (logical 1) generates a signal of -3V to -15V. A space<br />
or OFF (logical 0) generates a signal of + 3V to + 15V.<br />
Line Driver<br />
[MCl488L, 75189<br />
or equivalent]<br />
TTY -TX D<br />
Optcoupler<br />
TTY-TXDR<br />
-.<br />
Line Receiver<br />
(MC1489L. 75189<br />
or equivalent 1<br />
I - TTY-RXD<br />
q=I;-j<br />
Optcoupler<br />
TTY-RXDR<br />
[For RS232Cl<br />
[For 20mA Current Loop]<br />
Figure H-3. Circuit diagrams of the serial interface.<br />
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