C-2
Appendix C—Parallel Interface
DATA
The host computer sends each data byte to the printer in parallel across
Data Lines 1 through 8 (connector Pins 2 through 9). A bit set to logical
"1" is transmitted as a high signal; a bit set to logical "0" is transmitted as
a low signal.
Input data and all interface control signals are compatible with TTL
(Transistor-Transistor Logic) levels, 0 to +5 volts.
SYNCHRONIZATION
Synchronization is accomplished by externally supplied STROBE* pulses.
The port receives data prior to the leading (negative) edge of STROBE*.
HANDSHAKING
Handshaking is accomplished by ACKNLG* (acknowledge) and BUSY
signals. These signals control data flow across the parallel interface.
The computer monitors the state of BUSY to determine if the printer is
ready to accept a character. If BUSY is not asserted, the computer sends
a character to the interface on DATA 1 through DATA 8.
After the data setup time, the computer asserts STROBE*. As each
character is received, the leading (negative) edge of STROBE* clocks the
BUSY flipflop, which resets it. This asserts the BUSY signal and latches
the received character into the parallel port register.
When the printer has processed the character and is ready for another, it
sets the BUSY flipflop. This negates the BUSY signal and produces a 5
m
s ACKNLG* pulse. The interface is ready to accept another character as
soon as the ACKNLG* pulse begins.
* The asterisks following a signal name signifies that logic 1 is an active low.
Содержание PowerLite 4100
Страница 1: ...4100 PRINTER OPERATOR S GUIDE Part No 066 00428 02 February 12 1998 Rev F ...
Страница 2: ...ii Contents ...
Страница 22: ...xxii Contents ...
Страница 42: ...20 Basics ...
Страница 43: ...Operations COMMON OPERATIONS LOADING PAPER JB0 AF1 Loading Paper ...
Страница 46: ...24 Operations Do not let paper drag on edge of stand table or desk Front Feed JB0 AG2 Bottom Feed JB0 AH1 ...
Страница 60: ...38 Operations JB0 AN Printout of IBM 1 U S Character Set Factory Default for IBM Emulation ...
Страница 61: ...Operator s Guide 39 JB0 AO Printout of DEC U S Multilingual Character Set Factory Default for DEC Emulation ...
Страница 126: ...106 Maintenance ...
Страница 189: ...Operator s Guide 169 EXAMPLE 3 This example shows how to define and download a near letter quality character AB0 ZA ...
Страница 191: ...Operator s Guide 171 Use the matrixes below to design your characters AB0 AA1 ...
Страница 196: ...176 Universal Control Commands ...
Страница 240: ...220 Epson FX 100 Control Commands ...
Страница 276: ...256 IBM Proprinter Control Commands ...
Страница 365: ...Operator s Guide B 19 INTERFACE CIRCUITS Version 1 JB0 BP1 ...
Страница 366: ...B 20 Appendix B Serial Interface Version 2 JD0 DS ...
Страница 374: ...C 8 Appendix C Parallel Interface INTERFACE CIRCUITS JB0 BQ2 ...
Страница 383: ...Operator s Guide D 9 Main Character Library Upright Draft Characters JB0 BG1 ...
Страница 384: ...D 10 Appendix D Character Sets Main Character Library Upright NLQ Characters JB0 BH1 ...
Страница 423: ...Operator s Guide D 49 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F ...
Страница 426: ...D 52 Appendix D Character Sets ...
Страница 450: ......