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.
Summary of Contents for PowerLite 4100
Page 1: ...4100 PRINTER OPERATOR S GUIDE Part No 066 00428 02 February 12 1998 Rev F ...
Page 2: ...ii Contents ...
Page 22: ...xxii Contents ...
Page 42: ...20 Basics ...
Page 43: ...Operations COMMON OPERATIONS LOADING PAPER JB0 AF1 Loading Paper ...
Page 60: ...38 Operations JB0 AN Printout of IBM 1 U S Character Set Factory Default for IBM Emulation ...
Page 126: ...106 Maintenance ...
Page 191: ...Operator s Guide 171 Use the matrixes below to design your characters AB0 AA1 ...
Page 196: ...176 Universal Control Commands ...
Page 240: ...220 Epson FX 100 Control Commands ...
Page 276: ...256 IBM Proprinter Control Commands ...
Page 365: ...Operator s Guide B 19 INTERFACE CIRCUITS Version 1 JB0 BP1 ...
Page 366: ...B 20 Appendix B Serial Interface Version 2 JD0 DS ...
Page 374: ...C 8 Appendix C Parallel Interface INTERFACE CIRCUITS JB0 BQ2 ...
Page 383: ...Operator s Guide D 9 Main Character Library Upright Draft Characters JB0 BG1 ...
Page 384: ...D 10 Appendix D Character Sets Main Character Library Upright NLQ Characters JB0 BH1 ...
Page 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 ...
Page 426: ...D 52 Appendix D Character Sets ...
Page 450: ......