B-14
Appendix B—Serial Interface
HANDSHAKING
Handshaking controls the data flow across the serial interface.
Control of the data flow is necessary because it is possible for computers
to send data faster than the printer can print. The printer contains a data
storage buffer to ease this potential problem, but data flow control is
necessary to totally eliminate the possibility of data loss.
The printer provides two kinds of handshaking:
•
Software
handshaking
•
Hardware
handshaking
SOFTWARE HANDSHAKING
Software handshaking occurs when a device controls data flow using the
content of the data itself.
The printer supports two software handshaking protocols:
•
X-ON/X-OFF
•
ETX/ACK
X-ON/X-OFF
X-ON/X-OFF is commonly used when printers control the handshake.
The printer accepts characters until its input buffer is nearly full, at which
time it initiates the handshake by sending a "turn-off" character, X-OFF,
back to the computer. When the computer receives this character, it
stops transmitting data. When the input buffer is nearly empty, the printer
sends a "turn-on" character, X-ON, to the computer. Upon receipt of this
character, the computer resumes sending characters.
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: ......