3.3.3
Bidirectional
Centronics
Interface
1. Overview
This SIDM printer is equipped with a parallel Centronics interface which is located on
the main electronic pcb. The data transfer handshake (with some smaller exceptions)
has been implemented according IEEE1284 standard. Up to now (13.12.95) only the
Nibble Mode was implemented (Bytemode, ECP-Mode and EEP mode may follow
later per request). The Nibble Mode has been adapted to meet the requirements
Microsoft Windows (TM) Operating System which does a printer identification using
“Plug’n’Play”.
2 Detailed description of data transfer in Nibble Mode
The transmission of printer identification is divided into two parts. In the first phase
there is a “negotiation” between PC and printer to activate Nibble Mode. In the
second phase there is a data transfer. At the end of each phase there is a reentry to
to the normal Centronics mode according a defined handshake procedure. The name
“Nibble Mode” in this case means that the transmission is performed in two packages
per 4 bit in direction to the PC using existing control lines (bit 0/4=Error, Bit
1/5=Select, Bit 2/6=Paper-End, Bit 3/7=Busy). All other possible modes are using the
8 standard data lines - now in the opposite direction (printer - PC)
2.1 Phase 1, Negotiation phase
Procedure
–
The PC sets SELECTIN to high and at the same time AUTOFEED to low.
–
The printer reacts within 35ms with SELECT, ERROR and PAPEREND to high
but DONE to low
–
PC transmits one data byte to the printer with a STROBE signal and sets
AUTOFEED to high
–
This byte will be analyzed by the printer. If all seems to be ok this byte should be
00hex witch means the PC likes to know whether or not the printer is supporting
Nibble Mode.
–
Since the printer is able to run Nibble Mode the printer answers then with
SELECT, ERROR and PAPEREND to low. To create an interrupt at PC side,
DONE will be set to high at the end.
–
Now the termination of the negotiation phase will be done by setting SELECTIN
to low.
–
As a result the printer is setting SELECT and BUSY to high and after a short
delay also SELECTIN to low.
–
As a reaction AUTOFEED is set to low at PC side.
–
The printer is now setting ERROR and SELECT in normal Centronics mode
according the actual state and after that DONE is changed back again to high.
–
PC should react then setting AUTOFEED signal to high
–
As the very end of this negotiation phase the printer sets BUSY and DONE in
normal
–
Centronics mode according the actual state.
–
Now everything is in normal state.
Electronic Functions
Functional Description
3-22
Содержание 2265+
Страница 1: ...T2265 SprintPro T2280 SprintPro 2265 Maintenance manual Matrix printer 2280 ...
Страница 2: ...This page intentionally left blank ...
Страница 8: ...This page intentionally left blank ...
Страница 10: ...This page intentionally left blank ...
Страница 20: ...This page intentionally left blank ...
Страница 32: ...right mark mark mark Mechanical Functions Functional Description 3 12 ...
Страница 36: ...Electronic Functions Functional Description 3 16 2265 2280 Electronic groups ...
Страница 37: ...T2265 T2280 Electronic groups Functional Description Electronic Functions 3 17 ...
Страница 66: ...This page intentionally left blank ...
Страница 123: ...Adjustments Mechanical Adjustments 6 5 ...
Страница 125: ...Adjustments Electrical Adjustments 6 7 ...
Страница 132: ...Housing Spare Parts and Schematics 7 2 7 1 Housing ...
Страница 134: ...Basic Printer Spare Parts and Schematics 7 4 7 2 1 Basic Printer 1 3 ...
Страница 135: ...Basic Printer 2 3 Spare Parts and Schematics Basic Printer 7 5 ...
Страница 136: ...Basic Printer 3 3 Basic Printer Spare Parts and Schematics 7 6 ...
Страница 137: ...Spare Parts and Schematics Basic Printer 7 7 7 2 2 2265 2280 72 125 138 139 136 62 11 137 ...
Страница 141: ...This page intentionally left blank ...
Страница 142: ...7 3 Standard Tractor Assy Standard Tractor Assy Spare Parts and Schematics 7 12 ...
Страница 152: ...7 8 PMS Double Sensor PMS mechanic PMS Double Sensor Spare Parts and Schematics 7 22 ...
Страница 154: ...7 10 Option Recogition Option Recogition Spare Parts and Schematics 7 24 ...
Страница 156: ...Modular Interfaces Spare Parts and Schematics 7 26 7 12 Modular Interfaces 7 12 1 Serial I O Option ...
Страница 159: ...Spare Parts and Schematics Modular Interfaces 7 29 7 12 2 Current Loop Interface 20 mA ...
Страница 160: ...Serial Interface Spare Parts and Schematics 7 30 7 13 Serial Interface RS422 V11 Interface Option ...
Страница 164: ...8 3 Spare Parts and Schematics Sheet Feeder Mechanic Spare Parts and Schematics 8 4 ...
Страница 166: ...8 4 ASF Sheetfeeder Gear Block 1 2 3 4 5 3x 6 7 2x 8 2x Sheet Feeder Mechanic ASF Sheetfeeder Gear Block 8 6 ...
Страница 168: ...This page intentionally left blank ...
Страница 172: ...10 2 Tractor Complete 14 Rear Tractor 2T Model Tractor Complete 10 2 ...
Страница 174: ...This page intentionally left blank ...
Страница 176: ...14 6 4 12 1 5 6 11 7 13 7 8 17 2 9 3 16 15 4 Cutting Device Option Specifications 11 2 ...
Страница 178: ...This page intentionally left blank ...
Страница 179: ...12 2nd Front Tractor option 2nd Front Tractor option 12 1 ...
Страница 181: ...Color Option 13 1 13 Color Option T2265 and T2280 only ...
Страница 183: ...Printer Stand Overview 14 1 14 Printer Stand 14 1 Overview ...
Страница 184: ...Installing the Printer Stand Printer Stand 14 2 14 2 Installing the Printer Stand 1 2 3 4 ...
Страница 185: ...Printer Stand Installing the Printer Stand 14 3 6 8 7 5 ...
Страница 186: ...Installing the Printer Stand Printer Stand 14 4 9 10 ...
Страница 188: ...This page intentionally left blank ...