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Lexmark 21Z0294 Technical Reference - Page 309

Standard Protocol Data Transfer Sequence

UPC - 734646313247

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8-7 Interfaces • Uses standard transistor-transistor logic (TTL) levels for all interface control signals and input data. Interface conditions are based on TTL levels. All printer outputs are totem-pole TTL devices. All printer input/output (I/O) are devices with an internal pull-up resistor to 5 V. Rise and fall times of each signal must be less than 1,500 nanoseconds (ns) without slope reversal. Standard Protocol Data Transfer Sequence The following illustration shows the typical data transfer sequence on the parallel interface. See Table 8-1 for typical parallel interface timings on the parallel interface. DATA1-8 STROBE* BUSY ACK* AB C D G F E

Section	Page
Contents	3
CHAPTER 1: Introduction	7
Overview	7
Bibliography	10
CHAPTER 2: PCL Emulation	11
Selecting PCL Emulation	11
Using SmartSwitch	11
Using the Printer Control Panel or MarkVision Professional	11
Using Your Software Program	12
Page Formatting	12
Printable Areas	12
Lexmark C935	13
Lexmark X940e and X945e	15
Print Area Menu Item	17
Font and Symbol Set Support for the Lexmark C935, X940e, and X945e	19
Forward and Backward Compatibility Modes for the Lexmark C935, X940e, and X945e	20
Selecting Symbol Sets for LexmarkC935, X940e, and X945e	24
Command Structure	59
Control Codes	59
Commands	60
PCL Emulation Commands	63
PCL Emulation Commands by Function	63
GL/2 Commands	85
Raster Image Graphics	89
Raster Compression Mode	89
Macros	96
CHAPTER 3: Printer Job Language	97
PJL Command Notation	97
Kernel Commands	98
Job Separation Commands	100
Environment Commands and Variables	103
Common Variables for PCL Emulation	136
Status Readback Commands	142
Status Message Format	149
Information Messages	149
Auto-Continuable Conditions	151
Attendance Conditions	155
Operator Intervention - Paper Handling	160
Operator Intervention - Paper Jams	163
Service Errors	167
Device Attendance Commands	168
Unique PJL Commands	170
File Commands for Flash or Disk	174
File and Device Protection Commands	181
Protecting a File or Device	181
Unlocking a Protected File or Device	183
Re-Locking a Protected File or Device	184
Unlocking a Protected File or Device for the Current Job	185
Recovering Lost Passwords	186
CHAPTER 4: PostScript Emulation	187
Selecting PostScript Emulation	187
Using SmartSwitch	187
Using the Printer Control Panel or MarkVision Professional	187
Using Your Software Program	188
Paper Tray Support	190
Envelope Size Support	195
Envelope Tray Support	197
Supplemental Operator Summary	199
Page Device Parameters	234
Interpreter Parameters	248
User Parameters	248
System Parameters	251
Device Parameters	257
Status and Error Messages	278
Tagged Binary Not Active	278
Tagged Binary Active	278
Status Messages	279
CHAPTER 5: Switching Languages	280
SmartSwitch	280
Setting SmartSwitch for Different Interfaces	281
Printer Job Language	281
Sniffing	282
CHAPTER 6: Flash Memory and Disk	283
Resource Data Collection (Download Target)	284
Storing Resources on Flash Memory or Disk	285
Viewing the Contents of Flash Memory and Disk	285
Password Protection	289
Rewriting the Flash Content	290
Accessing Files with PostScript Emulation	291
File Naming Conventions	291
Device Search Order	294
Performance	295
Job Buffering	295
Creating a Partition	296
Enabling Job Buffering	296
Disabling Job Buffering	297
Recovering from a Power Loss	297
CHAPTER 7: Printer Specifications	298
Airflow Requirement	298
Noise Emission Levels	298
Electrical Specifications	299
Power Requirements	299
Physical Specifications	300
Clearance Requirements	301
Environmental Conditions	302
Altitude Specifications	302
Atmospheric Pressure	302
CHAPTER 8: Printer Interfaces	303
Setting Up the Communications Port	304
Setting Up the Communications Port	304
Deciding Which Interface to Use	305
Parallel Interface	305
Standard Parallel Connector	306
Using the INIT* Signal to Initialize	307
Computer-to-Printer Communications	307
Printer-to-Computer Communication (Advanced Status)	311
Parallel Mode 1	312
Parallel Mode 2	312
Using the RS-232C Serial Interface	313
Network Support	322
Input Buffer	323
APPENDIX A: PCL Support	325
APPENDIX B: PJL Support	334
APPENDIX C: PostScript Support	365