Lexmark C762 User Manual Page 317
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Interfaces
8-25
DTR and DTR/DSR Protocol Timing (RS-232C)
Use DTR to pace the data flow from the computer. DTR goes from high to low to
indicate to the computer that the printer cannot receive more data when it detects the
following BUSY conditions:
• Buffer full
• Attendance error
• Printer not in ready state
The following diagram illustrates DTR Protocol Timing.
Legend:
1 The RTS signal is driven active as long as power is supplied to the printer.
2 The DTR signal becomes active when initialization is complete, telling the computer that
the printer is ready to receive data.
3 When Honor DSR is On, the printer considers data received invalid when DSR is low
and discards the data. Only DTR/DSR is used for flow control from the printer to the host
computer.
4 DTR drops to tell the computer that the receive buffer is nearly full or that the printer is
busy and that data transmission should stop. About 640 free bytes remain in the buffer at
this time. If the computer continues to send data after the printer has sent a low DTR
signal, data could be lost.
Receive Data Valid
1
3
4
2
- Technical Reference 1
- Edition: March 2006 2
- Contents 4
- CHAPTER 1: Introduction 8
- Introduction 10
- Navigational Tips 11
- Printing the File 11
- Bibliography 12
- CHAPTER 2: PCL Emulation 13
- Using Your Software Program 14
- Page Formatting 15
- Lexmark C760 and C762 16
- Print Area Menu Item 17
- Physical 19
- Standard PCL Emulation Fonts 21
- Type 1 Fonts 23
- Specialty PCL Fonts 25
- 19 symbol sets 41
- Command Structure 43
- Command Parameters 44
- 1B 28 73 31 36 2E 36 36 48 45
- 27 40 115 49 54 46 54 54 72 45
- PCL Emulation Commands 46
- Table 2-12: Page Control 48
- Table 2-13: Alphanumeric ID 52
- 'd' ascii 52
- Table 2-15: Font Selection 54
- Table 2-17: Font Creation 57
- Table 2-18: Macros 57
- Table 2-19: Print Model 58
- Table 2-22: Raster Graphics 61
- Table 2-23: Color Extensions 64
- Table 2-24: Status Readback 66
- Table 2-25: Picture Frame 67
- GL/2 Commands 68
- Table 2-28: Vector Group 69
- Table 2-29: Polygon Group 69
- Table 2-30: Character Group 70
- Raster Image Graphics 72
- Uncoded Data 73
- Delta Row 75
- Adaptive Compression 76
- Additional Compression Modes 78
- PJL Command Notation 80
- Kernel Commands 81
- ENTER LANGUAGE Command 82
- COMMENT Command 82
- Job Separation Commands 83
- EOJ Command 85
- DEFAULT Command 87
- SET Command 88
- INITIALIZE Command 90
- RESET Command 90
- Pages as follows: 94
- -128 to 127 0 113
- Waiting message 121
- ESET PRINTER is not 122
- -10 to 10 0 122
- [command modifier:value] 127
- LPARM:PCL. For example: 127
- Variable Function Selections 131
- Factory 131
- Status Readback Commands 133
- ECHO Command 134
- INFO Command 135
- INQUIRE Command 137
- USTATUS Command 138
- USTATUSOFF Command 139
- Status Message Format 140
- Auto-Continuable Conditions 142
- Attendance Conditions 146
- Close Duplex Door FALSE 151
- Insert Duplex Option FALSE 151
- Load Staples FALSE 151
- Table 3-16: Tray Codes 153
- Table 3-17: Media Size Codes 153
- Device Attendance Commands 159
- OPMSG Command 160
- STMSG Command 160
- Unique PJL Commands 161
- LESCAPECHAR Command 162
- PORT parameter 163
- LFAX PHONENUMBER Command 164
- LDOWNLOADTARGET Command 165
- LOPENFILE Command 168
- LCLOSEFILE Command 168
- LREADFILE Command 169
- LWRITEFILE Command 170
- LRUNFILE Command 170
- LRENAMEFILE Command 171
- LDELETEFILE Command 171
- LFORMAT Command 171
- LDEFRAG Command 171
- Protecting a File or Device 172
- Password for an Entire Device 173
- Recovering Lost Passwords 177
- PostScript 178
- Page Device Parameters 225
- Interpreter Parameters 239
- Status and Error Messages 269
- SmartSwitch 271
- Printer Job Language 272
- Sniffing 273
- Download Target 275
- Resource Save is set 275
- 3 Set Download Target to RAM 276
- Example of Directory 277
- Part Number 278
- Write Password Protected 278
- Password Protection 280
- Rewriting the Flash Content 281
- File Naming Conventions 282
- Filenames 283
- Filename Extensions 283
- myfont.type1. The 284
- Device Search Order 285
- Performance 286
- Job Buffering 286
- Creating a Partition 287
- Enabling Job Buffering 287
- Disabling Job Buffering 288
- Recovering from a Power Loss 288
- Specifications 289
- CHAPTER 8: Printer Interfaces 293
- Interfaces 294
- Parallel Interface 299
- Network Support 320
- Input Buffer 321
- APPENDIX A: PCL Support 323
- PCL Support 324
- APPENDIX B: PJL Support 332
- PJL Support 333
- PostScript Support 365
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