Home » Lexmark Manuals » Multifunction Devices » Lexmark MX826 » Manual Viewer

Lexmark MX826 Printer Languages and Interfaces Technical Reference - Page 143

DTR and DTR/DSR protocol timing RS-232C, XON/XOFF protocol timing RS-232C

Add to My Manuals
Save this manual to your list of manuals

Page 143 highlights

Printer interfaces 143 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. 1 2 RXD 3 Receive Data Valid 4 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, then data could be lost. XON/XOFF protocol timing (RS-232C) When you select this data flow control protocol, the printer sends an XOFF signal when it detects the following busy conditions: • Buffer full • Attendance error • Printer not in ready state The following diagram illustrates XON/XOFF Protocol Timing.

Section	Page
Contents	3
Introduction	5
Overview	5
Printer Control Language (PCL) emulation	6
Selecting PCL emulation	6
Page formatting	6
Print Area menu	6
Command structure	8
Control codes	8
Commands	8
PCL emulation commands	10
PCL emulation commands by function	10
GL/2 commands	32
Raster image graphics	34
Raster compression mode	34
Creating macros	39
Printer job language	41
PJL command notation	41
Kernel commands	41
Job separation commands	42
Environment commands and variables	43
Common variables for both printer languages	43
Common variables for PCL emulation	51
Printer-unique variables for PCL emulation	52
Common variables for PostScript emulation	54
Printer-unique variables for PostScript emulation	54
Printer-unique LRESOURCE variables	55
Auto-continuable conditions	55
Attendance conditions	65
Status message format	80
Informational messages	80
Service errors	81
Device attendance commands	81
Unique PJL commands	81
File commands for flash memory or hard disk	84
File and device protection commands	87
File and device protection commands	87
Unlocking a protected file or device command	88
Relocking a protected file or device command	89
Unlocking a protected file or device for a current job command	89
Recovering lost passwords	89
PostScript emulation	91
Selecting PostScript emulation	91
Supported paper size in PostScript	91
PostScript emulation supplemental operators	91
Paper tray support	91
Envelope size and tray support	93
Interpreter parameters	93
User parameters	93
System parameters	96
Device parameters	100
Status and error messages	121
Tagged Binary not active	121
Tagged Binary active	122
Status messages	122
Switching languages	123
SmartSwitch	123
Setting SmartSwitch for different interfaces	123
Datastream	123
Sniffing	123
Default printer language for an interface port	124
Flash memory and hard disk	125
Resource data collection (download target)	125
Resource Data Collection command	125
Storing resources on a flash memory or hard disk	125
Viewing the contents of a flash memory or hard disk	126
Example of directory	126
Password protection	128
Rewriting the flash memory content	128
Accessing files with PostScript emulation	129
File naming conventions	129
Device search order	131
Performance	132
Job buffering	132
Creating a partition	132
Enabling job buffering	132
Disabling job buffering	132
Recovering from a power loss	132
Printer interfaces	133
Setting up the communications port	133
Choosing an interface	133
Parallel interface	134
Standard parallel connector	134
INIT* signal	134
Computer-to-printer communications	134
Printer-to-computer communication (Advanced Status)	137
Parallel Mode 1	138
Parallel Mode 2	138
Serial interface	138
Using the RS-232C serial interface	139
Network support	145
Input buffer	145

Match case Limit results 1 per page

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.

Receive Data Valid

RXD

The RTS signal is driven active as long as power is supplied to the printer.

The DTR signal becomes active when initialization is complete, telling the computer that the printer is ready

to receive data.

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.

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, then data could be lost.

XON/XOFF protocol timing (RS-232C)

When you select this data ﬂow control protocol, the printer sends an XOFF signal when it detects the following

busy conditions:

•

Buﬀer full

•

Attendance error

•

Printer not in ready state

The following diagram illustrates XON/XOFF Protocol Timing.

Printer interfaces

143