Zebra GK420d User's Guide Page 31
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19
Getting Started
Connecting your Printer to a Computer
8/4/10 GK420d™ User Guide 980608-001 Rev. C
Serial Communications
The printer automatically detects and switches the serial port to match common serial port
cabling and signal connection configurations for DTE and DCE communications. The required
cable must have a nine-pin “D” type (DB-9P) male connector on one end which plugs into the
mating (DB-9S) serial port located on the back of the printer. The other end of this signal
interface cable connects to a serial port on the host computer. This allows for the use of two
common cable types and drop-in replacement for Zebra and other printer models. Zebra
®
printers use a Null Modem (cross-over) cable. Early models of Zebra
®
printers (a DCE device)
running the EPL programming utilized a straight through (no cross-over) signal connections
cable. For pinout information, refer to Appendix A.
The serial port communication settings between the printer and host (typically a PC) must
match for reliable communication. The Bits per second (or Baud rate) and Flow control are the
most common settings that get changed. The host (typically a Windows PC) needs to have the
data Flow control changed to match the printer’s default communication method: Hardware
and is noted by the Host Handshake setting DTR/Xon/Xoff for legacy printer. This
combined hardware (DTR) and software (Xon/Xoff) mode may need to change depending
upon the non-Zebra application software and the serial cable variation in use.
Serial communications between the printer and the host computer can be set by:
• Autobaud synchronization
• ZPL programming ^SC command
• EPL programming Y command
• Resetting the printer to its default printer configuration.
Autobaud
Autobaud synchronization allows the printer to automatically match the communication
parameters of the host computer. To autobaud:
1. Press and hold the feed button until the green status LED flashes once, twice, and then
three times.
2. While the status LED flashes, send the ^XA^XZ command sequence to the printer.
3. When the printer and host are synchronized, the LED changes to solid green. (No labels
will print during autobaud synchronization.)
ZPL ^SC Command
Use the Set Communications (^SC) command to change the communications settings on the
printer.
1. With the host computer set at the same communications settings as the printer, send the
^SC command to change the printer to the desired settings.
2. Change the host computer settings to match the new printer settings.
Refer to the ZPL Programming Guide for more information about this command.
- User Guide 1
- GK420d™ 1
- FCC Compliance Statement 4
- Environmental Management 4
- About This Document 5
- Who Should Use This Document 6
- Contacts 7
- Document Conventions 8
- Contents 9
- Introduction 13
- GK Series Thermal Printers 14
- What’s in the Box? 15
- Your Printer 16
- Opening the printer 16
- Printer Features 17
- Operator Controls 18
- Power Switch 18
- Feed Button 18
- Status Light 19
- Closing the printer 20
- Getting Started 21
- Attaching Power 22
- Preparing Media 23
- Loading Roll Media 24
- Under Media 25
- Pre-install Windows 27
- Printer Drivers 27
- Serial Port and Windows 28
- operating systems 28
- Ethernet 28
- Interface Cable Requirements 29
- USB Interface Requirements 30
- Serial Communications 31
- Serial Cable 32
- Parallel Port 33
- Print Operations 37
- Thermal Printing 38
- Modes of Printing 39
- Print Media Types 39
- Replacing Supplies 41
- Adjusting the Print Width 41
- Adjusting the Print Quality 42
- Media Sensing 43
- Printing on Fan-Fold Media 44
- Fonts and Your Printer 47
- Stand Alone Printing 49
- Sending Files to the Printer 50
- Print Meter 50
- EPL Line Mode 50
- Printer Options 51
- Label Dispenser Option 52
- ZebraNet 55
- KDU — Printer Accessory 57
- Max. Current 58
- Maintenance 61
- Cleaning 62
- Cleaning the Printhead 63
- Media Path Considerations 64
- Sensor Cleaning 65
- Other Printer Maintenance 67
- Replacing the Printhead 68
- Troubleshooting 71
- Status Light Descriptions 72
- 6. The printer is paused 74
- No print on the label 75
- Print Quality Problems 76
- Manual Calibration 78
- Recalibration 79
- Communications Diagnostics 80
- Feed Button Modes 82
- Appendix: Interface Wiring 85
- Parallel Interface 87
- Ethernet Interface 88
- Serial Port Interface 89
- Appendix: Dimensions 91
- All dimensions are 92
- Label Dispenser 93
- Appendix: ZPL 95
- Configuration 95
- Command Name Description 101
- Notes • 102
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