jwilly246/zpl
budtags/skills/zpl/SKILL.md
Use this skill when generating ZPL code, working with ZPL commands, creating Zebra printer labels, or troubleshooting ZPL syntax and formatting issues.
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SKILL.md
- name:
- zpl
- description:
- Use this skill when generating ZPL code, working with ZPL commands, creating Zebra printer labels, or troubleshooting ZPL syntax and formatting issues.
ZPL II Programming Language Skill
You are now equipped with comprehensive knowledge of the Zebra Programming Language (ZPL II). This skill provides instant access to the complete ZPL II Programming Guide, including all commands, programming techniques, and best practices for generating Zebra printer labels.
Your Capabilities
When the user asks about ZPL programming, you can:
- Generate ZPL Code: Create complete ZPL label templates with proper formatting
- Explain Commands: Reference exact syntax, parameters, and usage for any ZPL command
- Debug ZPL: Identify and fix common ZPL errors and formatting issues
- Design Labels: Help design label layouts with text, barcodes, graphics, and images
- Optimize Performance: Suggest best practices for efficient label printing
- Work with Barcodes: Generate 1D and 2D barcodes (Code 39, Code 128, QR codes, Data Matrix, etc.)
- Handle Graphics: Create boxes, circles, lines, and import images
- Program RFID: Write and encode RFID tags
- Provide Examples: Show real-world examples from the programming guide
Available Resources
This skill includes the complete ZPL II Programming Guide split into 37 easily-digestible markdown files:
Volume 1: Command Reference (23 files, ~8,348 lines)
Complete reference for all ZPL II commands with syntax, parameters, and examples.
Getting Started:
volume-1/00-front-matter.md- Copyright, table of contentsvolume-1/01-introduction.md- Getting started with ZPL IIvolume-1/02-basic-exercises.md- 5 hands-on exercises for beginners
Commands by Category:
- Fonts:
volume-1/03-commands-fonts.md- ^A, ^A@ font commands - Barcodes:
volume-1/04a-commands-barcodes-basic.md- Code 11, Code 39, Codabar, etc.volume-1/04b-commands-barcodes-upc-ean.md- UPC-A, UPC-E, EAN-8, EAN-13volume-1/04c-commands-barcodes-advanced.md- Code 93, Code 128, MSI, Plesseyvolume-1/04d-commands-barcodes-2d.md- QR Code, Data Matrix, Aztec, PDF417volume-1/04e-commands-barcodes-specialty.md- MaxiCode, RSS, POSTNET, TLC39
- Configuration:
volume-1/05-commands-config.md- Printer settings (^C* commands) - Downloads:
volume-1/06-commands-downloads.md- Fonts, graphics, formats (^D*, ~D*) - Fields:
volume-1/07a-commands-fields-basic.md- ^FO, ^FD, ^FS, ^FT (basic field operations)volume-1/07b-commands-fields-advanced.md- ^FB, ^FM, ^FP, ^FR, ^FV, ^FW (text blocks, mirroring, etc.)
- Graphics:
volume-1/08-commands-graphics.md- Boxes, circles, ellipses, lines (^GB, ^GC, ^GD, ^GE, ^GF) - Host Status:
volume-1/09-commands-host-status.md- Communication and status queries - Images:
volume-1/10-commands-images.md- Image download and management - System:
volume-1/11-commands-system.md- Job control, configuration - Labels/Media:
volume-1/12-commands-labels-media.md- Label layout, media handling - Network:
volume-1/13-commands-network.md- Network printer commands - Print:
volume-1/14-commands-print.md- Print control, quantity, speed - RFID:
volume-1/15-commands-rfid.md- RFID tag programming - Serial/Misc:
volume-1/16-commands-serial-misc.md- Serial, miscellaneous commands volume-1/17-back-matter.md- Index and contact information
Volume 2: Programming Guide (14 files, ~2,978 lines)
Programming concepts, techniques, advanced topics, and best practices.
Files:
volume-2/00-front-matter.md- Document conventions and organizationvolume-2/01-zpl-basics.md- ZPL II fundamentals and format structurevolume-2/02-programming-exercises.md- 6 progressive programming exercisesvolume-2/03a-advanced-stored-formats.md- Stored formats, serialization, variable datavolume-2/03b-advanced-control-commands.md- Advanced control techniquesvolume-2/03c-advanced-graphics-networking.md- Graphics handling and networkingvolume-2/04-fonts-barcodes.md- Font types, matrices, barcode implementationvolume-2/05-printer-configuration.md- Printer setup via ZPL IIvolume-2/06-xml-super-host-status.md- XML status reportingvolume-2/07-real-time-clock.md- RTC commands and date/time handlingvolume-2/08-mod-check-digits.md- Check digit calculation (Mod 10/43)volume-2/09-error-detection-protocol.md- Communication protocol and error handlingvolume-2/10-zb64-encoding.md- Base64 encoding for ZPLvolume-2/11-appendices.md- Character sets and reference tables
ZPL II Overview
Language Type: Label markup language for Zebra thermal printers Version: ZPL II (Zebra Programming Language II) Primary Use: Generating thermal printer labels with text, barcodes, graphics, and RFID Execution: Sent directly to Zebra printers via serial, parallel, USB, or network connection
Key Features:
- ✅ Human-readable ASCII command syntax
- ✅ Extensive barcode support (1D and 2D)
- ✅ Font management and scalable fonts
- ✅ Graphic primitives (boxes, circles, lines)
- ✅ Image download and printing
- ✅ RFID tag encoding
- ✅ Stored formats for variable data
- ✅ Real-time status reporting
Quick Reference Guide
Basic Label Structure
^XA // Start of label format
^FO50,50 // Field Origin (X=50 dots, Y=50 dots)
^A0N,50,50 // Font: scalable, normal orientation, height=50, width=50
^FDHello World^FS // Field Data with Field Separator
^XZ // End of label format
Key Commands:
^XA- Start label format^XZ- End label format^FO- Field Origin (positioning)^FD- Field Data (content)^FS- Field Separator (end of field)^A- Font selection^B- Barcode commands^GB- Graphic Box^GC- Graphic Circle
See: volume-2/01-zpl-basics.md for complete fundamentals
Find Commands by Function
Text & Fonts:
- Font selection:
^Acommands →volume-1/03-commands-fonts.md - Text blocks:
^FB→volume-1/07b-commands-fields-advanced.md - Field positioning:
^FO,^FT→volume-1/07a-commands-fields-basic.md
Barcodes:
- 1D barcodes (Code 39, Code 128):
volume-1/04a-04c-commands-barcodes-*.md - 2D barcodes (QR, Data Matrix):
volume-1/04d-commands-barcodes-2d.md - UPC/EAN:
volume-1/04b-commands-barcodes-upc-ean.md
Graphics:
- Boxes, circles, lines:
volume-1/08-commands-graphics.md - Images:
volume-1/10-commands-images.md
Label Layout:
- Label dimensions:
^LL,^LH→volume-1/12-commands-labels-media.md - Print quantity:
^PQ→volume-1/14-commands-print.md - Print speed:
^PR→volume-1/14-commands-print.md
Advanced:
- RFID:
volume-1/15-commands-rfid.md - Stored formats:
volume-2/03a-advanced-stored-formats.md - Serialization:
volume-2/03a-advanced-stored-formats.md
Find Commands by Prefix
| Prefix | Category | File Location | |--------|----------|---------------| | ^A* | Fonts | volume-1/03 | | ^B* | Barcodes | volume-1/04a-04e | | ^C* | Configuration | volume-1/05 | | ^D*, ~D* | Downloads | volume-1/06 | | ^F* | Fields | volume-1/07a-07b | | ^G* | Graphics | volume-1/08 | | ^H*, ~H* | Host Status | volume-1/09 | | ^I* | Images | volume-1/10 | | ^J*, ~J* | System | volume-1/11 | | ^L*, ^M* | Labels/Media | volume-1/12 | | ^N*, ~N* | Network | volume-1/13 | | ^P* | Print Control | volume-1/14 | | ^R* | RFID | volume-1/15 | | ^S*, ^T*, ^W*, ^X*, ^Z* | Serial/Misc | volume-1/16 |
Common ZPL Patterns
1. Simple Text Label
^XA
^FO50,50^A0N,30,30^FDProduct Name^FS
^FO50,100^A0N,25,25^FDSKU: 12345^FS
^FO50,150^A0N,20,20^FDPrice: $29.99^FS
^XZ
2. Label with Code 128 Barcode
^XA
^FO100,50^A0N,30,30^FDProduct Label^FS
^FO100,100^BY2^BCN,100,Y,N,N^FD123456789^FS
^XZ
See: volume-1/04c-commands-barcodes-advanced.md for Code 128 details
3. QR Code Label
^XA
^FO100,50^BQN,2,4^FDQA,QR Code Data Here^FS
^FO100,250^A0N,25,25^FDScan for info^FS
^XZ
See: volume-1/04d-commands-barcodes-2d.md for QR code details
4. Cannabis Compliance Label (BudTags Pattern)
^XA
^FO50,50^A0N,30,30^FD{{ product_name }}^FS
^FO50,100^A0N,25,25^FDStrain: {{ strain_name }}^FS
^FO50,150^BY2^BCN,80,Y,N,N^FD{{ package_tag }}^FS
^FO50,250^A0N,20,20^FDTHC: {{ thc_percent }}%^FS
^FO50,280^A0N,20,20^FDCBD: {{ cbd_percent }}%^FS
^FO50,310^A0N,20,20^FDHarvest: {{ harvest_date }}^FS
^XZ
Pattern: Uses Twig-style variables for template rendering
See: BudTags TemplateService and LabelMakerService for integration
5. Box and Graphics
^XA
^FO50,50^GB400,300,3^FS // Box: width=400, height=300, thickness=3
^FO100,100^A0N,30,30^FDBoxed Text^FS
^FO50,400^GC100,3^FS // Circle: diameter=100, thickness=3
^XZ
See: volume-1/08-commands-graphics.md for all graphic commands
BudTags Integration Context
How ZPL is Used in BudTags
Template System:
- Organizations create label templates using HTML/Twig (
TemplateService) - Visual ZPL Mapper annotates HTML elements with ZPL positioning (
data-zpl-*attributes) - Templates are rendered with package data from Metrc
- ZPL is generated from annotated templates (
ZplApiservice) - ZPL sent to Zebra printers via Browser Print JavaScript API
Key Files:
app/Services/Api/ZplApi.php- ZPL generation serviceresources/js/Components/LabelDesigner/CanvasLabelDesigner.tsx- Visual designerresources/js/Components/TemplateEditor/VisualZplMapper.tsx- ZPL annotation toolresources/js/utils/ZplGenerator.ts- ZPL generation utilitiesresources/js/utils/HtmlProcessor.ts- HTML to ZPL conversion
Output Modes:
- ZPL Mode: All values in dots (203 DPI), 1:1 screen pixel mapping
- HTML Mode: Positions in inches, font sizes in points (96 PPI display)
Coordinate System:
- Units: Dots (1/203 inch at 203 DPI)
- Origin: Top-left corner (0,0)
- X-axis: Horizontal (left to right)
- Y-axis: Vertical (top to bottom)
Typical BudTags ZPL Workflow
- Design: User creates label in visual designer
- Annotate: User clicks elements to add ZPL positioning
- Generate Template ZPL: System creates ZPL with Twig variables
- Preview: Mock data ZPL generated for Labelary preview
- Render: Template merged with actual package data
- Print: Final ZPL sent to Zebra printer
See: CLAUDE.md section "ZPL Integration & Visual Mapper" for complete architecture
Important ZPL Concepts
Coordinate System & Positioning
Field Origin (^FO): Sets the starting position for field data
^FO100,50 // X=100 dots, Y=50 dots from top-left
Label Home (^LH): Sets the reference point for all field origins
^LH30,30 // All ^FO coordinates now relative to (30,30)
See: volume-1/12-commands-labels-media.md for label positioning
Fonts & Text
Font Command (^A): Selects font for subsequent text
^A0N,30,30 // Font 0, Normal orientation, Height=30, Width=30
^A0R,50,50 // Font 0, Rotated 90°, Height=50, Width=50
Font Types:
^A0- Scalable font (recommended for flexibility)^Athrough^A9- Bitmap fonts^A@- Custom downloaded fonts
See: volume-1/03-commands-fonts.md for all font commands
Barcodes
1D Barcodes: Linear barcodes (Code 39, Code 128, UPC, etc.)
^BCN,100,Y,N,N // Code 128, height=100, print interpretation line
^FD12345^FS // Barcode data
2D Barcodes: Matrix barcodes (QR Code, Data Matrix, etc.)
^BQN,2,4 // QR Code, model 2, magnification 4
^FDQA,Data^FS // QR data with error correction
See: volume-1/04a-04e-commands-barcodes-*.md for complete barcode reference
Graphics & Images
Graphic Primitives:
^GB- Box (rectangle)^GC- Circle^GD- Diagonal line^GE- Ellipse^GF- Graphic Field (custom graphics)
Images:
- Download:
~DG(Download Graphic) - Recall:
^XG(Recall Graphic) - Format: Hexadecimal bitmap data or ZB64 encoded
See: volume-1/08-commands-graphics.md and volume-1/10-commands-images.md
Stored Formats & Serialization
Stored Formats: Save label templates on printer for variable data
^DFR:FORMAT.ZPL^FS // Define stored format
^XA
^FO50,50^A0N,30,30^FN1^FS // ^FN1 = variable field 1
^XZ
^XF // End of format definition
// Call format with variable data
^XA
^XFR:FORMAT.ZPL^FS
^FN1^FDVariable Text^FS
^XZ
Serialization: Auto-increment fields for sequential labels
^SN123,1,Y // Start at 123, increment by 1, with leading zeros
See: volume-2/03a-advanced-stored-formats.md for complete details
RFID Integration
RFID Commands: Write and encode RFID tags during printing
^RS8 // RFID Setup
^RFW,H^FD4E6F74654461746163^FS // Write hex data to RFID tag
See: volume-1/15-commands-rfid.md for RFID programming
Learning Path
For Beginners:
- Start with
volume-2/01-zpl-basics.md- Learn ZPL fundamentals - Try
volume-1/02-basic-exercises.md- 5 hands-on exercises - Practice with
volume-2/02-programming-exercises.md- 6 progressive exercises - Reference command files as needed
For Intermediate Users:
- Explore
volume-2/03a-advanced-stored-formats.md- Variable data and serialization - Learn
volume-2/03b-advanced-control-commands.md- Advanced control techniques - Study
volume-2/04-fonts-barcodes.md- Font matrices and barcode implementation
For Advanced Users:
- Master
volume-2/03c-advanced-graphics-networking.md- Graphics and networking - Implement
volume-2/06-xml-super-host-status.md- XML status reporting - Optimize with
volume-2/05-printer-configuration.md- Printer tuning
Command Reference Quick Lookup
Most Common Commands
| Command | Purpose | File Reference | |---------|---------|----------------| | ^XA | Start label format | volume-2/01-zpl-basics.md | | ^XZ | End label format | volume-2/01-zpl-basics.md | | ^FO | Field Origin (position) | volume-1/07a-commands-fields-basic.md | | ^FD | Field Data (content) | volume-1/07a-commands-fields-basic.md | | ^FS | Field Separator | volume-1/07a-commands-fields-basic.md | | ^A0 | Scalable font | volume-1/03-commands-fonts.md | | ^BY | Barcode field default | volume-1/04a-commands-barcodes-basic.md | | ^BC | Code 128 barcode | volume-1/04c-commands-barcodes-advanced.md | | ^BQ | QR Code | volume-1/04d-commands-barcodes-2d.md | | ^GB | Graphic Box | volume-1/08-commands-graphics.md | | ^GC | Graphic Circle | volume-1/08-commands-graphics.md | | ^LL | Label Length | volume-1/12-commands-labels-media.md | | ^PQ | Print Quantity | volume-1/14-commands-print.md | | ^PR | Print Speed | volume-1/14-commands-print.md | | ^CF | Change Default Font | volume-1/03-commands-fonts.md | | ^FB | Field Block (text wrap) | volume-1/07b-commands-fields-advanced.md |
Essential Barcode Commands
| Barcode Type | Command | File Reference | |--------------|---------|----------------| | Code 39 | ^B3 | volume-1/04a-commands-barcodes-basic.md | | Code 128 | ^BC | volume-1/04c-commands-barcodes-advanced.md | | UPC-A | ^BU | volume-1/04b-commands-barcodes-upc-ean.md | | UPC-E | ^B9 | volume-1/04b-commands-barcodes-upc-ean.md | | EAN-13 | ^BE | volume-1/04b-commands-barcodes-upc-ean.md | | QR Code | ^BQ | volume-1/04d-commands-barcodes-2d.md | | Data Matrix | ^BX | volume-1/04d-commands-barcodes-2d.md | | PDF417 | ^B7 | volume-1/04d-commands-barcodes-2d.md | | Aztec | ^BO | volume-1/04d-commands-barcodes-2d.md |
How to Use This Skill
Example Usage Patterns
User asks: "How do I create a QR code in ZPL?"
You respond:
Use the ^BQ command for QR codes. Here's the syntax:
^BQa,b,c
- a: Orientation (N=normal, R=90°, I=180°, B=270°)
- b: Model (1 or 2, use 2 for enhanced)
- c: Magnification factor (1-10)
Example:
^XA
^FO100,100
^BQN,2,4
^FDQA,Your QR code data here^FS
^XZ
The ^FD data format is: ^FD<error_correction>,<data>^FS
Error correction levels: QA (high), QM (medium), QL (low), QH (highest)
For complete details and more examples, see docs/volume-1/04d-commands-barcodes-2d.md
User asks: "Show me how to create a cannabis label with strain name and THC percentage"
You respond:
Here's a ZPL template for a cannabis compliance label:
^XA
^FO50,50^GB400,350,3^FS // Border box
^FO100,80^A0N,35,35^FDCannabis Product^FS // Header
^FO100,130^A0N,28,28^FD{{ strain_name }}^FS // Strain (variable)
^FO100,180^A0N,25,25^FDTHC: {{ thc_percent }}%^FS // THC level
^FO100,220^A0N,25,25^FDCBD: {{ cbd_percent }}%^FS // CBD level
^FO100,270^BY2^BCN,80,Y,N,N^FD{{ package_tag }}^FS // Barcode
^XZ
This uses:
- ^GB for border box (volume-1/08-commands-graphics.md)
- ^A0 for scalable fonts (volume-1/03-commands-fonts.md)
- ^BC for Code 128 barcode (volume-1/04c-commands-barcodes-advanced.md)
- Twig-style variables for template integration with BudTags
The {{ }} variables get replaced with actual data in the BudTags TemplateService.
User asks: "My barcode isn't printing. How do I debug?"
You respond:
Common barcode issues and solutions:
1. Check barcode data format:
- Remove spaces and special characters
- Verify data matches barcode type requirements
- Code 128: Supports alphanumeric
- UPC-A: Must be exactly 11 or 12 digits
2. Verify barcode size:
^BY2 // Bar width multiplier (1-10)
^BCN,100 // Height in dots (minimum ~50 dots)
3. Check positioning:
^FO100,100 // Ensure barcode fits on label
4. Enable interpretation line for debugging:
^BCN,100,Y,N,N // Y = print human-readable text below barcode
5. Common errors:
- Data too long for barcode type
- Invalid characters for barcode type
- Barcode positioned off label edge
For detailed barcode troubleshooting, see:
- volume-1/04a-04e-commands-barcodes-*.md (specific barcode types)
- volume-2/04-fonts-barcodes.md (barcode implementation details)
- volume-2/09-error-detection-protocol.md (error handling)
User asks: "What's the difference between ^FO and ^FT?"
You respond:
^FO (Field Origin) vs ^FT (Field Typeset):
^FO (Field Origin):
- Sets bottom-left corner of field
- Traditional positioning method
- Used with ^FD for data
^FT (Field Typeset):
- Sets baseline of text (typography reference)
- More precise for font alignment
- Also used with ^FD for data
Example:
^FO50,100^A0N,30,30^FDText^FS // Bottom-left at (50,100)
^FT50,100^A0N,30,30^FDText^FS // Baseline at (50,100)
Most applications use ^FO. Use ^FT for precise typography alignment.
See docs/volume-1/07a-commands-fields-basic.md for complete details.
Critical Reminders
Always Consider:
- ✅ Units: ZPL uses dots (203 DPI = 203 dots per inch for most Zebra printers)
- ✅ Coordinate Origin: Top-left corner is (0,0)
- ✅ Format Structure: Every label must start with ^XA and end with ^XZ
- ✅ Field Separators: Every field must end with ^FS
- ✅ Case Sensitivity: Commands are case-insensitive (^xa = ^XA)
- ✅ Label Length: Set with ^LL or printer will use default
- ✅ Testing: Use Labelary.com for quick ZPL preview (http://labelary.com/viewer.html)
Common Pitfalls to Avoid:
- ❌ Forgetting ^XA at start or ^XZ at end
- ❌ Missing ^FS field separator
- ❌ Using commas instead of spaces in some commands
- ❌ Positioning elements outside label boundaries
- ❌ Not setting font before text (use ^CF for default or ^A before each field)
- ❌ Wrong barcode data format for barcode type
- ❌ Not accounting for label orientation (portrait vs landscape)
- ❌ Hardcoding values instead of using variables for templates
Testing & Debugging
Labelary Integration
Labelary.com provides instant ZPL preview:
- URL:
http://labelary.com/viewer.html - API:
POST http://api.labelary.com/v1/printers/{dpi}/labels/{width}x{height}/{index}/ - Supports: PNG, PDF output
- Free for testing and development
BudTags Integration: VisualZplMapper component sends mock data ZPL to Labelary for preview
Status Queries
Get printer status and configuration:
~HS // Host Status (printer info)
~HI // Host Identification
^XA^HH^XZ // Configuration Status
See: volume-1/09-commands-host-status.md for all status commands
Error Detection
Enable error reporting:
~JN // Head Test (fatal)
^JZ // Reprint After Error
See: volume-2/09-error-detection-protocol.md for error handling
Your Mission
Help users successfully work with ZPL by:
- Generating correct ZPL code for label designs
- Explaining command syntax and parameters from the documentation
- Debugging ZPL issues and barcode problems
- Suggesting best practices for performance and compatibility
- Providing examples from the programming guide
- Integrating ZPL with BudTags template system
- Referencing the appropriate documentation files
- Showing real-world patterns from the cannabis label use case
You have complete knowledge of ZPL II Programming Language (volumes 1 & 2, 37 files, ~11,326 lines). Use it wisely!
Quick Command Index by Letter
A-C:
- ^A* - Fonts (volume-1/03)
- ^B* - Barcodes (volume-1/04a-04e)
- ^C* - Configuration (volume-1/05)
D-F:
- ^D*, ~D* - Downloads (volume-1/06)
- ^F* - Fields (volume-1/07a-07b)
G-L:
- ^G* - Graphics (volume-1/08)
- ^H*, ~H* - Host Status (volume-1/09)
- ^I* - Images (volume-1/10)
- ^J*, ~J* - Job Control (volume-1/11)
- ^L* - Labels (volume-1/12)
M-P:
- ^M* - Media (volume-1/12)
- ^N*, ~N* - Network (volume-1/13)
- ^P* - Print (volume-1/14)
R-Z:
- ^R* - RFID (volume-1/15)
- ^S*, ^T*, ^W*, ^X*, ^Z* - System/Misc (volume-1/16)
File Size Information
- Total files: 37 markdown files
- Volume 1: 8,348 lines across 23 files
- Volume 2: 2,978 lines across 14 files
- Average file size: 300-400 lines
- AI-optimized: Each file sized for optimal context window usage
Documentation Source
- Source: ZPL II Programming Guide (Zebra Technologies)
- Part Numbers: 45541L-002 Rev. A (Vol 1), 45542L-002 Rev. A (Vol 2)
- Generated: 2025-11-02 04:52:35
- Format: Markdown with metadata headers
Pro Tip: When users ask about specific ZPL commands, always reference the exact documentation file location so they can read more details if needed. Use real examples from the programming guide exercises when possible.
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