datecs_sk1_21 #

Complete Dart SDK for Datecs SK1-21 fiscal thermal printer. Supports fiscal receipts, reports, PLU items, VAT rates, electronic journal, fiscal memory, and display control.

Features #

✅ Fiscal Receipts - Full fiscal receipt workflow with sales, discounts, payments
✅ Non-Fiscal Receipts - Free-form text printing
✅ Daily Reports - X Report (read-only) and Z Report (with reset)
✅ PLU Management - Program, read, delete, and sell PLU items
✅ VAT/Tax Rates - Program and read tax rates for groups A-H
✅ Fiscal Memory - Read records, test integrity, generate reports
✅ Electronic Journal - Search, read, export to XML
✅ Display Control - External customer display support
✅ Cash Drawer - Open drawer, cash in/out operations
✅ Barcodes & QR - Print various barcode types and QR codes
✅ Graphics - Logo and stamp image support
✅ 70+ Methods - Complete coverage of printer commands

Requirements #

Windows with DUDE COM driver installed (provided by Datecs)
Datecs SK1-21 connected via RS232 (USB-Serial adapter) or TCP/IP
PowerShell (used as bridge to COM object)

Installation #

dependencies:
  datecs_sk1_21: ^0.1.0

Or for local development:

dependencies:
  datecs_sk1_21:
    path: ../datecs_sk1_21

Quick Start #

import 'package:datecs_sk1_21/datecs_sk1_21.dart';

void main() async {
  final driver = DatecsDudeDriver();

  // Connect
  await driver.startComServer();
  await driver.openRs232Connection(
    const Rs232Config(comPort: 4, baudRate: 115200),
  );

  // Print fiscal receipt
  await driver.openFiscalReceipt();
  await driver.registerSale(
    const SaleItem(
      name: 'Product',
      price: 10.50,
      quantity: 2,
      taxGroup: TaxGroup.b,
    ),
  );
  await driver.registerPayment(const Payment(type: PaymentType.cash));
  await driver.closeFiscalReceipt();
  await driver.ejectPaper();

  // Cleanup
  await driver.closeConnection();
  driver.dispose();
}

API Reference #

Connection #

Method	Description
`startComServer()`	Initialize DUDE COM server
`openRs232Connection(Rs232Config)`	Connect via serial port
`openTcpConnection(TcpIpConfig)`	Connect via TCP/IP
`closeConnection()`	Close connection
`checkConnection()`	Verify printer is responsive
`dispose()`	Cleanup resources

Fiscal Receipts #

Method	Description
`openFiscalReceipt()`	Start fiscal receipt
`registerSale(SaleItem)`	Add product to receipt
`subtotal()`	Print subtotal line
`registerPayment(Payment)`	Register payment
`closeFiscalReceipt()`	Close and print receipt
`cancelFiscalReceipt()`	Cancel current receipt
`printFiscalText(String)`	Print text in receipt

Non-Fiscal Receipts #

Method	Description
`openNonFiscalReceipt()`	Start non-fiscal receipt
`printNonFiscalText(String)`	Print text line
`closeNonFiscalReceipt()`	Close receipt

Reports #

Method	Description
`generateDailyReport(DailyReportType.xReport)`	X Report (no reset)
`generateDailyReport(DailyReportType.zReport)`	Z Report (with reset)
`printOperatorsReport()`	Operators statistics
`printPluReport(start, end)`	PLU items report
`printFiscalReportByDates(start, end)`	FM report by dates
`printFiscalReportByZNumbers(startZ, endZ)`	FM report by Z numbers
`printDiagnostic()`	Diagnostic information

PLU (Price Look-Up) #

Method	Description
`programPluItem(PluItem)`	Program PLU item
`readPluItem(code)`	Read PLU by code
`deletePluItem(code)`	Delete PLU item
`sellProgrammedItem(code, qty)`	Sell PLU item

VAT/Tax Rates #

Method	Description
`programVatRates(Map<TaxGroup, double>)`	Set tax rates
`readVatRates()`	Get current rates

Date/Time #

Method	Description
`setDateTime(DateTime)`	Set printer date/time
`readDateTime()`	Read current date/time

Fiscal Memory #

Method	Description
`getRemainingZReports()`	Get remaining Z capacity
`getLastFiscalRecordDate()`	Last record date
`testFiscalMemory()`	Test FM integrity
`readFiscalMemory(startZ, endZ)`	Read FM records
`getLastFiscalEntryInfo()`	Last entry details

Electronic Journal #

Method	Description
`getJournalInfo()`	Journal statistics
`searchJournalByDate(DateTime)`	Search by date
`searchJournalByReceipt(number)`	Search by receipt
`exportXmlFiles(XmlExportConfig)`	Export to XML

Information #

Method	Description
`getStatus()`	Printer status bytes
`getReceiptStatus()`	Current receipt status
`getCurrentReceiptInfo()`	Receipt totals
`getDailyTaxationInfo()`	Daily tax totals
`getAdditionalDailyInfo()`	Cash drawer info
`getDepartmentInfo(dept)`	Department stats
`getItemGroupInfo(group)`	Item group stats
`getOperatorInfo(number)`	Operator stats
`getDiagnosticInfo()`	Device diagnostics
`getDeviceFullInfo()`	Complete device info
`readTaxNumber()`	Tax registration number
`readLastError()`	Last error message

Display #

Method	Description
`clearDisplay()`	Clear display
`displayUpperLine(text)`	Show on upper line
`displayLowerLine(text)`	Show on lower line

Hardware Control #

Method	Description
`paperFeed(lines)`	Feed paper
`paperCut()`	Cut paper
`ejectPaper()`	Eject paper
`openCashDrawer()`	Open drawer
`cashInOut(amount)`	Cash in/out
`playSound(freq, duration)`	Play beep

Barcodes & Graphics #

Method	Description
`printBarcode(type, data)`	Print barcode
`printQRCode(data, size)`	Print QR code
`loadLogo(imageData)`	Load logo
`loadStampImage(pos, data)`	Load stamp
`printStamp(position)`	Print stamp

Configuration #

Method	Description
`programHeaderLine(line, text)`	Set header line
`programOperatorPassword(...)`	Change password
`readParameter(number)`	Read parameter
`writeParameter(number, value)`	Write parameter

Models #

SaleItem #

SaleItem(
  name: 'Product Name',        // Required: item name
  price: 10.50,                // Required: unit price
  quantity: 2,                 // Default: 1.0
  taxGroup: TaxGroup.b,        // Default: TaxGroup.b (19%)
  unit: 'pcs',                 // Default: 'pcs'
  discountType: DiscountType.none,
  discountValue: 0.0,
)

Payment #

Payment(
  type: PaymentType.cash,      // Required: payment type
  amount: 0,                   // 0 = exact amount
)

TaxGroup #

Group	Default Rate	Description
`TaxGroup.a`	0%	Tax exempt
`TaxGroup.b`	19%	Standard rate
`TaxGroup.c`	9%	Reduced rate
`TaxGroup.d`	5%	Reduced rate
`TaxGroup.e` - `TaxGroup.h`	Custom	Configurable

PaymentType #

Type	Code	Description
`cash`	0	Cash payment
`card`	1	Card payment
`credit`	2	Credit
`check`	3	Check
`voucher`	4	Voucher
`packaging`	5	Packaging
`service`	6	Service
`damage`	7	Damage
`catering`	8	Catering
`rounding`	9	Rounding

Driver #

DatecsDudeDriver #

Uses PowerShell to communicate with DUDE COM object directly:

final driver = DatecsDudeDriver();
await driver.startComServer();
await driver.openRs232Connection(config);

Known Limitations (SK1-21) #

Paper Presenter: The SK1-21 does NOT support software-controlled paper presentation. The physical "eject" button triggers a hardware presenter motor not exposed via protocol.

ejectPaper() performs feed + cut only (not automatic paper presentation)
BackFeedSteps parameter is only available on FP-800/FP-650 models

Serial Configuration #

Default settings for SK1-21:

Parameter	Value
COM Port	4 (varies)
Baud Rate	115200
Data Bits	8
Parity	None
Stop Bits	1

Documentation #

See the doc/ folder for:

DATECS_COMMANDS.md - Complete command reference
DATECS_OPERATIONS.md - Z Report operations
Fiscal receipt examples

License #

MIT License - see LICENSE file.

Author #

Alex Bordei - Senior Software Engineer at ICEFelix

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