Printer Setup

NAOS supports ESC/POS thermal printers for printing receipts, kitchen tickets, and closing reports.

Connection Types

Type	Use	Example
Bluetooth	Portable printers	58mm mini printers
WiFi / Network	Fixed network printers	Epson TM-T20, Star TSP
USB	Direct connection	Desktop printers
Built-in	Printer integrated into the device	Senraise H10

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Setting Up a Printer

Bluetooth Printer

1. Pair the printer with your tablet from Android settings (Bluetooth).
2. In NAOS, go to Settings > Printers.
3. Press “Add Printer”.
4. Select Bluetooth as the connection type.
5. The app will search for paired devices.
6. Select your printer.
7. Press “Test Print” to verify.

WiFi / Network Printer

1. Make sure the printer is on the same network as your tablet.
2. In NAOS, go to Settings > Printers.
3. Press “Add Printer”.
4. Select Network as the connection type.
5. Enter the printer’s IP address (e.g., 192.168.1.100).
6. Enter the port (usually 9100).
7. Press “Test Print”.

Built-in Printer (Senraise)

If your device is a Senraise H10 or another POS with a built-in printer:

• The printer is detected automatically.
• No setup is needed.
• Paper width is 58mm (32 characters per line).
• NAOS automatically adapts the receipt format to the narrower width.

Automatic Detection

Senraise devices are detected regardless of the printer configuration in the API. The built-in printer always takes priority.

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Paper Widths

Width	Characters	Devices
58mm	32 chars	Senraise H10, mini portables
80mm	42 chars	Epson TM-T20, Star TSP, most desktop printers

NAOS detects the width and adapts the format:

• 58mm: Compact layout, no per-item tax column.
• 80mm: Full layout with all columns.

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Print Types

Sales Receipt

Prints automatically when a payment is completed:

• Business details (name, tax ID, address).
• Product details.
• Subtotal, taxes, discounts, total.
• Payment method and change.
• QR code for DGI verification.
• CUFE (if electronic invoice).

Kitchen Ticket

In restaurant mode, when an order is confirmed:

• Prints on the kitchen printer.
• Shows only products with notes.
• Indicates table and server.

Pre-check

Prints the order details without closing it (so the customer can review before paying).

Closing Report

When performing an X or Z Closing:

• Sales summary by payment method.
• Expected cash vs. counted cash.
• Difference (overage/shortage).

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Multiple Printers

You can configure several printers with different roles:

• Main printer: Sales receipts.
• Kitchen printer: Kitchen tickets.
• Bar printer: Drink orders.

Set up each one from Settings > Printers in the app or from the Web Portal under Settings > Printers.

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Troubleshooting

Problem	Solution
Not printing	Verify the printer is powered on and paired/connected
Strange characters	Make sure the printer supports ESC/POS
Text cut off	Check the configured paper width (58mm vs 80mm)
QR not printing	Some budget printers do not support QR — contact support
Slow printing (Bluetooth)	Move the device closer to the printer; avoid obstacles

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Need to set up the digital certificate? See Digital Certificate