Printer Setup

Printer settings are found in the POS under Settings > Printer. Each device manages its own printer configuration — printers are stored locally and not synced between devices.

Supported Printers by Platform

Platform	Supported Printers	Connection
Web app	Epson and Star printers with built-in web server	Network (HTTP)
Desktop app	Any network receipt printer	Network (TCP)
iOS app	Epson and Star (Bonjour discovery)	Network

Why only Epson and Star on the web?

Web browsers cannot open raw TCP connections. Epson and Star receipt printers include a built-in web server that accepts print jobs over HTTP — this is the only way to send ESC/POS commands from a browser. The desktop app doesn't have this limitation because it can connect directly via TCP.

Adding a Printer

1

Open Printer Settings

Go to Settings > Printer in the POS. If no printers are configured, you'll see an empty state with an Add Printer button.

2

Enter Printer Details

You only need two things:

Printer Name — a label for this printer (auto-generated as "Receipt Printer", "Receipt Printer 2", etc.)

IP Address — the network IP of your printer (e.g., 192.168.1.100)

3

Automatic Vendor Detection

After entering the IP address, WCPOS automatically probes the printer to detect whether it's an Epson or Star device. You'll see a "Detected: Epson" or "Detected: Star" label once detection completes.

This also auto-fills the correct port, command language, and vendor settings.

If detection fails, you can manually configure these in Advanced Settings.

4

Save and Test

Click Save to test the connection automatically. If the test fails, you'll see an error with likely causes. You can also click Save without testing to skip the test.

Advanced Settings

Expand Advanced Settings to manually configure:

Setting	Options	Description
Vendor	Epson, Star, Generic (desktop only)	Printer manufacturer
Port	Auto-detected	Network port for the printer
Language	ESC/POS, StarPRNT, StarLine	Command protocol
Paper Width	58mm, 80mm	Receipt paper size (58mm = 32 characters, 80mm = 48 characters)

Printer Options

Option	Description
Auto-cut	Automatically cut the paper after printing
Open cash drawer	Send a kick command to open the cash drawer after printing
Auto-print	Automatically print a receipt after checkout completes

Network Discovery (Desktop Only)

The desktop app can scan your local network for printers:

1. Click Scan Network in the printer settings
2. WCPOS discovers printers advertising themselves via mDNS (Bonjour)
3. Discovered printers show their name, IP address, and detected vendor
4. Click Add next to a discovered printer to pre-fill the setup form

Finding Your Printer's IP Address

Most receipt printers can print a self-test page that includes the IP address:

• Epson: Hold the feed button while powering on
• Star: Hold the feed button for 5 seconds while powered on

Alternatively, check your router's connected devices list or your printer's configuration utility.

Static IP Recommended

Receipt printers should use a static IP address to prevent the address from changing when the printer restarts. Configure this either:

• In your printer's built-in web interface (usually accessible at http://<printer-ip>)
• In your router's DHCP settings (assign a reserved IP to the printer's MAC address)

Epson Printers

Epson printers with ePOS support communicate over HTTP. WCPOS sends SOAP/XML requests to the printer's built-in web server.

Connection details:

• Port 8008 (HTTP) or 8043 (HTTPS)
• Endpoint: /cgi-bin/epos/service.cgi

Confirmed working models:

• Epson TM-T70-i 2 (network)
• Epson TM-m30iii (with Printus middleware)

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Make sure your Epson printer has ePOS enabled in its configuration. Access the printer's web interface at http://<printer-ip> to check and enable ePOS settings.

Star Printers

Star printers with WebPRNT support communicate over HTTP. WCPOS sends commands to the Star WebPRNT endpoint.

Connection details:

• HTTPS or HTTP
• Endpoint: /StarWebPRNT/SendMessage

Generic Printers (Desktop Only)

The desktop app supports any network receipt printer via raw TCP. Enter the printer's IP address and port (usually 9100). This works with most thermal printers regardless of manufacturer, as long as they accept ESC/POS commands.

Cash Drawers

Cash drawers connected to a receipt printer can be triggered automatically after each sale:

1. Enable Open cash drawer in the printer options
2. The POS sends an ESC/POS kick command after printing

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Cash drawer control requires a thermal printer profile — the browser print dialog cannot trigger cash drawers.

Troubleshooting

Printer not detected during setup

• Confirm the printer is powered on and connected to the same network as your device
• Check the IP address is correct (print a self-test page)
• For web app: confirm the printer is an Epson or Star model with ePOS/WebPRNT support
• For desktop app: try the Generic vendor option with port 9100
• Check that no firewall is blocking the connection

Printer detected but nothing prints

• Check the paper roll — it may be empty or jammed
• Verify the paper width setting matches your paper (58mm or 80mm)
• Try printing a self-test from the printer itself to confirm it works
• Check the command language matches your printer (ESC/POS for Epson, StarPRNT for Star)

Receipt is garbled or has wrong characters

• The command language setting may be wrong — try switching between ESC/POS, StarPRNT, and StarLine
• Ensure the paper width setting is correct

Cash drawer doesn't open

• Confirm Open cash drawer is enabled in printer options
• Check the drawer is connected to the printer's DK port (not a separate power source)
• Not all printers support the drawer kick command — consult your printer's documentation

Cannot connect from the web app

• The web app can only connect to Epson and Star printers with built-in web servers
• Generic/USB printers are not supported on the web — use the desktop app instead
• Check that HTTPS is not blocking mixed content if your site uses HTTPS but the printer uses HTTP