Find and assign network printers with Discover

Overview

The POS can scan your local network to find compatible receipt and label printers, then let you assign each one to a role (customer receipt, kitchen, dispatch, or label). This page explains how to run that scan using the Discover button.

What changed: On Android terminals (such as Sunmi), the printer list no longer scans automatically when you open the Printers screen. You now start the scan yourself by tapping Discover. This keeps the app responsive — the previous automatic scan could briefly freeze the terminal on busy networks. Web terminals are unaffected and still list printers automatically.

Before you start

• Your printer must be powered on and connected to the same network as the terminal (Ethernet or Wi‑Fi).
• The terminal and printer must be on the same subnet (for example, both on 192.168.0.x).
• Any saved printer assignments you already have will still appear immediately — you only need to run a scan to find new printers or change an assignment.

Find your printers

1. Go to Settings > Printers.
2. Tap Discover next to the printer role you want to set up (customer, kitchen, dispatch, or label).
3. Wait for the scan to finish. A full network scan typically takes up to a minute — the spinner shows it's working, and you can keep using the screen while it runs.
4. When the scan completes, open the dropdown and choose your printer's IP address from the list.
5. Repeat for each printer role you need to assign.

Note: An IPP badge next to an address means that printer was found on the modern IPP transport (port 631) rather than classic raw printing (port 9100). Both work — the POS picks the right one automatically.

If no printers appear

Try these in order:

1. Check the network. Confirm the printer and terminal are on the same Wi‑Fi/Ethernet network and subnet. Printers on a different subnet or a guest network won't be found.
2. Power-cycle the printer and give it a moment to reconnect to the network, then tap Discover again.
3. Tap Discover once and wait. Tapping repeatedly won't speed it up — the POS ignores extra taps while a scan is already running.
4. Open the required ports. Discovery looks for printers on port 9100 and port 631. If your network blocks both, the printer can't be found — ask your network administrator to allow them.
5. Add the printer by IP manually if you know its address, instead of scanning.

Tip: Once a printer is assigned, its address is saved. You don't need to run Discover again on every visit — only when adding a new printer or changing an assignment.

Related

• Set up your Zebra ZD230D label printer for allergen labels
• Use multiple label printers