Printer over Ethernet

Ethernet is the most stable option for thermal printers: no dropouts from weak WiFi signal, no unexpected IP changes when the router reboots, and no added latency.

Requirements

• Printer with an Ethernet (RJ45) port — see supported printers.
• Cat5e or Cat6 cable to the client's switch or router.
• One free static IP on the local network.

Step 1 — Connect physically

1. Plug the RJ45 cable into the printer and into the switch/router.
2. Power on the printer.
3. Within 10-20 seconds the network LED should stay solid (or slow-blinking), meaning link is up.

Step 2 — Find the assigned IP

Most printers boot with DHCP and grab an IP from the router automatically. To find out which one:

Print the network config sheet (varies by brand):

The sheet shows the IP address, MAC address and TCP port (usually 9100).

Step 3 — Assign a static IP

Mandatory. If you leave DHCP on, after a router reboot the IP may change and the printer will stop printing.

Option A — DHCP reservation on the router (recommended)

Cleanest approach because all network config lives in the router:

1. Log in to the client's router (usually http://192.168.1.1).
2. Find the LAN → DHCP → Reservations section (name varies).
3. Add the printer's MAC + the IP you want it to always get.
4. Reboot the printer so it picks up the new IP.

Option B — Static IP on the printer itself

If you don't have router access:

1. Browse to the printer's current IP (http://192.168.1.XXX).
2. Network → TCP/IP → Mode: Static.
3. Enter IP, mask and gateway.
4. Make sure the IP is outside the router's DHCP range to avoid collisions.

Step 4 — Enter it in the Print Server

When pairing the Print Server, fill in:

Verify

From the Print Server PC, test connectivity:

ping 192.168.1.100

If it replies, the printer is reachable. Now, in the Print Server, "Test print"; in the panel, the printer should show "Server online".

Common issues

See also: Printer diagnostics.