Network Printing (Text)

EPSON LQ-590IIN Ethernet

By default the printer is likely set to DHCP so it will have an IP address that was assigned by the router/DHCP server on the network.

​NMAP is a tool that can be helpful to find the IP addresses of devices on a network.

Using NMAP on PC command prompt or PowerShell window:

In this example the range of IP addresses is limited to 10.1.0.0 through 10.1.5.255 to reduce the time it takes to scan the network. It is known that this network DHCP server is configured to assign IP addresses within this range.

nmap -T4 -F -oN C:\temp\scan_q.txt 10.1.0-5.*

This outputs the scan to a text file on the PC C:\temp\scan_q.txt

Nmap scan report for 10.1.5.123
Host is up (0.00034s latency).
Not shown: 95 closed tcp ports (reset)
PORT     STATE SERVICE
80/tcp   open  http
443/tcp  open  https
515/tcp  open  printer
631/tcp  open  ipp
9100/tcp open  jetdirect
MAC Address: DC:CD:2F:C6:15:E3 (Seiko Epson)

The text file can be opened and searched for the MAC address of the printer. The IP address of the printer will be shown several lines above the MAC address.

…

For a production environment you may set the printer to use a static IP so it is always the same IP address. Alternatively, setup your router/DHCP server to always assign the same IP address to the printer based on the printer's MAC address. Router configuration tools/web interfaces may refer to this as "Static DHCP", "DHCP reservation", or "IP-MAC binding".

Make sure "Allow RAW(Port9100) Printing" is checked.

An 825 Gen2 app may make a network client connection on Port 9100 to the printer's IP address and send text data to printer. The printer buffers data received until a (form feed) character is received. The CCommClient class in lib825ev may be used for TCP/IP communications as a client CCommClient