TP-Link TL-WR940N User Manual page 26

Wireless Password - You can enter ASCII or Hexadecimal characters.

For ASCII, the key can be made up of any numbers from 0 to 9 and any letters from A to
Z, and the length should be between 8 and 63 characters.
For Hexadecimal, the key can be made up of any numbers from 0 to 9 and letters from
A to F, and the length should be between 8 and 64 characters.
Please also note the key is case sensitive, which means that upper and lower case keys
will affect the outcome. It would also be a good idea to write down the key and all related
wireless security settings.
No Change - If you choose this option, wireless security configuration will not change!

These settings are only for basic wireless parameters. For advanced settings, please refer to
4.6 Wireless".
5. Click the Finish button to complete the Quick Setup.
TL-WR940N/TL-WR941ND
Figure 3-13 Quick Setup - Finish
16
450Mbps Wireless N Router