ThermoWorks RTR-500NW/AW WIRELESS LAN OR GSM (CELLULAR) LOGGERS - Manual (Page 6)

5. Clock Settings
There’s not a lot to say about this screen that isn’t already self-
evident, with the possible exception of a comment about the
necessity for an SNTP server connection. In addition to
correcting any errors to the RTR-500NW/AW’s internal time
keeping, a connection to an SNTP server also allows for
automatic clock setting after a power failure or surge. While the
logger readings would be unaffected, without this all 500W
originated messages for warnings and the like will show
erroneous times until the unit is manually reset by the user.
Again, be sure that any firewalls in your network allow
connection to the time server.
6. Network Settings
If your router supports DHCP, and almost all of them do, then set
this field to ON and the settings boxes for IP address, etc. will
disappear and can be ignored. If your network setup requires a
fixed IP address, however, set DHCP to off and make the entries
for the IP Address you will use along with the Subnet Mask,
Default Gateway, and DNS Server(s). If you chose this option it
is probably because your IT department told you that you should,
so they can also give you the settings you need to use.
If you have an RTR-500AW you will also need to make the
settings for your wireless LAN. If you are in doubt about what
settings to use here check the documentation that came with your
router, or with your IT department. Remember that the SSID and
password are case sensitive. As a note, the RTR-500AW
supports WPA2 encryption for use in 802.11n networks.