Randy, happy to help you brother, first things first!
Okay lets break this down in simple steps! this sounds like simple Networking issues, due to not printing and being able to use the credit cards features.
Is your POS in the same Network range? usually a network consists of 192.168.ZZZ.1 ( Z being a numerical example) all the way to 254. if your other pos is for example to say 192.168.0.80 then this pos has to be ALSO in the same range but with a different IP lets sayyy 192.168.0.81 or which ever is not in use. let me send you a link with the instructions on how to change an IP> https://www.howtogeek.com/howto/19249/how-to-assign-a-static-ip-address-in-xp-vista-or-windows-7/
if your connected to the same network, and you still can't do anything and your ip is correct, then this means that you have another equipment with the same IP as the POS this is called an "IP Conflict" simply change the IP of the adapter and your gonna be good to go.
if everything is perfectly fine, then restart the "Printer Spooler" service within the machine to be able to print and contact the printers. attaching the link aswell http://www.dell.com/learn/us/en/05/videos~en/documents~esupport-start-restart-windows-print-spooler-eng-ver1.aspx
i hope i have been able to help you!