dyndnstest wrote:Question! 1 can I use a cross over cable?
2 or can I plug into tplink switch do I need to go through router?
Either - no need to have a router in the equation unless you want external access for support or upgrades / updates.
dyndnstest wrote:Static ip addresses are inside range 192.168.1.1 to 192.168.1.254
I meant, what is the DHCP scope on the router? If the Static IP addresses are within the scope of the DHCP range then you could find other devices are being given the same IP address as the tills.
dyndnstest wrote:I get a return ping when the M/Cs lockup
But what about when they lockup? Open a command prompt on both machines, run a 'ping -t 192.168.1.xxx' on both machines to the other machine. Once it's lost the connection, do 'CTRL' + 'C' on each command prompt and look at the statistics, see if any packets were dropped.
If, however, answering 'Yes' to retry doesn't fix it, but an IRC Initialise does then there looks to be something else going on.