Technical Document

These 6 bytes are then transmitted in the same transaction to the ETH8020 and if the password is
correct then 1 will transmitted back, a failure will send 2.
The board will now accept changes from the device that entered the password. If communication
becomes idle for more than 30 seconds then the password protection is re-enabled. There is also a log-
out command of 0x7B to enable the protection immediately.
Get Unlock Time
Returns TCP/IP password protection status:
0 - password protection is enabled and password entry is required before changes can be made
1 to 30 - seconds until TCP/IP password protection is re-enabled. All authorised commands set the
timer back to 30 seconds (including this one).
255 - TCP/IP password is not enabled.
IP Addresses & DHCP Servers
The easiest way to use the ETH8020 is to connect it to a network with a DHCP server. In this case the
ETH8020 will have its IP address assigned automatically by the DHCP server.
If there is no DHCP server on the network, then a fixed IP address of 192.168.0.200 is used.To control
the ETH8020 using this fixed IP address your computer MUST be on the same subnet.
The next step is to set your computers IP address to 192.168.0.x where x is in the range of 1 to 255 but
not 200 (the ETH8020 is there!) or any other used IP addresses on the network.
The subnet mask dictates what IP addresses the PC can communicate with, we set this to 255.255.255.0
so the PC can talk to any module with an IP address of 192.168.0.x
The default gateway is likely to be the IP address that the internet connection is located at and the DNS
server can be either your router address or google provide a DNS service at 8.8.8.8..