PN-DNet
DI&DO to Ethernet Module
PN-DNet uses ASIX family microprocessor for implementing Ethernet functions (DI/DO TO Ethernet). It uses the state machine to handle TCP/IP stack with most but limited functions because of the limited resources.
PN-DNet supports TCP, UDP, IP, DHCP-Client, Modbus/TCP even HTTP protocols. You can use any browsers to set the parameters, or just use the commands in console mode.