Modbus, Modbus TCP
AddMe Jr. features 10/100BaseT Ethernet and EIA-485 communications with Modbus RTU and Modbus TCP/IP, embedded web server, SNMP agent, and astronomical clock. AddMe Jr. features 12 universal inputs configurable as analog or discrete inputs. Two of the universal inputs can be configured for pulse counting, either frequency measurement or totalizing count. AddMe Jr. also includes 2 open drain FET outputs.
See attached spec. sheet.