The HD67507 is a "Slave (server)" from the side Ethernet and is "Master" from the side Rs232/Rs485.So, you can connect a "Master (Client)" Modbus TCP with one or more "slaves" Modbus RTU in order to exchange information between the Modbus TCP master and the Modbus slaves.It is able to manage up tp 10 simultaneous connections from Ethernet side.They are available in two Housing types: Type A and Type B (see "View" below).The HD67507 is available also with the Wi-Fi version: it allows to interface a Modbus TCP Master with some Modbus RTU slaves. The Modbus TCP connection is done over Wi-Fi.The order code is HD67507-WiFi-B2.