What is the definition of the analog input module

The analog input module is a remote site analog signal acquisition to the computer equipment, the use of RS-485 bus as a data communication line, provided to 485 analog functions, can simultaneously eight plc analog input module, and by RS-485 bus transfer to the computer. As a result of RS-485 interface as a communication interface, which is capable of transmitting a plurality of modules combination analog signal more large ones, and can be dispersed on a 485 line configuration, using the address code to distinguish, you can directly access the MODBUS RTU protocol configuration software.