Data transmission system for automated material handling system

A data transmission system for automated material handling system having master devices mounted on a plurality of automatic transfer vehicles, slave devices mounted on a plurality of manufacturing station units having an unique identification (ID), and a main controller interlocked with at least any one of the master devices and the slave device to be operated, wherein

• the master device comprises a data transmission unit for master and a local controller for master;
• the slave device comprises a data transmission unit for slave and a local controller for slave;
• the data transmission unit for master comprises an infrared (IR) transmission and reception circuit, a radio frequency (RF) transmission and reception circuit, and a transmission and reception circuit unit for master and a processor for master for transmitting and receiving the data between the master device and the slave device;
• the data transmission unit for slave comprises an IR transmission and reception circuit, a RF transmission and reception circuit, and a transmission and reception circuit unit for slave and a processor for slave for transmitting and receiving the data between the master device and the slave device;
• the data transmission unit for master and the data transmission unit for slave serve to mutually transmit and receive a state data including a log data of the master and a log data of the slave and the ID of the slave between the master device and the slave device;
• and
• at least any one of the processes for master and slave sets any one of the IR transmission and reception circuit and the RF transmission and reception circuit as a basic transmission and reception circuit per each manufacturing station unit in advance so as to mutually perform the transmission and reception between the master device and the slave device and switches the transmission and reception circuit so as to allow the other transmission and reception circuit to be operated, if the transmission and reception is not performed between the established transmission and reception circuit, thereby performing carrying goods onto or carrying goods out of the manufacturing station units;
• wherein the processor for master or slave includes a clock function in addition to timer function;
• and
• wherein the processors for master or slave records an input and output data according to the mutual communication, a timing during the input and output of the data, and an input and output time and record a state data information including a noise level, a receiving sensitivity, a transmission subject of the master and slave, a number of communication success, an optical signal timing information in the course of a series of operations, and a storage log information received from the opposing transmittance unit.