SIGNAL TRANSMITTING DEVICE AND PLUG

摘要

PROBLEM TO BE SOLVED: To provide a plug and jack type signal transmitting device and a plug capable of coping with either communication by identifying two-way communication or one-way communication. SOLUTION: In a signal transmitting device equipped with an insertion hole 106 possible to be inserted with the plug 105 of a cable 103 for signal transmission, a means of identification 113 to identify the plug 105 to be inserted into the insertion hole 106 and a means of controlling a transmission passage 120 to control the transmission passage based on the identified result of the means of identification 113 are provided.