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Connector 1: DB9 Male Connector 2: 3.5mm Male Intended only for use with 3-wire RS-232 control cables with common ground (pin 5), transmit data (pin 3), and receive data (pin 2) Ideal for use with computers, projectors, and any control unit/display requiring 3-conductor RS-232 serial control Adapt your 3.5mm stereo jack for RS-232 serial control
