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Connector pinout: Macintosh Serial Macintosh Serial 9 PIN D-SUB FEMALE at the computer. pin name direction description color 1 Gnd Ground 2 +5V Out +5 VDC. Don't use this one, it may be converted into output handshake in later equipment. 3 Gnd Ground 4 TX+ Out Transmit Data, positive going component 5 Tx- Out Transmit Data, negative going component 6 +12V Out +12 VDC 7 DSR/HSK IN Handshake input. Signal name depends on mode: Used for Flow Control or Clock 8 Rx+ IN Receive Data, positive going component 9 Rx- IN Receive Data, negative going component