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9 pin D-SUB female connector layout
Разъем 9 pin D-SUB female
at the computer
This connector is present on Macintosh 128K, 512K, and 512K enhanced.
Pin Name Dir Description
1 GND --- Ground
2 +5V --> +5 VDC. Dont use this one, it may be converted into output handshake in later equipment.
3 GND --- Ground
4 Tx+ --> Transmit Data, positive going component
5 Tx- --> Transmit Data, negative going component
6 +12V --> +12 VDC
7 DSR/HSK <-- Handshake input. Signal name depends on mode: Used for Flow Control or Clock In.
8 Rx+ <-- Receive Data, positive going component
9 Rx- <-- Receive Data, negative going component

a. When connecting to an RS-232 device, use HSKi with data set ready (DSR) or other handshaking signals, depending on the device to be connected.
 

Note: Direction is Computer relative Equipment.
9 pin D-SUB male connector layout
Разъем 9 pin D-SUB male
at the mouse cable
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Источник(и) этой и дополнительной информации: Apple Tech Info Library, Article ID: TECHINFO-0001424; Ben Harris
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