What are the pinouts of the MMJ jacks?


This describes the 6-pin modified modular jack (MMJ) used for serial ports
on various Digital hardware.

Digital carries four DB-to-MMJ adaptors. They are internally wired as follows

Rdy Out TX+ TX- RX- RX+ Rdy In
Adaptor Gender 1 2 3 4 5 6 Use with:
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H8575-A F 20 2 7 7 3 6&8 VTxxx terminal
H8571-C M 6 3 7 7 2 20 Digital printer
H8571-D M 6 3 7 7 2 20 Modem
H8571-E M 20 2 7 7 3 6&8 Female terminal
or LaserWriter
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RS-232 using DB-25 connectors:
DTE DCE
Terminal Modem
or computer
Pin Number Signal Name
2 TD Transmit Data --
3 RD Receive Data



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