Digital FEMALE DB9 RS232 TO MMJ ADAPTER, DB9 PİN CONNECTOR (FEMALE) - MMJ SOCKET (FEMALE)
Interface: DB9 pin connector (female) - MMJ socket (female). This adapter can be used to connect a DEC printer with serial MMJ cable to a normal PC RS232 port. The wiring is explained in the diagram.
DEC-H8571-J adapter, PC RS232 serial port to MMJ
| DB9 (PC) | MMJ socket | Function | ||
|---|---|---|---|---|
| 4 | 1 | DTR | DTR | |
| 3 | 2 | Tx | Tx+ | |
| 5 | 3 + 4 | Signal ground | Rx– + Tx– | |
| 2 | 5 | Rx | Rx+ | |
| 1 + 6 + 8 | 6 | DSR + CTS + CD | DSR |
What is MMJ?
DEC, Digital Equipment Corporation developed a connector system based on modular jacks with 6 leads called DECconnect. The main difference with standard modular jacks is the key which is not in the middle, but at one side. Because of this they are called MMJ for modified modular jack. The shape of the MMJ plug makes it impossible to connect it to regular telephony or LAN networks erroneously. The DECconnect system was not only used for the mainframes, but MMJ sockets also appeared on the DEC Alpha workstations.
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