J4 Serial Port Connector
One of the methods for communicating with the PMAC is via serial port. The image above shows the relevant portion of the J4 connector for connecting to a serial port on the PC. Assuming that you want to connect to a 9 pin serial port on a PC, then connect as follows:
| PMAC J4 | PC 9 Pin |
|---|---|
| Pin 3 | Pin 3 |
| Pin 5 | Pin 2 |
| Pin 7 | Pin 7 |
| Pin 9 | Pin 8 |
| Pin 13 | Pin 5 |
On the new UMAC format, the serial port connection is as follows:
| PMAC J7 | PC 9 Pin |
|---|---|
| Pin 3 | Pin 2 |
| Pin 5 | Pin 3 |
| Pin 9 | Pin 5 |
| Pin 4 | Pin 7 |
| Pin 6 | Pin 8 |
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