Because of Intel's specification issue, when only use one memory module is used, please install the module in the upper DIMM slot. Please see the below picture:
 
Because of specification limitation, this model now has only support for Windows 7 32-bit.
| RS-232 | RS-422 | RS-485 | ||
|---|---|---|---|---|
|   | PIN | COM | COM | COM | 
| 1 | DCD1# | 422 TX - | 485 - | |
| 2 | SIN1 | 422 TX + | 485 + | |
| 3 | SOUT1 | 422 RX - | ||
| 4 | DTR1 | 422 RX + | ||
| 5 | GND | |||
| 6 | DSR1# | |||
| 7 | RTS1 | |||
| 8 | CTS1# | |||
| 9 | RI1# |