TOP Serial Programming Win32 SerialPort Connectors
Pin Assign
RS232C 9Pin DSub Male(PC)
RS232C 25pin Male(PC)
RS232C NI 10 position Modular Jack(RJ50)
Pin Assign 
RS232C 9Pin DSub Male(PC)
| Pin No. | Signal Name | alt. | I/O |
| 1 | DCD | CD | IN |
| 2 | RxD | RD | IN |
| 3 | TxD | SD | OUT |
| 4 | DTR | ER | OUT |
| 5 | GND | SG | - |
| 6 | DSR | DR | IN |
| 7 | RTS | RS | OUT |
| 8 | CTS | CS | IN |
| 9 | RI | CI | IN |
RS232C 25pin Male(PC)
| Pin No. | Signal Name | I/O | Description |
| 1 | N.C (FG) | - | Frame Ground |
| 2 | TxD | OUT | Transmission Data |
| 3 | RxD | IN | Received Data |
| 4 | RTS | OUT | Request To Send |
| 5 | CTS | IN | Clear To Send |
| 6 | DSR | IN | Data Set Ready |
| 7 | GND | - | Ground |
| 8 | DCD | IN | Carrier Detect |
| 9〜11 | N.C | - | No Connection |
| 12 | N.C (BDC) | (IN) | （Secondary DCD） |
| 13 | N.C (BCS) | (IN) | （Secondary CTS） |
| 14 | N.C (BSD) | (OUT) | （Secondary TxD） |
| 15 | N.C (ST2) | (IN) | （Tx Element Timing） |
| 16 | N.C (BRD) | (IN) | （Secondary RxD） |
| 17 | N.C (RT) | (IN) | （Rx Element Timing） |
| 18 | N.C | - | No Connection |
| 19 | N.C (BRS) | (OUT) | （Secondary RTS） |
| 20 | DTR | OUT | Data Ready |
| 21 | N.C (SQD) | (IN) | （Tx Quality Detect） |
| 22 | RI | IN | Ring Indicator |
| 23 | N.C (SRS) | (⇔) | （Data Speed Selection） |
| 24 | N.C (ST1) | (OUT) | （Tx Element Timing） |
| 25 | N.C | - | No Connection |
RS232C NI 10 position Modular Jack(RJ50)
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