Serial Port Pin Assignments
Serial Port COM1 uses a Male DB9 connector and it includes
Pin |
| Transmission Signals |
| ||
Number |
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| ||||
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| RS485 |
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1 | DCD |
| TxD- |
| - |
|
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|
|
|
2 | RxD |
| TxD+ |
| - |
|
|
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|
|
|
3 | TxD |
| RxD+ |
| Data+ |
|
|
|
|
|
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4 | DTR |
| RxD- |
| Data- |
|
|
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|
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5 | GND |
| GND |
| GND |
|
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6 | DSR |
| - |
| - |
|
|
|
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|
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7 | RTS |
| - |
| - |
|
|
|
|
|
|
8 | CTS |
| - |
| - |
|
|
|
|
|
|
9 | - |
| - |
| - |
|
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|
|
|
|
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Digital I/O
Digital I/O uses DB9 connector and the pin assignments are described as follow:
Pin 1: DIO4
Pin 2: DIO3
Pin 3: DIO2
Pin 4: DIO1
Pin 5: DIO0
Pin 6: GND
Pin 7: DIO7
Pin 8: DIO6
Pin 9: DIO5
DIO0 to DIO5 are TTL compatible Programmable
DIO and DIO 6 to DIO7 are CMOS compatible Programmable DIO. All the DIO channel are pull up +5VDC with a 4.7K Ohm resistor.
DIO | DIO |
As an Output | As an Input |
GND | GND |
- 12 - |
