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The IOB08DB9V2/V3/V4 has the following pinouts when applied with the BlueHeat PCI/8.
| DB-9 Pin # | RS-232 | RS-485 |
| 1 | DCD | RxD+ |
| 2 | RXD | TxD+ |
| 3 | TXD | TxD- |
| 4 | DTR | RxD- |
| 5 | Signal Ground | Signal Reference |
| 6 | DSR | CTS- |
| 7 | RTS | RTS- |
| 8 | CTS | RTS+ |
| 9 | RI | CTS+ |
- OS
- Microsoft Windows 2000