Most IrDa chips in the SIR mode are UART 16650-compatible (16650 is a common PC UART), so the legacy Linux serial port drivers can serve as link-level drivers.
大多数处于 SIR 模式的 IrDa 芯片是 UART 16650 兼容的（16650 是一种公共 PC UART），因此传统 Linux 串口驱动程序可以充当链路级别的驱动程序。
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As such, the profile allows legacy applications to use Bluetooth as if it were a serial-port link, without requiring any modification.