PCL-740
RS-232/422/485/电流环串行通讯卡
- RS-232, RS-422, RS-485或电流环接口
- 带16字节FIFO的16C550 UART
- 传输速率可达115 Kbps
- 灵活的I/O地址及IRQ选择
- IRQ: 3, 4, 5, 6, 7, 9, 10, 11, 12 或 15
PCL-740是一款能够为您提供多种接口选项的电流环串行通讯卡。您可以在通用RS-232、远程通讯RS-422、多站RS-485或抗噪声电流环之间选择所需的通讯方式。卡上的16C550 UART芯片带有16字节的FIFO缓存器,能够提供高速、可靠的通讯质量(尤其是在Windows环境下)。卡上带有两块16C550 UARTs带有一个16位FIFO缓存芯片。UARTs将数据缓冲成16位数据包在将其放入总线之前。这样大幅度地降低了CPU负载并防止在系统繁忙时和不能及时处理中断而造成的数据丢失。
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