PCL-740
RS-232/422/485/電流環(huán)串行通訊卡
- RS-232, RS-422, RS-485或電流環(huán)接口
- 帶16字節(jié)FIFO的16C550 UART
- 傳輸速率可達115 Kbps
- 靈活的I/O地址及IRQ選擇
- IRQ: 3, 4, 5, 6, 7, 9, 10, 11, 12 或 15
PCL-740是一款能夠為您提供多種接口選項的電流環(huán)串行通訊卡。您可以在通用RS-232、遠程通訊RS-422、多站RS-485或抗噪聲電流環(huán)之間選擇所需的通訊方式。卡上的16C550 UART芯片帶有16字節(jié)的FIFO緩存器,能夠提供高速、可靠的通訊質(zhì)量(尤其是在Windows環(huán)境下)??ㄉ蠋в袃蓧K16C550 UARTs帶有一個16位FIFO緩存芯片。UARTs將數(shù)據(jù)緩沖成16位數(shù)據(jù)包在將其放入總線之前。這樣大幅度地降低了CPU負載并防止在系統(tǒng)繁忙時和不能及時處理中斷而造成的數(shù)據(jù)丟失。
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