PCL-741
2端口RS-232/電流環(huán)ISA含輸入PCI通訊卡
- RS-232,RS-422,RS-485 或電流回路接口
- 16C550 UART支持16字節(jié)*先出FIFO
- 傳輸速度達(dá)921.6 kbps
- 輸入/輸出地址和IRQ選擇靈活
- IRQ: 3, 4, 5, 6, 7, 9, 10, 11, 12 或 15
- 支持RS-232的4線或2線操作
- 預(yù)留有終端電阻空間
- 實(shí)用程序(ICOM工具)強(qiáng)大,易用
PCL-741是一款帶有2個(gè)隔離RS-232或電流環(huán)串行端口的通訊卡。您可以使用卡上的跳線將其端口分別配置為RS-232或電流環(huán)。該卡使用了2個(gè)帶有16字節(jié)FIFO緩存的16C550UART芯片。UART能夠在將數(shù)據(jù)發(fā)送到總線之前將其緩沖處理為16字節(jié)的數(shù)據(jù)包,這樣能夠明顯減輕CPU的負(fù)載,避免系統(tǒng)忙或無法及時(shí)處理中斷時(shí)的數(shù)據(jù)丟失。FIFO緩存功能使PCL-741特別適合Windows下的高速串行I/O。
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