主要特点
rs-485模式下的自动数据流控制
four independent rs-232/422/485 serial ports
4个独立的rs-232/422/485串行端口
speeds up to 115.2 kbps
传输速率可达115.2 kbps
interrupts (jumper se-lectable): 3, 4, 5, 6, 7, 9, 10, 11, 12 or 15
中断(跳线选择):3, 4, 5, 7, 9, 10, 11, 12 或 15
onboard interrupt status register for greater throughput
支持更高数据吞吐量的中断状态寄存器
automatic data flow control in rs-485 mode
rs-422 or rs-485 modes jumper se-lectable
space reserved for optional surge protection on all port lines (in rs-422/485 modes)
space reserved for termination resistors
compatible with arcnet? 4-port cards supporting sco unix/xenix
supports windows? 98/2000/xp, linux?
powerful and easy-to-use utility (icom tools)
内容介绍
the pcl-746+ is a four-port serial communication interface card. the main feature of this card is that each port can be configured individually to either rs-232, rs-422, or rs-485 using on-board jumpers. the card uses 16c550 uarts and improved interrupt handling for reliable operation at transmission speeds of up to 115.2 kbps. this pcl-746+ supports two operating modes: standard mode and enhanced mode. in standard mode, each of the four ports can be set up as either the address or the irq channel individually. in enhanced mode, all four ports can be set to share the same irq. when an onboard interrupt occurs, the interrupt status register indicates which port has generated it. the shared interrupt can be set to most common (extended) at interrupts. this simplifies programming, speeds up interrupt processing, and frees up interrupts for other devices.
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