The PCL-746+ from ProMicro is a four-port serial communication interface card, and by using on-board jumpers, each port can be configured individually to either RS232, RS422, or RS485. The card uses 16C550 UARTs and provides improved interrupt handling for reliable operation at transmission speeds of up to 115,2 Kbps. Both standard and enhanced operation is possible. In standard mode each of the four ports can be set up as either the address or the IRQ channel, while in enhanced mode, all four ports can be set to share the same IRQ.
When an on-board 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 pro-cessing, and frees up interrupts for other devices.
The RS485 mode automatically senses the direction of incoming data and switches its transmission direction accordingly making it act as an RS232 network. Application software written for half duplex RS232 can be used without modification. In addition, the user can simply build an RS485 network with just two wires.
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