Proteus 串口资料COMPIM Serial Port Model.docVIP

COMPIM Serial Port Model Introduction Traditionally, simulation systems have had no direct connection to the physical world around them. This meant that if you wanted to simulate part of a much bigger system of interconnected units, one had to either create simulations of the other units, or create files containing test data. The Virtual System Modelling capabilities of Proteus VSM allow the creation of models that can actually interact with the physical world. We call such models Physical Interface Models or PIMs for short. The COMPIM model is a Physical Interface Model of a serial port. Incoming serial data is buffered and presented to the circuit as a digital signal, whilst serial digital data generated by a CPU or UART model appears at the PCs physical COM port. The COMPIM model also provides for baud rate translation, and for optional hardware or software handshaking on both the physical and virtual sides of the device. This allows any real world hardware equipped with a serial port to interact with a VSM simulation. For example, you could use it to develop a program for a microprocessor within Proteus VSM that would operate a real physical modem, perhaps as part of a security or home automation system. Alternatively, a monitor debugger running on one PC can be used to debug a simulated design running within VSM. The COMPIM model can also be used for some simple digital I/O: the CTS, DSR, DCD and RI lines on the physical serial port can act as rudimentary digital inputs from external stimulus, such as switches; the RTS and DTR lines on the physical serial port can act as rudimentary outputs. Bear in mind that these signals may need addition physical signal conditioning, depending on application and port type. Device Layout COMPIM has eight pins: TXD, RXD, CTS, RTS, DSR, DTR, DCD and RI. TXD, RTS and DTR are inputs to the device and become outputs on the physical port. RXD, CTS, DSR, DCD and RI are inputs from the physical port that become outputs on the devi