Both synchronous and asynchronous transmissions are supported by the standard. In RS-232, user data is sent as a time-series of bits. COM port numbers should only be used with COM names.īy default, the combined operation of the class installer for the Ports device setup class and the Serial function driver configure a device as a COM port.įor information about how the Ports class installer and Serial function driver create a COM port device interface for a COM port, see External naming of COM ports. A computer with an RS-232 serial port can communicate with the serial port of an embedded system (such as a router) as an alternative to monitoring over Ethernet. If you use a COM name, you must obtain the COM port number from the COM port database. To ensure compatibility with most applications that access COM ports, you should assign a symbolic link name that uses the standard naming convention COM, where is the COM port number (for example, COM1). You operate the COM port by using the 16550 UART-compatible interface that is defined in Ntddser.h. The GUID for this class is GUID_DEVINTERFACE_COMPORT, which is defined in Ntddser.h. You access the COM port through an instance of the COM port device interface class. SerialPort(String, Int32, Parity) Initializes a new instance of the SerialPortclass using the specified port name, baud rate, and parity bit. For most devices, the Ports device setup class and the Serial function driver provide the functionality required to operate serial ports and COM ports. For information on USB attached serial ports, see USB serial driver (Usbser.sys). A COM port is a type of serial port that complies with the following additional requirements: Use this constructor to create a new instance of the SerialPortclass when you want to specify the port name and the baud rate. NOTE: Vijeo Designer has many serial protocols supported as well that can be used independently of SoMachine if the COM1 port is not required for use within. This topic describes programming traditional COM ports.
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