Virtual Serial Port Kit creates pairs of virtual serial ports in your system which are virtually connected to each other. Physical null modem cables are not required. You can connect any number of virtual port pairs. Virtual serial port pairs will look and work exactly like real hardware serial ports connected via null modem cables. Virtual Serial Port Kit is designed for software developer to speed up development process during debugging and data-logging period and cut months or even years from total project time. Virtual Serial Port Kit is useful also for users which work with Windows applications using serial COM ports joined by null modem cable especially if those applications require more than one serial port pair.FEATURES- full hardware serial ports emulation.- virtual serial ports look and work like real hardware ports.- physical null modem cables are not required.- virtual communication is more fast (up to 250 Kb/s) and reliable than via real null modem cable.- Serial data transmission speed (bitrate) emulation- virtual serial ports configuration via Windows Device Manager.- compatibility with PnP and WMI technologies.- compatibility with VMware.- hot program install - no system reboot is required.- up to 127 virtual serial port pairs can be created.- one click enable/disable button for all virtual serial ports.- user friendly program interface.
Use this utility to change the STU to serial VCP mode. No parameters are required.You can verify that the STU is in serial mode by viewing the serial ports with getSerialPorts.exe.Verify the connection using query.exe:
The device is delivered with a Configuration Manager software. The Configuration Manager can be used to change geometrical settings, brightness, contrast and the electrooptical response by applying a new gamma curve or another digital drive scheme. For these advanced calibrations the device uses an USB connection to a virtual COM port of the computer.
UNIX has always had support for serial communications as the very first UNIX machines relied on serial lines for user input and output.Things have changed a lot from the days when the average terminal consisted of a 10-character-per-second serial printer and a keyboard.This chapter covers some of the ways serial communications can be used on FreeBSD.
To connect a serial terminal to a FreeBSD system, a serial port on the computer and the proper cable to connect to the serial device are needed.Users who are already familiar with serial hardware and cabling can safely skip this section.
Serial ports are the devices through which data is transferred between the FreeBSD host computer and the terminal.Several kinds of serial ports exist.Before purchasing or constructing a cable, make sure it will fit the ports on the terminal and on the FreeBSD system.
Most terminals have DB-25 ports.Personal computers may have DB-25 or DB-9 ports.A multiport serial card may have RJ-12 or RJ-45/ ports.See the documentation that accompanied the hardware for specifications on the kind of port or visually verify the type of port.
Call-in ports are named /dev/ttyuN where N is the port number, starting from zero. If a terminal is connected to the first serial port (COM1), use /dev/ttyu0 to refer to the terminal. If the terminal is on the second serial port (COM2), use /dev/ttyu1, and so forth. Generally, the call-in port is used for terminals. Call-in ports require that the serial line assert the \"Data Carrier Detect\" signal to work correctly.
Call-out ports are named /dev/cuauN on FreeBSD versions 8.X and higher and /dev/cuadN on FreeBSD versions 7.X and lower. Call-out ports are usually not used for terminals, but are used for modems. The call-out port can be used if the serial cable or the terminal does not support the \"Data Carrier Detect\" signal.
By default, FreeBSD supports four serial ports which are commonly known as COM1, COM2, COM3, and COM4.FreeBSD also supports dumb multi-port serial interface cards, such as the BocaBoard 1008 and 2016, as well as more intelligent multi-port cards such as those made by Digiboard.However, the default kernel only looks for the standard COM ports.
If the system does not recognize all of the needed serial ports, additional entries can be added to /boot/device.hints.This file already contains hint.uart.0.* entries for COM1 and hint.uart.1.* entries for COM2.When adding a port entry for COM3 use 0x3E8, and for COM4 use 0x2E8.Common IRQ addresses are 5 for COM3 and 9 for COM4.
The ability to establish a login session on a serial port still exists in nearly every UNIX-like operating system today, including FreeBSD.By using a terminal attached to an unused serial port, a user can log in and run any text program that can normally be run on the console or in an xterm window.
X terminals are the most sophisticated kind of terminal available.Instead of connecting to a serial port, they usually connect to a network like Ethernet.Instead of being relegated to text-only applications, they can display any Xorg application.
This section describes how to configure a FreeBSD system to enable a login session on a serial terminal.It assumes that the system recognizes the serial port to which the terminal is connected and that the terminal is connected with the correct cable.
Configuring Terminal Entries configures two terminals in /etc/ttys.The first entry configures a Wyse-50 connected to COM2.The second entry configures an old computer running Procomm terminal software emulating a VT-100 terminal.The computer is connected to the sixth serial port on a multi-port serial card.
If no login prompt appears, make sure the terminal is plugged in and powered up.If it is a personal computer acting as a terminal, make sure it is running terminal emulation software on the correct serial port.
Use ps to make sure that a getty process is running and serving the terminal.For example, the following listing shows that a getty is running on the second serial port, ttyu1, and is using the std.38400 entry in /etc/gettytab:
FreeBSD supports the NS8250, NS16450, NS16550, and NS16550A-based RS-232C (CCITT V.24) communications interfaces.The 8250 and 16450 devices have single-character buffers.The 16550 device provides a 16-character buffer, which allows for better system performance.Bugs in plain 16550 devices prevent the use of the 16-character buffer, so use 16550A devices if possible.As single-character-buffer devices require more work by the operating system than the 16-character-buffer devices, 16550A-based serial interface cards are preferred.If the system has many active serial ports or will have a heavy load, 16550A-based cards are better for low-error-rate communications. 1e1e36bf2d