USB-RS232 device

[Langward]

Hi all,

As the PC industry continues to develop, the current computer / computer RS-232 interface, less and less, and some did not (for example in some laptops), USB (Unviversal Serial Bus) interface is gradually replacing the old PC's a variety of low-speed peripheral interfaces. However, there are many important industrial environment equipment still in use RS-232/485/422 interface, interface design, this, in order to achieve the laptop or workstation USB interface, easy access to serial devices, USB to serial converter is undoubtedly a kind of a bad solution. Please suggest.

[RoninBlade]

There are some problems in this way, mainly:
1. RS-232 is a relatively outdated communication protocols, many new computers, such as notebook computers have not had this interface;
2. RS-232 rate is not enough high. (485 enables high-speed 10Mbps communication speed, and general computer's RS-232 port baud rate can only reach 115kbps rate, conversion rate can not meet the requirements);
3. a number of occasions require the use of passive (no external power supply) and RS-232 to RS-485 converter. At this time converter to work need to take power from the 232 port, serial port is likely to face power shortage.

[deoWo]

The USB-RS 232 converter good enough to make up for :
1. USB (Universal Serial Bus) is the new standard of the most popular computer interface. Many new computers are equipped with USB interfaces.
2. Compared to RS-232, USB interface, high communication speed. USB1.1 up to 12Mbps, USB2.0 up to 300Mbps rate, and a variety of rates and means of communication, can fully meet the requirements of fast conversion 485.
3. USB interface itself has strong supply ability. Therefore USBóRS-485 converter requires no external power supply (that is, the problem of insufficient power supply does not exist). In addition, USB bus there are other advantages. For example: hot-plug, convenient connections, so multiple devices can be attached.

[Rawko]

USB232 driver installed, automatically in your computer system in a serial COM port virtual. For example, your computer has two serial ports COM1 and original COM2, then USB485B driver installation automatically after a virtual COM3 port (normally is the case, the specific COM port number assigned automatically by the Virtual Driver). If your computer does not have RS-232 interface (such as the relatively new laptop), then the driver is installed, an automatic virtual COM1 port. The driver from the USB-RS232 virtual COM port and the computer out of the original application software for the COM port is the same. All the best.

[T.J.]

The USB-RS232 device specification is that
# 1-port USB RS232 serial interface, with 2 m long, integrated USB-A cable, D-Sub 9-pin port connector of public
# Compatible with any Windows Vista/XP/2000 PC COM port using an application
# 230.4 kb / s standard baud rate, 128 B transmit and receive FIFO
# RS232 port fully functional, including the RTS / CTS hardware handshake lines
# In NI LabVIEW, NI LabWindows ™ / CVI, NI-VISA API with the ANSI C / C + + programming in easy
# NI-Serial device driver and includes the NI-VISA driver integrated, easy serial programming.