User’s Manual for USB/RS232 Full-line Isolation Converter Model: U-232G
Overview: U-232G is a full-line isolator converter used for the transformation from USB interfaces to RS232 interfaces. Controlled by the drivers running on the computer, it emulates the computer’s USB interface to be a traditional RS232 serial port (commonly known as COM port), thus realizing utilization of existing programming software, communication software, monitoring software and some other application software. It obtains the operating power source via the USB interface and therefore needs no external power supply. It has LED indicator lights for all RS232 signals to indicate the operating mode of the interface. U-232G is an industrial-grade product originally designed for industrial application. All RS232 interface signals are subject to photoelectric isolation. An industrial-grade chip with ESD protection is employed. The power circuit has an overcurrent protection circuit. The RS232 interface of U-232G is a standard DTE interface (DB9M pin standard, identical with the RS232 serial port sockets of computers). The signals are arranged as follows:
U-232G realizes very perfect emulation of RS232 serial port and is even able to conduct hardware I/O operations directly. With it, it seems that application programmers were visiting a physical RS232 port. U-232G supports a majority of traditional PLC programming cables, which is an essential difference with the similar products on the market. See the Appendix below for the results of tests in which U-232G is connected with various programming cables of traditional RS232 interfaces for communication with PLC.
Properties and technical indicators: ● Supporting U-232G operating systems: Win98/2K/XP/Vista, MAC OS-9/X, Linux 2.40 and greate ● Completely compatible with USB V2.0 and USB CDC V1.1 codes. ● Isolation voltage: 1000VDC (3500VDC at most. To get an isolation voltage of larger than 1000VDC, statement is necessary) ● RS232 interface and USB interface have ±15kV electrostatic discharge shock protection. ● It is powered on via the USB bus and has an electricity consumption of about 100mA and overcurrent protection. ● Baud rate: self-adapting 300bps～1Mbps standard baud rate ● UART data layout supported by it: data bit: 5, 6, 7 and 8; stop bit: 1, 1.5 and 2; check bit: O, E, M, S and N ● It has all RS232 signal indicator lights: TXD, RXD, RTS, CTS, DTR, DSR, DCD and RI ● Each PC can support 127 pieces of U-232G at most. ● Working temperature: -40～+85℃ ● Length of USB cable: 0.6m; color: black Method of use: U-232G programming cable can be used only when USB device drivers are installed. The drivers are all on the CD sold with the product. Please see the instructions on the driver CD for the specific installation method. After completion of installation of the drivers, the USB OK indicator light on the isolation converter will light up and a COM port corresponding to U-232G will appear in Device Manager of Windows. It is necessary at this time to select COM port in the application software. The method of use after that is identical with that of traditional RS232 interface. If the drivers have not been installed or not installed successfully, or U-232 fails, the USB OK indicator light will be out. Appendix: The test data of successful communication between PLC and U-232G which is connected with traditional PLC programming cables (Win2000/XP operating system)