USB mini data logger - 8 12 A / D, with RS-232, I2C, SPI, 
 U812BL company exclusive development, the production of multifunction USB data acquisition products. The Boshi U812BL not only to achieve the 8-channel 12-bit A / D conversion, and five general-purpose I / O, but also with USB and RS-232, I2C, SPI, bus conversion. U812BL is Boshi whole new generation of data acquisition products. Patented product, Beware of imitations! Patent No.: 200 630 307 752. 
 U812BL miniature data acquisition adhering the Boshi products has always been characteristic of ultra-small form factor (80 * 23 * 47mm). U812BL extrapolation computer's USB port, no external power supply. Micro-data acquisition in U812BL free matching Visual BASIC6.0 (to display waveform, save, take the tray, print the virtual instrument software), Visual C + + to write the data acquisition driver software (all with source code), 1.5 m long USB port to extend the cable. In order to reduce the interference signals, it is recommended that all signal leads to the best use of shielded cable and shield grounding. 
 1, the performance 
 Resolution: 12 Number of channels: 8 single-ended to the A / D,, 5 the I / O 
 Sampling rate: ≤ 100KHz measuring range: 0 ~ 5V, ± 5V, 0 ~ 10V, ± 10V 
 With a USB switch to RS-232, I2C, SPI, the extrapolation USB port, no power supply 
 2, the hardware installation: 
 Product to the USB port via a USB cable (A mouth-plugged into the PC USB port on port B). Note that the best grounding for safety, the PC machine shell. Using the USB-HUB to the PC's USB port to play a protective role. 
 The other end of the DB-15 pin seat (with terminals or pins, board logo), the pin assignments are as follows: 
 12,345,678 
 CH0 is CH1 CH2 GND the TXD the SDI SCLK, the SDO 

 9101112131415 
 Of CH3 of CH4 of CH5 CH6. CH7 (RXD) SDA the SLK 

 SDI, SCLK, SDO, the three signal lines of the SPI bus, the SDA, the SLK for the I2C bus 2 signal line TXD (T), RXD (R) RS-232 port to send (out) from U812BL and receiving . SDI, SCLK, SDO, and the SDA, the SLK five signal lines one can separate I / O read and write operations, which is the equivalent of five general-purpose I / O When five feet for SPI, I2C bus communication with SPI, I2C communications operating instructions; 5 foot is used for general I / O with a general-purpose I / O operation instructions. Shared DB on the receiving end of the CH7 analog signal input and RS-232 RXD-15 13 feet. U812BL the RS-232 port, I2C interface, SPI interface to read and write operations, each with a specialized instructions, call on a dedicated Windows DLL, see the CD-ROM that came with the product. Special note is the U812BL the RS-232 port does not like Boshi USB232, USB485 series of products as USB converter for the virtual serial port, U812BL the RS-232 port must pass special instructions to operate, so the advantage of more direct access to Windows the underlying operating, higher efficiency, less delay, the drawback is the software's portability is poor. 
 U812BL four kinds to choose from the measured voltage range: 0 ~ 5V, ± 5V, 0 ~ 10V, ± 10V, selected by the software. 
 Used to measure the current, such as 0-10mA ,4-20mA, the series resistance in the current line (such as 250 ohms, 100 ohms, etc.) to be converted into easy-to-voltage measurements. 
 3, the drive to install and uninstall 
 U812BL is equipped with a 1.5 m long USB extension cable and driver software (a CD-ROM). Follow these steps to install a U812BL the driver software: 
 Start your computer, make sure the computer's USB port is working properly. 
 The U812BL USB cable plugged into the computer's USB port, the computer will automatically detect U812BL and display the "Find New Hardware" and click "Next" to continue. 
 U812BL supporting the CD into your computer's CD-ROM drive, press the "Search for the best driver for your device", select "Specify a location" and choose the path for the "E: \ U812BL \ Driver" (assuming CD-ROM E: drive). 
 Windows will find the driver and display the USB DATA CONVERTER. Click "Next" to continue. 
 Windows also show the need WINDOWS XP certification directly click "Next" to continue. 
 Windows installed driver software, click "Finish" to end. 
 The user can view the "Control Panel" "System \ Device Manager \ Universal Serial Bus Controller", you will find the middle of an increase a "USB DATA CONVERTER" (see figure 4), which is assigned to U812BL. 
 If you want to to uninstall U812BL driver software, the following figure, the "USB DATA CONVERTER" on the right mouse button and select "Uninstall (U)". 
 4, Application Software Introduction 
 U812BL supporting software (a CD-ROM) is not only a driver, also includes the Visual Basic 6.0 and Visual C + + applications written (source code). Visual Basic 6.0 program can display the waveform, save, take the disk, printing (see Figure 2). Instance of the source code for each language program includes the following features: A / D conversion, general purpose I / O read and write, read and write the I2C, SPI read and write, RS-232 transceiver and so on.