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Universal Asynchronous Receiver Transmitter is UniversalAsynchronousReceiver / Transmitter for short. Hardware part is the data from the serial transmission (Serialcommunication) and parallel transmission (Parallelcommunication) intercropping transmission conversion. UART with other commonly used communication protocols (such as EIARS-232) of the link.
UART include RS232, RS449, RS423, RS422 and RS485 interface, such as standards and bus standards, is the corresponding variety of asynchronous serial communication interface standards and standard bus, which provides the electrical characteristics of communication transfer rate, connection characteristics and mechanical properties of the interface and so on. Actually part of the physical communication network layer (bottom) concept, there is no direct relationship with the communication protocol. The communication diagram shown in Figure 2. GDS-3000 Test and decoding for the UART signal as shown in Figure 3 and Figure 4.

diagram
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I2C (Inter-IntegratedCircuit) PHILIPS company bus is developed in the early 1980s. The original purpose is to allow the processor inside the TV set around the CPU chip and chip more easily connected. First widely used audio and video equipment development, is now mainly used in server management, temperature sensing,toods, voltage level conversion, EEPROM, general IO interfaces, A / D and D / A conversion, speech coding (CODEC),on your todtod crysistod crysis, micro- controller use. Including the status of the individual components of communication, the administrator can query the various components to manage or control the configuration of the system components, functional status,Tods sac a main, such as power supplies and system fans, they can always monitor the memory, hard disk, network, system temperature, etc. several parameters to increase the security of the system for easy management. Data transfer rate selectable 7bit addressing 100kbits / s and high-speed 10bit addressing 3.4Mbits / s.
I2C features include:
l half-duplex bus, only two signal wires: serial data line (SDA) and serial frequency line (SCL)
l bus, independent of each link component Jie You have a unique address, addressing complex system functions by software control, while the need to address decoding hardware power into action

l Support multi-master bus (Multi-MasterBus)
The diagram shown in Figure 5

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By using the GDS-3000 I2C serial bus decoding capabilities,tod campeau, real-time analysis of I2C signals, and decoding the test results indicate as shown in Figure 6,7.
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serial peripheral interface (SerialPeripheralInterfaceBus,tods online storetodstods bag, SPI), similar to I2C, is a 4-wire synchronous serial data protocol platform for portable devices, but the utilization rate of less than I2C. Serial peripheral interface is generally 4-wire, and sometimes also for the 3 lines. Therefore, the choice of the oscilloscope, 4-channel models need to complete the SPI test requirements.
The standard full name of the signal as:
SCLK-SerialClock serial frequency (from the console output)
MOSI-MasterOutputSlaveInput main output from the input (output from the control side)
MISO-MasterInputSlaveOutput main input from the output (the output from the terminal to be controlled)
SS-SlaveSelect from the selection (Low Level action, from the console output)
users can SPIMaster to control SPISlave,tod to mpegtod servertod server, wiring diagram shown in Figure 8, GDS-3000 is shown in Figure 9 indicate the test.

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Instek GDS-3000 serial bus decoding functions included the analysis of SPI, the analysis of results shown in Figure 10.