The physical signal CAN2.0B specification defines two complementary logical values: "dominant" and "recessive", and when the "dominant" and "recessive" bits are transmitted, the bus result value is "dominant". The "Daminant" value represents a logical "0" and the "Recessive" represents a logical "1". The physical state (eg voltage) representing the logic level is not defined in the CAN specification. The iCAN network uses level signals in accordance with the ISO11898-2 standard. Typically, when the CAN bus is "recessive" (logic 1), CAN_H and The level of CAN_L is 2.5V (potential difference is 0V); when the CAN bus is "dominant" (logic 0), the levels of CAN_H and CAN_L are 3.5V and 1.5V, respectively (potential difference is 2.5V).
It can be seen that the CAN bus is an excellent serial bus than RS-232 in terms of real-time, adaptability, flexibility and reliability. When the two serial devices are far apart and cannot be directly connected by RS-232, RS-232 can be converted to CAN, and the serial port device network interconnection can be realized through the CAN bus.
However, RS-232 and CAN are very different in level and frame format. The specific performance is as follows: RS-232 standard level uses negative logic, which stipulates that any level between +3V and +15V is logic "0" level, and any level between -3V and -15V is logic "1" Level. The CAN signal is transmitted using differential voltage. The two signal lines are called “CAN_H†and “CAM_Lâ€. The static state is about 2.5V. The state at this time is represented as logic “1â€, which can also be called “recessiveâ€. The CAN_H is higher than CAN_L to indicate a logical "0", which is called "dominance". In the case of dominant, the usual voltage values ​​are: CAN_H = 3.5V, CAN_L = 1.5V. Differential voltage definition: Vdiff = CAN_H - CAN_L The yellow line in the figure is CAN_H waveform, the green line is CAN_L in the left and right sides of the waveform, CAN_H=CAN_L=2.5v, called "recessive" (the difference is "0v" ") In the middle of the waveform, CAN_H=3.5V, CAN_L=1.5V, called "dominant" (the difference is "2v")
Wholesale 128GB 256GB 500GB 512GB 120g 1TB flash drive usb ssd M.2 PCIe NVMe hard drive gen3 x 4 2280 hard disk SSD.
* 256GB = approximately 240GB -244GB
* 512GB = approximately 480GB -488GB
M.2 NVME PCIE SSD Fasr response performance Improvement
READ SPEED MAX UP TO 2400MB/S
WRITE SPEED MAX UP T0 1700MB/S
* 128GB = approximately 120GB -122GB
Internal Hard Drives,Solid State Disk,Fast dispatch,ssd M.2 PCIe NVMe hard drive
MICROBITS TECHNOLOGY LIMITED , https://www.hkmicrobits.com