RS-232-C provides 25 signals in the standard for different purposes, but in actual use, most signals are not used. Generally, more than 10 signals are used for communication between computers and peripherals. The primary task of the interface line is to connect two different types of lines together. And call it asynchronous communication. Asynchronous communication is divided into serial and parallel. This type of asynchronous digital data is in bytes. One byte of data is sent from one side at a time, and the other side receives the byte of data. Bytes are transmitted asynchronously, so there is no clock signal indicating the start and end points of the data. Therefore, the start bit and the stop bit are included in the data byte. The start bit is usually placed at the beginning of each data, and the data line containing the byte data remains high. When the data is output, the line goes low. Therefore the start bit is a low level data. After the start bit is byte data, at the end of the byte data, the data line goes high again and remains two bits (Bit). The two bits are stop bits and are high. Thus, a data frame format consists of 11-bit binary numbers, of which 8 bits are data, 1 bit is the start bit, and 2 bits are the stop bits. A data transfer error may occur during data transfer, so a 1-bit parity bit can be added to the data byte. The parity bit is placed before the stop bit. The odd parity is to count the number of 1 in the transmitted data byte. When the number of 1 is odd, the odd parity bit is 0, and the odd parity guarantees the number of 1 in the data byte. It is an odd number. Even parity is the same as odd parity. (Finish) Plastic Injection Clear Housing
The transparency of the plastic injection transparent shell matrix resin itself has a great influence on the transparency of PP plastic products. In order to improve PP transparency, a small amount of polyacrylate resin with good transparency and compatibility can be added.
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(1) the inorganic nucleating agent mainly consists of ultra-fine talc powder and SiO2, and also includes calcium carbonate, mica powder, inorganic pigments and fillers, etc., which is cheap in price and rich in source, but has certain influence on the gloss and transparency of the products.
(2) organic nucleating agent organic nucleating agent is a kind of organics with low relative molecular weight, represented by sorbitol and its derivatives. It has good compatibility with matrix resin and can significantly improve product transparency and surface gloss.
(3) in the case of sorbitol, when the amount of nucleating agent exceeds 0.3%, the effect of transparency improvement is not obvious, and even decreases. However, when the dosage is less than 0.2%, the nucleation quantity is insufficient and the transparency is not increased enough. It can be seen that the amount of nucleating agent should be between 0.2-0.3%. Therefore, suitable nucleating agent content can better improve the transparency of PP.