Lower computer, upper computer and data transmission method

Abstract

The invention relates to the field of computers and discloses a lower computer, an upper computer and a data transmission method which realize flexible data transmission. The data transmission method comprises the following steps: marking and numbering data bits of each byte in data to be transmitted; processing with seven bytes as a unit, wherein the processing method comprising the following steps: S1, extracting the data bit numbered as n in the seven bytes in sequence, and filling the data bit extracted in sequence to data bits from a first data bit to a seventh data bit of a first byte in sequence, S2, obtaining seven data bits from a first data bit to a seventh data bit of a second byte according to the rest of data bits of each byte of seven bytes, S3, filling a first identifier in a 0th data bit of the first byte, and S4, filling a second identifier in a 0th data bit of the second byte; transmitting a data package to the upper computer. The lower computer, the upper computer and the data transmission method are used for data transmission.

Description

technical field [0001] The invention relates to the field of computers, in particular to a lower computer, an upper computer and a data transmission method. Background technique [0002] At present, there are mainly two transmission methods in the process of transmitting data between the lower computer and the upper computer (referred to as "data transmission" in this application). The first transmission method is a transmission method in units of ten bytes, and ten bytes of data are transmitted each time. When the length of the data to be transmitted exceeds ten bytes, the data is divided into several data blocks according to ten bytes as a unit. Ten bytes are then transmitted. Therefore, this data transmission method has requirements for the data length, that is, the data length can be transmitted in time only when the data length meets an integer multiple of ten bytes; "01" is used as a mark at the head, indicating that the data is the beginning of a new data to be tran...

AI Technical Summary

Problems solved by technology

When the length of the data to be transmitted exceeds ten bytes, the data is divided into several data blocks according to the unit of ten bytes. Ten bytes are then transmitted. Therefore, this data transmission method has requirements for the data length, that is, the data length can be transmitted in time only when the data length meets an integer multiple of ten bytes; the second transmission method is when the data to be transmitted "01" is used as a mark at the head, indicating that the data is the beginning of a new data to be transmitted, and "FF" is used as a mark at the end of the data, indicating that the data has been completely transmitted, but because F is a hexadecimal number , when there are two consecutive digits of FF in the data to be transmitted, the system will consider that the data has been transmitted, resulting in a misjudgment by the system. In this data transmission method, hexadecimal numbers cannot be used for transmission.

Therefore, the data transmission methods in the prior art have limitations

Images