The difference between code39 and code93

　　 The bar code can indicate the country of production of the product 、 Manufacturer 、 Book classification number 、 Where the mail starts and ends 、 Category 、 Dates and so on , So it has been widely used in many fields , Especially those that can support letters at the same time 、 Numbers 、 Characters the barcode of these character sets . such as Code39 and Code93, Are barcodes that can support multiple character sets , But it is similar to what we often see on commodities EAN 13 Bar codes are different ,Code39 and Code93 It is commonly used in enterprise user-defined coding applications .

　　Code 93 and code 39 Have the same character set , At the same time 0-9 Numbers ,A-Z Twenty six capital letters , And include space characters (Space) Including eight special characters .

　　 In terms of ease of use ,code39 Display is the easiest , The encoding only needs to add symbols before and after the original string “*” that will do .code39 Relatively difficult to identify , Both white and black lines have only two kinds of combination .

　　code 93 Double checkers are used . That is to say, there are two check codes in the bar code , To reduce the error rate of bar code scanner reading .code 93 The printing length of the code is code 39 Code short （ Occupy 9 position ）, Under the same character set , Than code 39 Be narrow . and code 93 Bar code character table and code 39 Bar code compatibility , In case of insufficient printing area , It can be used properly 93 Code instead of 39 code .Code93 The security ratio of the code code 39 Code height .

　　 In terms of reliability ,code93 The size should be higher than code39 code . in application , Many express companies use code39. I have seen it used in the hospital code39 Of , Its recognition speed is relatively slow . On the whole code39 Code is supported by most .