live my life in sorrow

May 18, 2008

SUN 18 MAY

Apparatus knowledge of bar code By zhang sanny

Apparatus knowledge of bar code
Bar code printer:  

Bar code printer whether one special-purpose bar code print apparatus, rotate person who print for temperature sensing type and heat

generally. Temperature sensing type need special-purpose temperature sensing paper, hot to transfer to person who print use carbon bring. This

kind of printer generally uses the paper of label, the label on this plane measures the big or small and initial position where the device can

measure the label automatically, can print at a high speed for the unit according to the label. The precision of printing of the bar code printer is

generally 203DPI, the width is generally 104 millimetres, it can reach 4 per second to more than 10 inches to print the pace. Its built-in bar code

produces the function and can print the bar code label with the high speed, the ordinary printer needs special bar code generator to become the

bar code next life. The printer programming control method of the bar code is relatively special, general bar code printer all have one's own

programming control languages, for instance ZPL language of ZEBRA, DATAMAX and DPL language,etc.. They are similar to DOS control

language that the injections of times were typed in the past, utilize the control language of the printer to directly control the behavior of the

printer, and fully utilize the built-in bar code of the bar code printer to produce the function, improve the efficiency of printing. Meanwhile, most

bar code printers offer the standard driver of printing too at present, regard bar code printer as standard WINDOWS printer function, can't

reflect bar code printer superiority of itself in this way '  If can't utilize the bar code of the bar code printer to produce the function)  .  
Bar code reader:  
Mainly there are CCD type and laser type at present in the bar code reader, the depth of field of Model CCD (can read the range of the bar code)

It is 1 to 2 centimetres, there is a new kind of long distance CCD scanner at present, its depth of field can be up to 15 to 30 centimetres, and it is

obviously faster than general type CCDs and laser rifles to read the pace. Laser type (  Commonly called as the laser rifle)  The depth of field can

be up to 70 centimetres, precision is high too, but the price is obviously higher than the former two.  The bar code reader generally adopts the

artificial interface of the keyboard, that is to connect in series on the keyboard using directly, result and people its input into at all the same by

hand, and the general bar code reader can also join a carriage return incantation behind the bar code character input automatically, it is very

convenient to use. In addition a kind of commonly used interface is one bunch of mouths, employ on the cash register and industry apparatus

more, if use on the PC, need to specially work out one bunch of mouths and receive the procedure. Keyboard mouth bar code reader need any

driver, can use at connecting.