Intermec Technologies Scanner SF51 用户手册

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Chapter 4 — Configuration Command Reference 
SF51 Cordless Scanner User’s Guide 
43 
PDF417 
PDF417 is only supported on the SF51 with PDF version.  
Enables or disables decoding of PDF417 symbology. The 
PDF417 symbology is a stacked 2D symbology that allows you 
to scan across rows of code. Each row consists of start/stop 
characters, row identifiers, and symbol characters, which consist 
of four bars and four spaces each and contain the actual data. 
This symbology uses error correction symbol characters 
appended at the end to recover loss of data.  
Macro PDF417, a feature of PDF417, extends the capability of 
PDF417 by allowing up to 99,999 PDF417 symbols to be used 
to store data. The symbols are concatenated as they are scanned 
and can be scanned in any order.  
Plessey 
Enables or disables decoding of Plessey symbology. Plessey code 
is pulse-width modulated like most other bar codes. It includes a 
start character, data characters, an eight-bit cyclic check digit, a 
termination bar, and usually a reverse start character. The code is 
continuous and not self-checking. You need to configure two 
parameters for Plessey code: Start Code and Check Digit.  
Postamble 
Sets the postamble that is appended to any data you scan. 
Common postambles include cursor controls such as a tab  
or a carriage return line feed. You can set Postamble to up to 20 
ASCII characters.  
Preamble 
Sets the preamble that precedes any data you scan. Common 
preambles include a data location number or an operator 
number. You can set Preamble to up to 20 ASCII characters.