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RS232 Word Length: Data Bits, Stop Bits, and Parity
Data Bits sets the word length at 7 or 8 bits of data per character.  If an 
application requires only ASCII Hex characters 0 through 7F decimal (text, 
digits, and punctuation), select 7 data bits.  For applications that require 
use of the full ASCII set, select 8 data bits per character.  
Default = 8.
Stop Bits sets the stop bits at 1 or 2.  
Default = 1.
Parity provides a means of checking character bit patterns for validity.
Default = None.
7 Data, 1 Stop, Parity Even
7 Data, 1 Stop, Parity None
7 Data, 1 Stop, Parity Odd
 7 Data, 2 Stop, Parity Even
7 Data, 2 Stop Parity None
  * 8 Data, 1 Stop, Parity None
8 Data, 1 Stop, Parity Even
7 Data, 2 Stop, Parity Odd
8 Data, 1 Stop, Parity Odd
7 Data, 1 Stop, Parity Space