Rockwell Automation 2755-G6-D Scanner with RS-232 Option - Manual (Page 45)

Serial Communication Parameters
Chapter 6
6–3
Serial transmission data consists of three or four
different elements depending on the host system
requirements. These elements are:
•
Start Bit
•
Data Bits (7 or 8)
•
Optional Parity Bits
•
Stop Bits (1 or 2)
In this manual, these elements are represented
graphically in the following manner:
Start Bit
Word Bits
7 Bits
or 8 Bits
Stop Bits or
The Parity bit is used for error detection (e.g., data
altered in transmission), but is not required by all
systems. A parity bit, if required will be in one of the
following four formats:
Odd
Even
O
E
Mark
1
Space O
=
=
=
=
Serial Data
Transmission
Parameters