Rockwell Automation 2755-G6-D Scanner with RS-232 Option - Manual (Page 46)

Serial Communication Parameters
Chapter 6
6–4
7 Data Bits, 1 Stop Bit, Parity Check
If your system requires a word length of 7 Data bits, a
single Stop bit, and Parity check, scan the appropriate
label below.
ED
7 Bits
O
EC
7 Bits
E
EB
7 Bits
1
EA *
O
7 Bits