AT Commands
Page 109
AT&B Character Length
The &B command allows the modem to use character lengths of 8, 9, 10 or 11 bits.
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The modem will only match the speed of your computer when 10-bit or 11-bit
characters are selected.
Range
0-4
Options
AT&B0 8 bit characters
AT&B1 9 bit characters
AT&B2 10 bit characters
AT&B3 11 bit characters
AT&B4 ■ Use 10 or 11-bit format as detected by autobaud