Epson ESC/VP21 User Manual page 59

S109 Line Speeds Permitted
This bit mapped S-register selects all permitted line speeds. If
the speed bit is set to a '1', then the modern is permitted to connect at
the specified speed. If the speed bit is set to a '0', then the modem
will never connect at the specified speed.
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6-7 Reserved
Default: V.32
52
Reserved
4800
7200
9600
12000
14400
S109=10
V.32 bis S109=62
Bit 2, 4, and 5 not supported.
S REGISTER REFERENCE - 3