User's Manual

and the original or answer mode.

Bit Function

0=0 Do not echo command (E0)

1 Echo command (E1) – default

1 Reserved

2 Mapping to ATQn

3=0 Numeric responses (V0)

1 Verbose (Verbal) Responses (V1) – default

4,5= Mapping to AT&P

6=0 Use touch-tone dialing method (T) – default

1 Use pulse dialing method (P)

7=0 Answer incoming calls (A)

1 Originate calls (D) – default

S21 Bit-mapped Register

Bit-mapped register S21 lets you control certain data communication control signals.

Bit Function

0,1= x Undefined

2= Mapping to AT&R

3,4=0 Modem ignores the DTR signal (&D0)

1 Modem enters command mode after ON-to-OFF DTR transition (&D1)

2 Modem hangs up after ON-to-OFF DTR transition (&D2) – default

3 Modem resets after ON-to-OFF DTR transition (&D3)

5=0 CD signal always on (&C0)

1 CD signal on when a remote carrier signal is present (&C1) – default

6 =0 AT&S=0

1 AT&S=1

S22 Bit mapped Register

Bit-mapped register S22 lets you control internal speaker and the modem responses.

Bit Function

0,1= 0 Speaker volume off (L0)

1 Low speaker volume (L1)

2 Medium speaker volume (L2) – default

3 Loud speaker volume (L3)

2,3= 0 Speaker off (M0)

1 Speaker on until carrier detected (M1) – default

2 Speaker always on (M2)