3Com PC Card manual Using the Modem

36CHAPTER 5: USING THE MODEM

S21 Bit-mapped. Storable. Bit 0: Telephone Jack (&J CMD)

■0 = RJ11

■1 = RJ12

Bit 1. IF DRS Follows DCD:

■0 = DSR as per bit 6.

■1 = DSR follows DCD all the time.

Bit 2. CTS control (&R CMD)

■0 = CTS follows RTS

■1 = CTS always on

Bit 4,3. DTR control (&D CMD)

■0 = Ignore DTR

■1 = Command state

■2 = Hang up

■3 = Reset

Bit 5. DCD control (&C CMD)

■0 = DCD always on

■1 = DCD controlled by modem

Bit 6. DSR control (&S CMD)

■0 = DSR always on

■1 = DSR controlled by modem

Bit 7. Long space disconnect (Y CMD)

■0 = Disabled

■1 = Enabled

S22 Bit-mapped. Storable.

Bit 1,0. Speaker volume control (L CMD)

■0=Low

■1=Low

■2=Medium

■3=High

Bit 3,2. Speaker control (M CMD).

■0=Always off

■1=On until carrier detected

■2=Always on when off hook

■3=Off during dialing and after carrier detected.

Bit 6,5,4. Extended response codes (X CMD)

■0 = Ignore GSTN status and do not report connection speed - (X0)

■1 = Detect busy and ringing tones and report connection speed - (X5)

■2 = As for X5 and also detect dial tone and perform adaptive dialing - (X6)

■3 = As for X6 - (X7)

■4 = As for X0 and also report connection speed - (X1)

■5 = Detect dial tone and report connection speed - (X2)

■6 = Detect busy tone and report connection speed - (X3)

■7 = Detect dial and busy tones and report connection speed - (X4)

Bit 7. Make/break ratio for pulse dialing (&P CMD). 0= S (39%/61%). 1=UK (33%/67%)