V.22 Fast Connect Command Example - US Robotics 56K USB Modem User Manual

At the end of the message, the application may issue the WAVE_IN_STOP message to the wave driver.
Command/Response
ATH
OK

V.22 Fast Connect Command Example

When the POS server supports V.22 Fast-Connect in V.80 HDLC frame, the modem needs to be issued
the following AT command:
Command/Response
AT+MS = V22
OK
AT+ES = 6,,8
OK
AT+ESA = 0,,,,1,0,,
OK
AT\F1
OK
ATDT<Host Tel Number>
CONNECT 1200NoEC
<0x19> <0xBE> <0x20> <0x20>
<0x19> <0xB1> ...
The first <EM><rate> indicator shows that the modem connected with a TX rate of 1200 bits/s and an RX
rate of 1200 bits/s. The <EM><flag> that occurs immediately after the <EM><rate> indicates that a non-
flag-to-flag transition has occurred and that the receiver has now been synchronized.
DTE issues standard command to terminate call. DCE goes on-hook, speaker
and microphone are detached from system, and modem returns to data mode
(+FCLASS=0).
DCE responds.
Sets modem modulation to V.22.
—
V.42 sync buffer mode (V.80 enabled).
—
Causes the DCE to generate a 16-bit CRC in the transmit direction in
framed submode and check the CRC in the receive direction.
—
Enables V.22 fast connect.
—
Dials host telephone number.
—
Description
Description
Command Reference - 116
56K USB Modem
User Guide