0049-1800-xxx 326X V.34, V.34-SDC and V.32bis Series Modem – USER’S GUIDE 02/23/2010
Rev. A
Page 44
of
205
Auto Dialing and Answering in Option Set 1
When the modem is configured for Option Set 1, and the communications software package
executes an auto dialing and answering operation, the modem automatically adjusts its baud rate
to the communications software baud rate and parity. This rate remains constant during the
established connection.
Direct Operating Mode
If you select
Mode
=Direct (EC/DC OPT’S category):
•
Speed conversion and flow control are not supported. If the communications package
does not support speed detect, change the 326X’s modulation mode to
Auto V.32
, and
after a connection is established, change the communications software rate to match the
modem’s connection rate.
•
If the communications package supports data rates higher than 9.6 kbps, set the modem’s
maximum rate (
Max Rate
, AT
*
MX) to the higher rate and disable the adaptive rate
feature before placing or answering calls. Ensure that the package’s speed and the
modem’s connection rate match when the connection is established.
NOTE
: Some
communications software packages support the automatic speed detect feature, which
automatically matches the modem’s baud rate with the software package’s baud rate.
Transferring a File
Refer to the communications package instructions for the procedure for transferring files using
the communications software package’s supported protocols.
Ring Messages
Some communications packages wait for ring messages to be received before the modem
answers incoming calls. The 326X Series Modem must be set to the communications software
package’s baud rate before the package recognizes the ring message. Set
DTE Rate
, by the
front panel or by issuing an AT command, when the modem is configured for autobaud
operations.
Flow Control Requirements
•
Flow control prevents buffer overflow when line disturbances cause frequent
retransmissions. See “AT
*
FL” (for the DTE) and “AT
*
MF” (for the modem) in
Appendix A.
