4-4 Configuring the Modem
Configuring
the Modem
Direct Operating Mode
If you select Mode=Direct (EC/DC OPT’S category):
•Speed conversion and flow control are no t 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.
If the communications package does not directly support the 326X Series
Modem and you want to use the package’s file transfer method:
•If the communications package supports RTS/CTS flow control, enable it:
a) Set the modem to Flow=RTS/CTS
b) Set Modem Flow=Off
c) Transfer data, using the instructions in the communications package.
•If the communications package does not support RTS/CTS flow control:
a) Set the modem to Flow=Off
b) Set Modem Flow=Off
c) Transfer data, using the instructions in the communications package.
•If the communications packa ge supports the automatic speed dete ct
feature, set Max Rate to a value also supported by the software package.
Set Speed Conver=Off. Set the modem’s adaptive rate parameter to Off.