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Gold Medal Software Volume 2 (Gold Medal) (1994).iso
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P132
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1994-02-13
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The TriBBS Bulletin Board System 132
Therefore, it is possible for an error correcting connection to be
sending data much faster than the DCE to DCE baud rate. So that data
will not be lost between the computer and the modem, the DTE to DCE
baud rate must be higher than the DCE to DCE baud rate. Generally,
high-speed modems are locked at either 19200 baud or 38400 baud.
So, how is a serial port locked? The first step is to tell your modem
to maintain the DTE to DCE link at a constant baud rate and to report
DCE to DCE baud rates in the CONNECT string. Additionally, you should
always use RTS/CTS hardware data flow control with an error correcting
modem. To configure your modem to perform these actions, you need to
either add a couple of AT commands to your initialization string or
save the proper AT commands in your modem's NRAM settings.
Unfortunately, there is no set standard for the AT commands that
perform these actions. Consequently, you'll have to either consult
the modem's manual or contact the modem's manufacturer to determine
the appropriate AT commands you need to use. After you've correctly
configured your modem, you need to configure the computer's
communications program. Simply tell the communication program that
the serial port is to be locked and that hardware data flow control is
to be used. Believe it or not, that's all there is to locking a
serial port.