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COURIER HIGH SPEED MODEMS
Setting the Transmission Rate
Setting your terminal or software to 57.6K, 38.4K or 19.2K bps
ensures that the Courier can operate at its highest speed. The
modem detects the rate from the AT command and operates
accordingly.
It
also detects your terminal/software settings for
the data formats shown below in Table 6.1.
Follow the guidelines in the Quick Start in Chapter 3 or the more
detailed instructions in Chapter 4 before selecting either variable
or fixed DTE rates (&Bn). Setting the modem to &Bl and your
software to a high DTE rate will give you the best throughput.
Set the modem for flow control (&Hn), as well.
We recommend leaving the modem at its link operation factory
setting, &NO, unless your application requires that you specify a
fixed link rate. &NO allows the Courier to automatically
negotiate with the remote modem for the highest possible link
rate.
Data Format
The Courier and the remote modem must use the same ten-bit
data format. One Start bit is universal and not programmable.
The following table lists the allowable word lengths, parity and
Stop bits.
Word
Parity
Stop
Length
(1
Bit)
Bits
7
Even, Odd
1
Mark, Space
7
None
2
8
None
1
Table 6.1-Allowable Data Formats
Error Control
For reliable high speed data transfer, always set the Courier for
error control, &M4 (the default) or &MS, for calls above 2400
bps. Most users communicating with V.42- or MNP-compatible
modems will want error control at 2400 and 1200 bps as well.
6-2
Asynchronous Operations
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