Black Box MD1641A Manuale Utente

You can store the initialization string in nonvolatile memory. With your
communications software open and connected to the modem’s COM
port, type the initialization string in the terminal window, substituting a
carriage return for 

. To store the string, enter

Now you can initialize your modem with the following simple string:

You must configure your communications software to match your com-
puter’s configuration. If the Series II Modem is connected to the COM2
serial port, you must tell the software you are using COM2. Another
important parameter is the serial port baud rate. This is the speed at
which your modem communicates with your computer, not the speed at
which your modem communicates with another modem. When V.42bis
data compression is enabled, you must have a serial port baud rate four
times the transmission speed of the modem to fully optimize
compression. So if your UART is fast enough, you should set the serial
port baud rate to a minimum of four times the top speed of your
modem.

If you have an 8250 UART, your most reliable serial port speed will be
9600 bps; if you have an 8250A or a 16450 UART, try 19,200 bps; if you
have a 16550 UART or equivalent, a serial port setting of 115,200 bps
can be set reliably.

You must meet the requirements of the remote system for successful
communications. Though the Series II Modem can automatically match
the speed of the other modem, you must specify parameters such as
type of flow control, break length, number of data bits, number of stop
bits, and parity. If you set these parameters incorrectly with the remote
system, gibberish will appear on your screen.