Allied Data Technologies TRON SECURE 33.6, Руководство пользователя

Страница: 13 / 63

2.4. Establishment of a data connection
In this paragraph, we will go over the actions, which are necessary to establish a data
connection. Here the communication software is discussed roughly. The fact is, each package
has its own command structure.
1.
Start the communication program.
2. Assure that the software controls the serial port to which the modem is connected.
3. Select the communication speed (baudrate), number of data bits and the parity.
For example: 57600 bps, 8 bits, no parity.
4. Assure that the program is in the terminal mode, so that typed in characters can be sent
to the modem. The modem echoes the characters back to the screen.
5. Type subsequently : AT <Enter>
On the screen appears : AT OK
N.B. If the characters appear on the screen twice, the echo has to be switched off in the
communication program.
With the TRON SECURE 33.6 model, the speed LEDs indicate the baudrate. If none of the LEDs is
on, the DTR signal is not active. This can be changed with the communication program. If this is
not possible, the modem can simulate that DTR is active. This is done with the AT&D0 command.
N.B. Use this method only if you know for sure that the software does not activate DTR.
Almost each program does so, so that at first the cause must be found somewhere else,
for example at the cable.
6. Dial a telephone number with the ATD command
Type for example: ATD0031181698399 (Tron BBS)
The On-line LED is turned on and the modem dials the number.
Through the built-in loudspeaker, you can hear the connection building up.
a. If a connection has been established, one or two of the following messages appear on
the screen:
CONNECT : 300 bps V21 connection
CONNECT 1200 : 1200 bps V22 connection
CONNECT 2400 : 2400 bps V22bis connection
CONNECT 75TX/1200RX : 1200/75 bps V23 connection
CONNECT 9600 : 9600 bps V32 connection
CONNECT 14400 : 14400 bps V32bis connection
CONNECT 33600 : 33600 bps V34 connection
COMPRESSION: CLASS5 : MNP5 connection
COMPRESSION: V42bis : V42bis connection
COMPRESSION: NONE : Connection without compression
FAX : FAX connection
DATA : Data connection
TRON SECURE 33.6
Allied Data Technologies BV - Allways one step ahead 13