UniMod 01/I
10
Password authentication after establishment of connection
Using command AT*P the password authentication can be enabled ("AT*P1", see register 14 bit 6)
or disabled ("AT*P0"). As factory default it is disabled.
With authentication enabled the UniMod asks the remote station immediately after the CONNECT
message for the password. This works in originate mode as well as in answer mode. The correct
password (factory default: "modem1"
, alternative “qwerty”) then must be sent by the remote station
to the modem:
REMOTE PASSWORD: m*o*d*e*m*1* (every entered character will be answered with '*')
When the password was entered correctly and diagnostic messages are enabled (using command
"ATQ0"), then again "CONNECT" is sent and the connection is established. With messages dis-
abled, no "CONNECT" is sent. If the password was wrong the modem performs a reset, which
causes it to hang up.
It is urgently recommended to use the password feature with error corrected connections (see
"AT\N3") only, otherwise the correct transmission of the password is not guaranteed (Faulty char-
acters are taken as part of the password.).
Using the "AT*C" command the password can be changed and saved in the modem. After "AT*C"
the modem asks first for the old password: OLD PASSWORD (factory default is "modem1"). Wrong
input causes an ERROR message. If the entered password was correct, the modem asks for the
new password . It's length must be 6 to 12 characters . Finally the modem requests for confirma-
tion: CONFIRM.
Example: Changing the password from "modem1" to "12345678":
AT*C
OLD PASSWORD: modem1
NEW PASSWORD: 12345678
CONFIRM:
12345678
OK (the new password has been taken)
Data Transmit Control (DTC)
Data Transmit Control is a firmware integrated feature for supervising the online data transfer. The
feature prevents the modem from staying online infinitely, even if no data are transferred at all.
In register S11 an arbitrary time span from 1 to 255 seconds can be programmed. DTC is disabled,
if S11 is set to 0 (default value). The contents of this register can be inquired using command
"ATS11?". If the value is not 0, the time counter starts running immediately after the connection is
established. As soon as it is run out the modem is reset, which causes it to hang up.
The time counter is reset by every transmitted or received character. That means, the modem
holds the line for <n> seconds after the last transmitted or received byte, where <n> is the setting
of register S11.
Note: While establishing the connection the modem can neither send nor receive data. The DTC
time counter however starts immediately after the modem hooks off. This can in the worst
case cause the modem to hang up even before the connection is ready. For that reason we
urgently recommend to set the S11 register to a value of 30 at least. The time counter is
started intentionally after hook off, because then it is possible to reset the modem in case of
misbehaviour because a faulty connection.
Summary of Contents for UniMod 01/I
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