Service manual

Avantra 36/44 Service Manual

3-12 Diagnostics

2. Modem Dial-out

After the initialization string has been responded to, the modem dials out

the pre-stored telephone number in the modem’s conﬁguration proﬁle.

The modem stores up to four telephone numbers in non-volatile memory,

0 - 3. The telephone number must be stored in location 1. The ﬁrmware

issues the dial command ATDS=1 to the modem.

Once the command is sent, the ﬁrmware waits for a response string. If

there is no response string after four minutes, the ﬁrmware times out, then

hangs up the connection and tries again. If a response is received, it is

compared ﬁrst against a CONNECT message. If a match occurs, the ﬁrm-

ware proceeds to the login procedure. If the response is BUSY or NO

CARRIER, the ﬁrmware hangs up, waits four minutes, and tries dialing out

again. This continues until a CONNECT message is received.

3. Login Procedure

Once a connection has been established, the ﬁrmware transmits the log-in

prompt ARWIN to the remote site. The Avantra waits until it receives the

proper log-in name ARROW. When the log-in name has been received,

full access to the system is allowed.

4. Modem Hang Up

The ﬁrmware sends a hang-up string to the modem to hang up the tele-

phone line. The hang-up string is:

+++ATZ