7.4. Modem Mode
In addition to allowing data transfer, the Modem Mode also provides additional functions
specifically related to modem communication. A Modem Mode Port can perform all functions
normally available in Any-to-Any Mode. The Modem Mode is available to all APS RS232
ports.
When the Modem Mode is selected, the port configuration menu (command /P) will display
three additional prompts, which allow the user to re-define the modem reset string,
initialization string, and hang-up string.
When the Modem Mode is selected for a port with Supervisor Level command access, the
Supervisor Password should be defined. This will discourage unauthorized access to higher
command functions.
When a call is received, the unit will prompt the caller to enter a password. The APS allows
three attempts to enter a valid password. If the correct password is not entered in three
attempts, or if the user does not respond to the password prompt within 30 seconds, the modem
will disconnect.
The password can be defined and enabled by invoking the /P command as described in
Section 5.5.
Notes:
• When a Modem Mode Port exits Command Mode, or the DCD line is lost while
the Command Mode is active, the APS will pulse the DTR line to the modem.
The unit will then send the user-defined modem command strings to make certain
the modem is properly disconnected and reinitialized.
• When an external modem is installed at a APS port, other ports can use the
modem for calling out. To call out, invoke the /C command to connect to the port,
and then access the modem as you normally would.
7-6
APS Series - Asynchronous Port Switches, User's Guide
Operation
