Across the Boards
Communications Device Drivers
Section 5 - General Configuration and Usage Information
Page 201
cfSOFTWARE Confidential,
2000
5.14 cfPPP Driver Usage (continued)
When the SysReq key is sent, The TTY screen is cleared, the keyboard is locked, and the status of the PPP link
is displayed on the first line. At link startup this will be “PPP: Negotiating” while the PPP negotiation happens,
and when the link is fully established “PPP: Connected” is displayed. No other TCP/IP activity should occur
until the connected state is reached.
Link Shutdown
When the PPP connection is to be shut down, a script should be run to end the PPP session, hang up the phone
and reset the modem as appropriate. PPP link shutdown is triggered with the Test Key. When the test key is
sent, the status will change to “PPP: Shutting Down”. When the PPP connection is down, the status changes to
“PPP: Down” and the keyboard is unlocked. If the test key is pressed while in the “PPP: Shutting Down” state,
a hard reset on the PPP connection will be performed.
After the PPP connection is ended, normal modem command sequences should be used to hang up the line and
reset the modem as appropriate.
cfPPP Command Mode
Various PPP driver settings can be made by issuing commands to the driver (either manually or via a script). This is
done by entering “Command Mode” and entering the desired command. A command entered in command mode is not
sent to the host. Command mode is entered by sending the Attn key. A “::” (two colons) prompt will be displayed. The
command should be entered, followed by an enter or carriage return. Any other keystroke will cancel command mode.
The driver will display a response (“<OK>“ or an error/status message).
USERID=username Sets PPP user name
PASSWORD=password Sets PPP password
TRACKDCD=on/off Sets Carrier Detect Tracking mode (when enabled,
this will cause the link to terminate automatically if
the line drops)
LIST Displays current settings
HELP Displays a brief help screen
Sample Link Startup Script
dev(atcp-ppp)
line sp(38kb) da(8) st(1) pa(n) hwflow(cts)
on timeout goto err
; Set PPP signon information
send attn ‘userid=userid’ enter
send attn ‘password=pswd’ enter
send clearbuf
; Initialize modem
send cr
send ‘AT &F1 E0 V1 &C1 &D2 Q0 S0=0 &B1 &A3’ cr
waitfor ‘OK’
send clearbuf
send ‘ATS7=60S19=0L0M1&M4&K1&H1&R2&I0B0X4’ cr
waitfor ‘OK’
send clearbuf
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