User`s manual

Moxa C Programmable RTU Controllers Managing Communications
4-12
Example 1: Connecting to a PPP Server over a Simple Dial-up
Connection
The following command is used to connect to a PPP server by modem. Use this command for old ppp servers
that prompt for a login name and password. Note that debug and default route 192.1.1.17 are optional.
#pppd connect ‘chat -v “ “ ATDT5551212 CONNECT “ “ ogin: username word: password’
/dev/ttyM0 115200 debug crtscts modem defaultroute
If the PPP server does not prompt for the username and password, the command should be entered as follows.
Replace username with the correct username and replace password with the correct password.
#pppd connect ‘chat -v “ “ ATDT5551212 CONNECT “ “‘user username password /dev/ttyM0
115200 crtscts modem
The pppd options are described below:
connect ‘chat etc...’
This option gives the command to contact the PPP server. The ‘chat’ program is used to dial a remote computer.
The entire command is enclosed in single quotes because pppd expects a one-word argument for the ‘connect’
option. The options for ‘chat’ are given below:
-v
verbose mode; log what we do to syslog
“ “
Double quotes—don’t wait for a prompt, but instead do ... (note that you must add a space after the second
quotation mark)
ATDT5551212
Dial the modem, and then ...
CONNECT
Wait for an answer.
“ “
Send a return (null text followed by the usual return)
login: username word: password
Log in with the username and password.
Refer to the chat man page, chat.8, for more information about the chat utility.
/dev/
Specify the callout serial port.
115200
The baudrate.
debug
Log status in syslog.
crtscts
Use hardware flow control between computer and modem (at 115200 this is a must).
modem
Indicates that this is a modem device; pppd will hang up the phone before and after making the call.