QNx4.22 Modem and tinit examples.

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Title: QNx4.22 Modem and tinit examples.
Keywords:QNX4.xx modems tinit
Author: KAM
Date: Nov 29 1996
kdb Number: kdb-066
Dist: External


How to get QNX4.xx to answer a modem on a serial port and send a login.

To do this we use the "modem" command and tinit.


EXAMPLES

tinit -c "modem -b (baud) -L" -t /dev/nt16 &

Or
tinit -t con1 con2 -c "modem -b (baud) -L" -t /dev/nt16 &
To start up two virtual consoles as well as the "modem" program.


NOTES:
-c :Tinit will start the following command specified by -c on the
devices specified by -t. (-t) to start program immediately on
the device.
-b :The "modem" command to set baud rate.
Under Qnx4 The Nt960 baud settings for are
57600 50
64000 75
76800 110
115200 134.
-L :Use locked baud rate.


-It was found that the description of the device connected to the MODEM
must be after the "modem" command and not before. See examples illustrating
the importance of positioning...............

tinit -t /dev/nt16 -c "modem -b (baud) -L" & {this won't work}

tinit -c "modem -b (baud) -L" -t /dev/nt16 & {,but this will work}


-Use these AT commands to set up the MODEM...AT E1 Q0 V1 X1 &C1 &D2.

-Other values can be specified for "modem" such as parity,stop and start.
See the QNX4 manual under "modem" for great detail.


Description: When someone phones the MODEM, the string "ring" is sent to
the computer from the MODEM. The program "modem" will then recognize this
as a ring and will tell the MODEM to answer. When the two MODEMs are
setup and in contact, "modem" will then die and the port is handed over to
tinit who then throws a login on that port.