User guide

Chapter 6 – Reset Utility
16 MultiModem ISI Server Cards User Guide
If you did not select the first COM port, the following error message displays.
Using the Linux Port Reset Utility
The port-reset utility allows you to reset ports and modems without rebooting.
To reset a serial port, the DTR pin is set to the low logic level for one second. To reset the modem port, the Reset
pin is toggled (i.e., its logic state is inverted and then restored).
To reset the port (for a serial card) or modem (from modem card)
● Run the reset port command:
"resetport /dev/ttyMUxy"
Where 'x' stands for card number and 'y' for the port number.
On the Modem Cards, the DTRLED will toggle indicating that the reset has occurred. This toggling might be
observable on the modem attached to the port, if the modem is equipped for this indication. There is no similar
indication of successful reset on the modem cards.