In the event that Alert makes voice calls with a GSM M100 3G modem and these seem cut off and/or broken, here are the steps to follow to resolve the problem:
- Connection Type:
The way your GSM modem and the Alert station are connected may impose some limitations.
Voice calls require a speed of 230 400 bauds when the modem is connected through a USB/serial converter or IP/serial converter. When the modem is directly connected to a COM port of the computer, the speed for voice call is only 115 200 bauds.
SMS operates at a minimum of 115 200 bauds.
- Check the configuration in Alert
It is possible that some parameters are incomplete or that they have been changed during your use. Here are the ones we recommend:
Go to Configuration -> Communication -> Properties of your Com port.
Check if it matches with your settings, especially for the speed.
Then click on "..." of Voice Modem and compare again:
Exit by clicking OK and wait until your modem is ready again.
- Re configuring the serial/IP converter
If your installation is equipped with a serial/IP converter as a MOXA, the recommended settings may not solve the problem. You need to reconfigure the communication speed. We advise you to close Alert and use SiWiUpdate for the next steps:
Launch SiWiUpdate and connect to the GSM modem.
Go to the Terminal tab and write in the bar at the bottom of the program the command: AT+IPR=230400.
Click on Send then enter : AT&W and click on Send again.
After these commands, you should be disconnected from the Com port.
You can, if you wish, check that the commands have been taken by reconnecting to SiWiUpdate (remember to change the speed from 115200 to 230400 bauds). Go back to the Terminal tab and write the command: AT+IPR? then click on the button Send.
The following answer should be displayed:
Close SiWiUpdate then launch Alert.
You will then need to change the speed of the COM port from 115200 to 230400.