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40 — FAQ AND TROUBLESHOOTING
GENERAL MANUAL — SEP 8, 2022 — RELEASE: V1.0.2
However, if you have never set it up, you probably need to add your linux user to the
dialout
group to
grant right access to the serial port resources. To do so, just open a terminal and execute the following
command:
sudo gpasswd -a <user_name> dialout
where you need to replace the
<user_name>
with your current linux username.
Microsoft Windows
Install the driver for your operating system version to allow the serial port access through something like
`COM7`
.
8.1.3 API installation requirements
Before using the qbAPI on your system, if not already installed it is good use to install a c++ compiler.
Below here are listed all the necessary instructions for each operative system.
NOTE:
Note: don't forget to logout or reboot.

1.
2.
3.
4.
WARNING:
Be aware that we support only serial port names between
`COM1`
and
`COM9`
.
Each time you connect a new device to your PC (or even a device to a new PC), you should
check whether it has been set in the proper port range or not.
To change the serial port number:
go under
"Control Panel > Hardware and Sound > Device Manager"
;
explore the
"Ports (COM & LPT)"
branch, right-click on the displayed
`COM`
port
and select
"Proprieties"
;
from there, select the
"Port Settings"
tab and click on the
"Advanced"
button
;
lastly, choose from the drop-down menu a
`COM`
number between
`COM1`
and
`COM9`
and click on
"OK"
.
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