What is the Difference Between Active and Passive Serial Connection in CDU/Connect?
The default serial port connection method in NovAtel Connect is set as Active. This means that if the baud rate set in the receiver for that particular COM port is different from the one specified by the user, Connect will send a "break" signal at connection establishment to reset the port to its default 9600 and then will reconfigure it to the baud rate specified by the user.
Users also have the option of using a Passive connection during COM port setup in Connect. A passive connection means no breaks are sent at connection establishment meaning that if the baud rate stored in the receiver for that particular COM port is different from the one specified by the user, NovAtel Connect will be unable to establish a connection with the receiver. This is the same behaviour that can be seen in third party terminal emulator applications such as Hyperterminal, PutTTy, etc. In these third party applications, users will be unable to communicate with the unit should they specify a different baud rate than what is stored for that particular COM port.
Please note that in order for Active to work as mentioned above, the respective COM port must be configured to have break detections active. This can be done by setting the eighth parameter in SERIALCONFIG to ON. Please refer to the latest OEM6 Family Firmware Reference Manual for more information on the SERIALCONFIG command. The latest version can be found in http://www.novatel.com/assets/Documents/Manuals/om-20000129.pdf.
In other words, if my break parameter is set as OFF and I try to connect to a different baud rate than what is currently set for the COM port, I won't be able to communicate with the receiver, even if the connection type is set as Active.