Possible noise on the serial communication due to flow control and high baud rate
There could be a case when you see garbage characters on the serial connection interface. This behaviour may be caused by electrical noise on the serial connection. When the target device console port does not provide DSR, DCD and CTS signals, it is not a full RS232 serial port. Vendors, sometimes, use this simplification because most of the time they don't have noise issues or a need for hardware flow control, until there is an issue.
Example is the Serial Statistics where port 5 and 9 have only RTS and DTR signals.
One solution to reduce noise is to reduce the baud rate on both sides. By reducing the baud rate, we reduce the chance of noise, which manifests itself as garbage characters on the interface.
In this case, you need reconfiguration, you can try to reconfigure to lower baud rate (9600 bps) via serial port itself, even though there are some unexpected characters. Change the target device side and then match the config on Nodegrid.
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