The protocols run at 38400 baud which is as fast as RS-232 serial can go.
There is no idea of a "connection" or a "packet of information".
A multi-byte command is sent and then a multi-byte response is expected.
There are many ways for this to go wrong!
When the response is "nonsense" (including some time out values), a RESET is required.

The typical serial device does not implement any kind of idea a "connection".

In reply to Re^2: Assist human unobtrusively in a 3rd party Windows GUI by Marshall
in thread Assist human unobtrusively in a 3rd party Windows GUI by Marshall

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