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Program to check the serial communication


is there a program to run a check on the serial communication instead of individual commands (in PuTTY - ie -$GV  .... etc) which will give a result  serial communication  OK or Failed? 

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A command and response in PuTTY is enough to prove serial is communicating correctly. 

If you enter $SC 40 and Receive OK, possibly with other characters such as ^xx the command was received and processes.

If you enter something random and receive NK (Not Okay), the command was received but not valid

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