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3.3 Error Messages Invalid commands will be acknowledged with an error response. An error response will consist of 4 ASCII bytes followed by a carriage return. The error code consists of the two characters ER followed by a two-character error status code. ERIC<CR> Invalid command The command was not recognized because it was not in the proper format. ERIN<CR> Invalid number or range The data included in the previous command was invalid or outof-range. Page 15