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Each Vue Series Controller is shipped from the factory with a fixed baud rate, which cannot be changed in the field. The other serial port parameters are: 8 data bits, 1 stop bit and no parity. Hardware flow control is not supported.
Each command to the Controller must be terminated in one of two equivalent ways:
A line feed or “new line” character (ASCII 10).
A “greater than” character '>' (ASCII 62)
All commands are case-sensitive. Leading and trailing white space is ignored, but command arguments must be delimited by a single space character (ASCII 32).
Under no circumstances does the Controller initiate communication; it only transmits characters in response to a message. Every message to the controller generates a response, either a numerical value or the acknowledgment string “OK”.
In the event that the controller receives a message that it cannot interpret, it responds: “Syntax error: ” followed by the complete command string (minus the termination character) that caused the error.
Every controller response is terminated by a carriage return/line feed pair (ASCII 13 followed by ASCII 10).