CONTREX MLP-Trim - Manual (Page 119)

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Character 12 - ETX:
Always use the ASCII “ETX” character to terminate the character string.
Example of Parameter Send:
A new Acceleration Time of 52.3 seconds is sent to the MLP–Trim at address 4.
ASCII character string: “STX0431605230ETX”
Note: The character string has no spaces between the integers.