Seaward ClareHAL - Manual (Page 143)

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supplied (host supplies only 2 data bytes), then the host is defining a
single empty string.
Each string is placed at the beginning of a line, and the remainder of
the line is cleared. If text is required to be placed towards the right-
hand side of the display, then the text must be preceded by spaces. An
empty string simply clears an entire line. A host can define contiguous
empty strings by providing contiguous null terminators.
Although the host may supply strings that are longer than the screen
width, the tester will use only as many characters from each string as
are needed to fill a single line.
Your HAL tester