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4.2 Character Data Format
Communications to/from the unit use the RS-422 serial port connections defined in Table 4-1.
The message characters are comprised of words of 10 bits: one start bit, eight data bits, one
stop bit, and no parity (8-N-1). The default baud rate is listed in Section 10.
When in Configuration Mode, the characters listed in Table 4-2 are reserved for use as
delimiters. No other characters are reserved in any mode. The character set in use is a subset
of standard ASCII. The only characters that are used are those with values between 0x20 and
0x7E, as well as any listed in Table 4-2. All other characters are unused.
Table 4-2: Reserved Characters in Human-Readable Modes
Note 1: A carriage return, a line feed, or both are all valid end of command delimiters.
When in Configuration Mode, either an illegal character may be ignored or the unit’s response
will indicate an error and possibly suggest the correct message syntax.
When in Normal Mode, user input commands or queries and commands that include illegal
characters will typically be ignored without any response. However, a few special input
commands are permitted as ASCII text.
When in Normal Mode, the data output is typically in binary format (not ASCII encoded) and
there are no reserved characters; all characters from 0x00 to 0xFF are legal at all times. (See
Section 5 for a description of the output in Normal Mode.)
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