The Bit tab shows a binary view of the current message. (Note: This tab is only available for PER or UPER messages).
The leftmost column (labeled Address) shows the offset of each line within the message.
The group of columns in the middle (labeled 0-7 through 56-63) shows the encoded message data in binary, one byte per column.
The rightmost column (labeled Text) shows an ASCII representation of the data whenever possible, otherwise showing a "." for each non-ASCII byte.