Hioki 8910, Instruction Manual

Page: 64 / 150

6.2 Editing the CAN Definition Data
56
6.2.5 Setting the sign
This is used to set whether the pertinent data has a sign.
When "with sign" is set in “positive
→
negative" sign conversion, one's
complement only interchanges 0 and 1 in binary notation, whereas
two's complement adds 1 after 0 and 1 are interchanged.
Example : In the 16-bit data shown in the diagram, when the value of Byte 0 is FF and the
value of Byte 1 is 00, the following value results according to the method used:
Value based on U/L (Motorola) : FF00
Value based on L/U (Motorola) : 00FF
Value based on L/U (Intel)
: 00FF
(The data start position is 8 in Motorola format, and 0 in Intel format.)
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4
・・・
byte 0 byte 1 byte 2 byte 3
Data frame beginning
Data frame end
→
Unsigned
Without sign
1-Signed
With sign
(with negative number being one's complement)
2-Signed
With sign
(with negative number being two's complement)
Example : Data with a data length of one byte
Unsigned : 0 to +255 (00h to FFh)
1-Signed : -127 to +127 (80h to 7Fh)
2-Signed : -128 to +127 (80h to 7Fh)

-1 in 2-Signed is FFh, but -1 in 1-Signed results in FEh.
When the data length is 1 bit, only Unsigned can be selected.