278 programming appendix a – Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-MMA21 User Manual
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278
Programming
Appendix A
Note Signed BCD Data
Signed BCD data is a special data format that is used to express negative numbers in BCD. Although
this format is found in applications, it is not strictly defined and depends on the specific application. The
FQM1 supports four data formats and supports the following instructions to convert the data formats:
SIGNED BCD-TO-BINARY: BINS(470) and SIGNED BINARY-TO-BCD: BCDS(471). Refer to the
Instructions Reference Manual (Cat. No. O011) for more information.
Decimal
Hexadecimal
Binary
BCD
0
0
0000
0000
1
1
0001
0001
2
2
0010
0010
3
3
0011
0011
4
4
0100
0100
5
5
0101
0101
6
6
0110
0110
7
7
0111
0111
8
8
1000
1000
9
9
1001
1001
10
A
1010
0001
0000
11
B
1011
0001
0001
12
C
1100
0001
0010
13
D
1101
0001
0011
14
E
1110
0001
0100
15
F
1111
0001
0101
16
10
10000
0001
0110
Decimal
Unsigned binary (4-digit hexadecimal)
Signed binary (4-digit hexadecimal)
+65,535
FFFF
Cannot be expressed.
+65,534
FFFE
.
.
.
.
.
.
+32,769
8001
+32,768
8000
+32,767
7FFF
7FFF
+32,766
7FFE
7FFE
.
.
.
.
.
.
.
.
.
+2
0002
0002
+1
0001
0001
0
0000
0000
–1
Cannot be expressed.
FFFF
–2
FFFE
.
.
.
.
.
.
–32,767
8001
–32,768
8000