Micromod Micro-DCI: 53ML5100A LOADING STATION REV. 1 FIRMWARE - Manual (Page 16)

53ML5100A Manual Loading Station
Supplement to the Instruction Bulletin
12 Datalink Communications
H F00
H
5 Represents high precision floating point
values that have a resolution of one part in
2 billion (31 bits) and a dynamic range of
± 10
38
.
The first four bytes represent a 2’s
complement notation in fractional form
(2
-n
) whose absolute value is between 0.5
and 0.9999.
The fifth byte is the power of 2 in 2’s
complement notation. Floating point
example: 9C
H
00
H
00
H
00
H
07
H
= -100.
The 2’s complement notation bit in the
9 = 1 (1001) indicating a negative number;
therefore, 9C must be re-complemented.
9C = 1001 1100, change 1’s to 0’s and 0’s
to 1’s = 0110 0011 and add 1= 0110 0100
(64
H
). Fractional binary weights left to
right for 0110 0100 are 0 = 2’s
complement positive, 1 = 2
-1
= 1/2 = 0.5,
1 = 2
-2
= 1/4 = 0.25, 0=0, 0=0,
1= 2
-5
= 1/32 = 0.03125, 0=0, 0=0.
6
H
= 0.5 + 0.25 + 0.03125 = 0.78125.
07
H
=128
D
, 128
D
X 0.78125
D
= 100.
A negative sign is assigned (-100)
because the original 2’s complement
binary bit in the 9 (1001) of 9C was set
indicating a negative number.
Address =
H
Base + (5 X
H
Number)
= F00
H
+ (5 X
H
Number)
Address example: H001 location
F00
H
+ (5 X 1) = F00
H
+ 5
D
= F00
H
+ 5
H
= F05
H
.
A (F)* 1400
H
10 (A)
5 (F)*
The A data format represents text strings
that are 10 characters long.
The F data format represents text strings
that are 5 characters long. Address = A Base + (10 X Number)
= 1400
H
+ (10 X Number)
Address example: A015 location
1400
H
+ (10 X 15) =
1400
H
+ 150
D
= 1400
H
+ 96
H
1496
H
. (For A data type.)
Address = F Base + (5 X Number)
= 1400
H
+ (5 X Number)
(For F data type within A database.)
*F data types are 5 bytes long and are mapped onto A data types.
Table 4-2. Controller Memory Address Scheme (Continued)
Data
Type
Base
Memory
Address
Byte
Size
Data Format Address Calculation Algorithm