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6.5.1 Database Starting Addresses
Table 6-4 provides the starting address and the number of datapoints for each data type in
the 17CA3000 Chloralert™ Plus.
6.5.2 Instrument Memory Address Scheme
The location of the datapoint in the instrument memory can be calculated from the base
address for that datapoint type. The datapoint types, with their base addresses and memory
location algorithms, are provided in Table 6-5 (subscripts H and D are used to denote hexa
decimal and decimal numbers respectively).
Refer to Figure 6-4 for floating point examples.
Table 6-5 Datapoint Address
Type
Base
Address
Address Calculation
B
2000
H
Address = B Base + (B Number)
= 800
H
+ (B Number)
Address example: B012 location
= 0800
H
+ 12
D
= 800H + C
H
= 80C
H
L
20C8
H
Address = L Base + (L Number/8)
= 84BH + (L Number/8)
Remainder = bit position in byte
Address example: L014 location
= 84B
H
+ 14/8 = 84C
H
, bit 6 (remainder)
C
20DC
H
Adress = C Base + (3 X C Number)
= 85B
H
+ (3 X C Number)
Address example: C011 location
85B
H
+ (3 X 11) + 85B
H
+ 33
D
=85BG + 21
H
+ 87C
H
.
H
2208
H
Address =
H
Base + (5 X Number)
= 9CF
H
+ (5 X
H
Number)
Address example: H001 location
9CF
H
+ (5 X 1) = 9CF
H
+ 5
D
= 9CF
H
+ 5
H
= 9D4
H
A
2348
H
Address = A Base + (10 X Number)
= 9EB
H
+ (10 X Number)
Address example: A015 location
9E8
H
+ (10 x 15) = 9E8
H
+ 150
D
+9E8
H
+ 96
H
A7E
H
.
Table 6-4 Database Starting Addresses
Type
Start Address
Number of Elements
Size of Element
B
2000
H
200
1
L
20C8
H
160
1/8
C
20DC
H
100
3
H
2208
H
20
5
A
2348
H
32
10
Table 6-3 Datapoint Types
Data Point
Size
Data Format Description
B
1 byte
It is a positive integer from 0 to 255.
L
1 bit
A single binary bit with a logical value of 0 to 1.
C
3 bytes
A floating point value that has a resolution of one part in 32,768 and a dynamic range of + 1038.
The first two bytes represent a 2’s complement notation in fractional for (2-n) whose absolute
value is between 0.5 and 0.9999. The third byte is the power of 2 in 2’s complement notation.
(See Figure C-1 for examples)
H
5 bytes
A floating point value that has a resolution of one part in 2 billion and a dynamic range of +
1038. 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. (See Figure C-1 for examples.)
A
10 bytes
A text string that is 10 characters maximum.
Address
Summary of Contents for Capital Controls CHLORALERT 17CA3000 Series
Page 14: ...325 6610 17 14 Figure 2 1 Receiver Outline Dimensions ...
Page 15: ... 15 325 6610 17 Figure 2 2 Sensor Transmitter Outline Dimensions ...
Page 16: ...325 6610 17 16 Figure 2 3 Interconnection Diagram ...
Page 18: ...325 6610 17 18 Figure 2 4 Sensor Wiring ...
Page 44: ...325 6610 17 44 ...