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HMR2300
DATA FORMATS
The HMR2300 transmits each X, Y, and Z axis as a 16-bit value. The output data format can be either 16-bit signed binary
(sign plus 15 bits) or a binary coded decimal (BCD) ASCII characters. The command *ddA will select the ASCII format
and *ddB will select the binary format.
The order of ouput for the binary format is Xhi, Xlo, Yhi, Ylo, Zhi, Zlo. The binary format is more efficient for a computer to
interpret since only 7 bytes are transmitted. The BCD ASCII format is easiest for user interpretation but requires 28 bytes
per reading. There are limitations on the output sample rate (see table below) based on the format and baud rate
selected. Examples of both binary and BCD ASCII outputs are shown below for field values between 2 gauss.
Field
(gauss)
BCD ASCII
Value
Binary Value (Hex)
High Byte Low Byte
+2.0
+1.5
+1.0
+0.5
0.0
-0.5
-1.0
-1.5
-2.0
30,000
22,500
15,000
7,500
00
-7,500
-15,000
-22,500
-30,000
75
57
3A
1D
00
E2
C3
A8
8A
30
E4
98
4C
00
B4
74
1C
D0
Binary Format: 7 Bytes
X H | X L | Y H | Y L | Z H | Z L | <cr>
X H = Signed Byte, X axis
X L = Low Byte, X axis
<cr> = Carriage Return (Enter key), Hex Code = 0D
ASCII Format: 28 Bytes
SN | X1 | X2 | CM | X3 | X4 | X5 | SP | SP | SN | Y1 | Y2 | CM | Y3 | Y4 | Y5 | SP | SP | SN | Z1 | Z2 | CM | Z3 | Z4 | Z5 | SP
| SP |<cr>
The ASCII characters will be readable on a monitor as sign decimal numbers. This format is best when the user is
interpreting the readings.
PARAMETER SELECTION VERSUS OUTPUT SAMPLE RATE
Sample
Rate
ASCII
Binary
f 3dB
Notch
Command Input
Rate – min.
(sps)
10
20
25
30
40
50
60
100
123
154
9600
yes
yes
yes
yes
no
no
no
no
no
no
19,200
yes
yes
yes
yes
yes
yes
no
no
no
no
9600
yes
yes
yes
yes
yes
yes
yes
yes
no
no
19,200
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
(Hz)
17
17
21
26
34
42
51
85
104
131
(Hz)
50/60
50/60
63/75
75/90
100/120
125/150
150/180
250/300
308/369
385/462
(msec)
20
20
16
14
10
8
7
4
3.5
3
8
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