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Brainboxes ED-549 - Page 96

Brainboxes ED-549
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Product Manual V1.2
© Copyright Brainboxes Ltd
Page 96 of 100
Floating-point values are encoded according to the IEEE 754 standard for 32-bit floating-point numbers. Each
value takes two sequential 16-bit Modbus registers, with the least-significant bits of the 32-bit value being held
in the lower register address (“little-endian” format). Both Modbus registers must be read in the same
Modbus request. The units of the float values are Volts or milliAmps.
Under-range inputs result in a reading equal to the Full Scale value, and over-range inputs result in a reading
equal to the +Full Scale value.The type/range codes which can be set using Modbus, and the data ranges they
result in, are tabulated below. The codes are the same as for the ASCII protocol.
Type Code
Input Type
Data Format
+ Full Scale
- Full Scale
05
±2.5V
Float engineering unit
+2.5
-2.5
Integer hexadecimal
0x7FFF = 32767
0x8000 = -32768
Integer engineering unit
25000
-25000
06 or 0D
±20mA
Float engineering unit
+20.0
-20.0
Integer hexadecimal
0x7FFF = 32767
0x8000 = -32768
Integer engineering unit
-20000
20000
07
+4 to +20mA
Float engineering unit
+20.0
+4.0
Integer hexadecimal
0xFFFF = 65536
0x0000 = 0
Integer engineering unit
4000
20000
08
±10V
Float engineering unit
+10.0
-10.0
Integer hexadecimal
0x7FFF = 32767
0x8000 = -32768
Integer engineering unit
10000
-10000
09
±5V
Float engineering unit
+5.0
-5.0
Integer hexadecimal
0x7FFF = 32767
0x8000 = -32768
Integer engineering unit
5000
-5000
04 or 0A
±1V
Float engineering unit
+1.0
-1.0
Integer hexadecimal
0x7FFF = 32767
0x8000 = -32768
Integer engineering unit
10000
-10000
03 or 0B
±500mV
Float engineering unit
+500.0
-500.0
Integer hexadecimal
0x7FFF = 32767
0x8000 = -32768
Integer engineering unit
5000
-5000
0C
±150mV
Float engineering unit
+150.0
-150.0
Integer hexadecimal
0x7FFF = 32767
0x8000 = -32768
Integer engineering unit
15000
-15000
1A
0 to +20mA
Float engineering unit
+20.0
+0.0
Integer hexadecimal
0xFFFF = 65536
0x0000 = 0
Integer engineering unit
20000
0
3A
±75mV
Float engineering unit
+75.0
-75.0
Integer hexadecimal
0x7FFF = 32767
0x8000 = -32768
Integer engineering unit
7500
-7500
3B
±250mV
Float engineering unit
+250.0
-250.0
Integer hexadecimal
0x7FFF = 32767
0x8000 = -32768
Integer engineering unit
25000
-25000

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