IEC-60870-5-104 (104S) Protocol Implementation
104S
♦
ProLinx Gateway
Protocol Manual
(Firmware v3.00 and later)
Page 78 of 157
ProSoft Technology, Inc.
January 22, 2010
The measured normalized points use a data representation defined by the protocol
specification to represent fractional decimal values. The following table describes the
value for each bit as a reciprocal power of two (2), that is two (2) raised to the power
of a negative exponent ( -1 through -15). Bit 15 is the Sign Bit.
Bit
15
14 13 12 11
10 9 8 7 6 5 4 3 2 1 0
Value
Hex
Decimal
S 2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-15
4000h
0.5
0
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0
2000h
0.25
0
0 1 0 0 0 0 0 0 0 0 0 0 0 0 0
1000h
0.125
0
0 0 1 0 0 0 0 0 0 0 0 0 0 0 0
6000h
0.75
0
1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
3210h
0.395751
953125
0
0 1 1 0 0 1 0 1 0 1 0 1 0 0 0
Examples:
A value of 4000hex (only Bit 14 set, all others clear) is interpreted as 0.5 decimal
A value of 2000hex (only Bit 13 set, all others clear) is interpreted as 0.25 decimal
A value of 1000hex (only Bit 12 set, all others clear) is interpreted as 0.125 decimal
... and so on until...
A value of 0001hex (Only Bit 0 set, all others clear) is interpreted as
0.000030517578125
Therefore, the actual data values transmitted may be any combination of the decimal
values for any given bit pattern.
Содержание ProLinx 104S
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