104S
♦
ProLinx Gateway
IEC-60870-5-104 (104S) Protocol Implementation
(Firmware v3.00 and later)
Protocol Manual
ProSoft Technology, Inc.
Page 67 of 157
January 22, 2010
Monitored 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
0.39575
1953125
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.
Summary of Contents for ProLinx 104S
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