AppendixA:Modbusprotocol
50 User’sManual
Data types decoding
Type Bit mask Description
T1
Unsigned Value (16 bit)
Example: 12345 = 3039(16)
T2
Signed Value (16 bit)
Example: -12345 = CFC7(16)
T3
Signed Long Value (32 bit)
Example: 123456789 = 075B CD 15(16)
T4
bits # 15…14
bits # 13…00
Short Unsigned float (16 bit)
Decade Exponent(Unsigned 2 bit)
Binary Unsigned Value (14 bit)
Example: 10000*102 = A710(16)
T5
bits # 31…24
bits # 23…00
Unsigned Measurement (32 bit)
Decade Exponent(Signed 8 bit)
Binary Unsigned Value (24 bit)
Example: 123456*10-3 = FD01 E240(16)
T6
bits # 31…24
bits # 23…00
Signed Measurement (32 bit)
Decade Exponent (Signed 8 bit)
Binary Signed value (24 bit)
Example: - 123456*10-3 = FDFE 1DC0(16)
T7
bits # 31…24
bits # 23…16
bits # 15…00
Power Factor (32 bit)
Sign: Import/Export (00/FF)
Sign: Inductive/Capacitive (00/FF)
Unsigned Value (16 bit), 4 decimal places
Example: 0.9876 CAP = 00FF 2694(16)
T9
bits # 31…24
bits # 23…16
bits # 15…08
bits # 07…00
Time (32 bit)
1/100s 00 - 99 (BCD)
Seconds 00 - 59 (BCD)
Minutes 00 - 59 (BCD)
Hours 00 - 24 (BCD)
Example: 15:42:03.75 = 7503 4215(16)
T10
bits # 31…24
bits # 23…16
bits # 15…00
Date (32 bit)
Day of month 01 - 31 (BCD)
Month of year 01 - 12 (BCD)
Year (unsigned integer) 1998..4095
Example: 10, SEP 2000 = 1009 07D0(16)
T16
Unsigned Value (16 bit), 2 decimal places
Example: 123.45 = 3039(16)
T17
Signed Value (16 bit), 2 decimal places
Example: -123.45 = CFC7(16)
T_Str4 Text: 4 characters (2 characters for 16 bit register)
T_Str6 Text: 6 characters (2 characters for 16 bit register)
T_Str8 Text: 8 characters (2 characters for 16 bit register)
T_Str16 Text: 16 characters (2 characters for 16 bit register)
T_Str40 Text: 40 characters (2 characters for 16 bit register)
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