Memory Map; Memory Map Data Formats - GE Multilin 745 Communications Manual

CHAPTER 2: MODBUS PROTOCOL
Memory map data
formats
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
F1: Unsigned value (16 bits)
Example: 1234 stored as 1234
F2: Unsigned value, 1 decimal place (16 bits)
Example: 123.4 stored as 1234
F3: Unsigned value, 2 decimal places (16 bits)
Example: 12.34 stored as 1234
F4: Two's-complement signed value (16 bits)
Example: –1234 stored as –1234
F5: Two's-complement signed value, 1 decimal place (16 bits)
Example: –123.4 stored as –1234
F6: Two's-complement signed value, 2 decimal places (16 bits)
Example: –12.34 stored as –1234
F7: Unsigned long value (32 bits)
First block of 16 bits: high-order word of long value
Second block of 16 bits: low-order word of long value
Example: 123456 stored as 123456
F8: Unsigned long value, 1 decimal place (32 bits)
First block of 16 bits: high-order word of long value
Second block of 16 bits: low-order word of long value
Example: 12345.6 stored as 123456
F9: Unsigned long value, 2 decimal places (32 bits)
First block of 16 bits: high-order word of long value
Second block of 16 bits: low-order word of long value
Example: 1234.56 stored as 123456
F10: Two's-complement signed long value (32 bits)
First block of 16 bits: high-order word of long value
Second block of 16 bits: low-order word of long value
Example: –123456 stored as –123456
F11: Two's-complement signed long value, 1 decimal place (32 bits)
First block of 16 bits: high-order word of long value
Second block of 16 bits: low-order word of long value
Example: –12345.6 stored as –123456
F12: Two's-complement signed long value, 2 decimal places (32 bits)
First block of 16 bits: high-order word of long value
Second block of 16 bits: low-order word of long value
Example: –1234.56 stored as –123456
F13: Hardware revision (16-bit enumeration)
Value Description
1 Hardware revision A
2 Hardware revision B
3 Hardware revision C
4 Hardware revision D
5 Hardware revision E
Value Description
6 Hardware revision F
7 Hardware revision G
8 Hardware revision H
9 Hardware revision I
10 Hardware revision J
MODBUS PROTOCOL
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