GE Multilin 745 Communications Manual page 100

MODBUS PROTOCOL
2–94
F96: Unsigned value, auto-ranging based on winding 1 phase CT primary (32 bits)
For winding 1 phase CT primary ≤ 2 A, format F96 is an unsigned value with three decimal
places. For example, 1.234 is stored as 1234.
For 2 A < winding 1 phase CT primary ≤ 20 A, format F96 is an unsigned value with two
decimal places. For example, 12.34 is stored as 1234.
For 20 A < winding 1 phase CT primary ≤ 200 A, format F96 is an unsigned value with one
decimal place. For example, 123.4 is stored as 1234.
For winding 1 phase CT primary > 200 A, format F96 is a standard unsigned value.
For example, 1234 is stored as 1234.
F97: Unsigned value, auto-ranging based on winding 2 phase CT primary (32 bits)
For winding 2 phase CT primary ≤ 2 A, format F97 is an unsigned value with three decimal
places. For example, 1.234 is stored as 1234.
For 2 A < winding 2 phase CT primary ≤ 20 A, format F97 is an unsigned value with two
decimal places. For example, 12.34 is stored as 1234.
For 20 A < winding 2 phase CT primary ≤ 200 A, format F97 is an unsigned value with one
decimal place. For example, 123.4 is stored as 1234.
For winding 2 phase CT primary > 200 A, format F97 is a standard unsigned value.
For example, 1234 is stored as 1234.
F98: Unsigned value, auto-ranging based on winding 3 phase CT primary (32 bits)
For winding 3 phase CT primary ≤ 2 A, format F98 is an unsigned value with three decimal
places. For example, 1.234 is stored as 1234.
For 2 A < winding 3 phase CT primary ≤ 20 A, format F98 is an unsigned value with two
decimal places. For example, 12.34 is stored as 1234.
For 20 A < winding 3 phase CT primary ≤ 200 A, format F98 is an unsigned value with one
decimal place. For example, 123.4 is stored as 1234.
For winding 3 phase CT primary > 200 A, format F98 is a standard unsigned value.
For example, 1234 is stored as 1234.
F99: Port used for DNP communications (16-bit enumeration)
Value Port
0 None
1 COM1
2 COM2
3 Front panel port
F100: Cooling type for dry transformer (16-bit enumeration)
Value Cooling type
0 Sealed self-cooled
1 Vented self-cooled
2 Forced cooled
F101: Unsigned value, auto-ranging load loss at rated load (16 bits)
For low voltage winding rating ≥ 5 kV, format F101 is a standard unsigned value. For
example, 1234 is stored as 1234.
For 1 kV ≤ low voltage winding rating < 5 kV, format F101 is an unsigned value with one
decimal place. For example, 123.4 is stored as 1234.
For low voltage winding rating < 1 kV, format F101 is an unsigned value with two decimal
places. For example, 12.34 is stored as 1234.
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 2: MODBUS PROTOCOL