GE Multilin 745 Communications Manual page 83

CHAPTER 2: MODBUS PROTOCOL
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
F31: Baud rate (16-bit enumeration)
Value Baud rate
0 300 baud
1 1200 baud
2 2400 baud
3 4800 baud
4 9600 baud
5 19200 baud
F32: Default message (32 bits)
Internally defined
F33: ASCII text characters (16 bits)
First block of eight bits: first ASCII character, 0 to 255 in steps of 1
Second block of eight bits: second ASCII character, 0 to 255 in steps of 1
Example: "AN" stored as 414Eh = 16718 decimal
F34: Relay energization state (16-bit enumeration)
Value Relay state
0 De-energized
1 Energized
F35: Relay conditions (16-bit bitmask)
Bitmask Description
–––– –––– –––– –––1 Active trip condition
–––– –––– –––– ––1– Active alarm condition(s)
–––– –––– –––– –1–– Pickup condition
–––– –––– –––1 –––– Phase A fault
–––– –––– ––1– –––– Phase B fault
–––– –––– –1–– –––– Phase C fault
–––– –––– 1––– –––– Ground fault
F36: Overcurrent curve shape (16-bit enumeration)
Value Curve shape
0 IEEE extremely inverse
1 IEEE very inverse
2 IEEE normally inverse
3 IEEE moderately inverse
4 Definite time
5 IEC curve A
6 IEC curve B
7 IEC curve C
F37: Rated winding temperature rise (16-bit enumeration)
Value Temperature rise
0 55°C (oil)
1 65°C (oil)
2 80°C (dry)
3 115°C (dry)
4 150°C (dry)
Value Curve shape
8 IEC short inverse
9 IAC extremely inverse
10 IAC very inverse
11 IAC inverse
12 IAC short inverse
13 FlexCurve™ A
14 FlexCurve™ B
15 FlexCurve™ C
MODBUS PROTOCOL
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