GE Multilin 745 Communications Manual page 76

MODBUS PROTOCOL
2–70
F14: Software revision (16 bits)
First block of four bits (0000 ---- ----- ----): not used
Second block of four bits (---- 0000 ---- ----): major revision number, 0 to 9 in steps of 1
Third block of four bits (---- ---- 0000 ----): minor revision, 0 to 9 in steps of 1
Fourth block of four bits (---- ---- ---- 0000): ultra-minor revision, 0 to 9 in steps of 1
Example: 2.83 stored as 0283 hex (643 decimal)
F15: Installed options (16-bit bitmask)
Bitmask Description
–––– –––– –––– –––0 Two windings per phase
–––– –––– –––– –––1 Three windings per phase
–––– –––– –––– ––0– Phase current inputs winding 1 rating = 1 A
–––– –––– –––– ––1– Phase current inputs winding 1 rating = 5 A
–––– –––– –––– –0–– Phase current inputs winding 2 rating = 1 A
–––– –––– –––– –1–– Phase current inputs winding 2 rating = 5 A
–––– –––– –––– 0––– Phase current inputs winding 3 rating = 1 A
–––– –––– –––– 1––– Phase current inputs winding 3 rating = 5 A
–––– –––– –––0 –––– Ground current inputs winding 1/2 rating = 1 A
–––– –––– –––1 –––– Ground current inputs winding 1/2 rating = 5 A
–––– –––– ––0– –––– Ground current inputs winding 2/3rating = 1 A
–––– –––– ––1– –––– Ground current inputs winding 2/3 rating = 5 A
–––– –––– –0–– –––– Low control power (0 to 60 V DC)
–––– –––– –1–– –––– High control power (90 to 300 V DC; 70 to 265 V AC)
–––– –––– 0––– –––– No analog inputs/outputs installed
–––– –––– 1––– –––– Analog inputs/outputs installed
–––– –––0 –––– –––– No loss-of-life option installed
–––– –––1 –––– –––– Loss-of-life option installed
–––– ––0– –––– –––– No restricted ground fault option installed
–––– ––1– –––– –––– Restricted ground fault option installed
–––– –0–– –––– –––– No Enhanced Display
–––– –1–– –––– –––– Enhanced Display is installed
–––– 0-–– –––– –––– No Ethernet option
–––– 1-–– –––– –––– Ethernet option is installed
–––0 -––– –––– –––– Regular environment option
–––1 -––– –––– –––– Harsh environment option
F16: Demand interval response (16-bit enumeration)
Value Demand interval
0 5 minutes
1 10 minutes
2 15 minutes
3 20 minutes
4 30 minutes
5 60 minutes
F17: Communications hardware (16-bit enumeration)
Value Communications port
0 RS485
1 RS422
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 2: MODBUS PROTOCOL