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Modbus RTU Functionality
Transmission Protocol
The COM16 module operates in the RTU transmission mode. ASCII transmission mode is not supported.
Overview of supported Functions
The COM16 module provides the following Modbus RTU function codes for accessing the data contained in the WL circuit breaker.
FC
Name
Description
02:
Read Discrete Inputs
Reads the state of the Bits in the Status Register
01:
Read Coils
Reads the state of multiple Control Bits and Extra Flags
05:
Write Single Coil
Sets the state of a single Control Bit or Extra Flag
15:
Write Multiple Coils
Sets the state of multiple Control Bits and Extra Flags
04:
Read Input Registers
Reads the Basic Data Registers. Three Basic Types (1, 2 and 3) are supported.
03:
Read Holding Registers
Reads a complete data set.
16:
Write Multiple Registers
Writes a complete data set.
07:
Read Exception Status
Reads the state of eight Exception Status bits
08:
Diagnostics
Function provides a method for checking the communication between the master
and the slave
11:
Get Comm Event Counter
Returns a status word and an event count from the communications event counter
12:
Get Comm Event Log
Returns a status word, event count, message count, and a field of event bytes
Summary of Contents for UL 489
Page 36: ...5 21 Frame size II 3000 A Frame size III 1 Holes 14 mm 0720 1 0721_nu ...
Page 63: ...7 2 Horizontal connectors 0733_nu top view ...
Page 64: ...7 3 Rear vertical connectors 0734_nu top view rear view ...
Page 65: ...7 4 Front connectors 0736_nu front view top view ...
Page 66: ...7 5 Front connectors and pressure wire terminals 0737_nu top view front view ...
Page 67: ...7 6 7 2 Frame size II fixed mounted version 0494 3_nu ...
Page 68: ...7 7 Class C always 0494 5_nu top view rear view ...
Page 69: ...7 8 2500 0738_nu LH side view front view ...
Page 71: ...7 10 7 4 Frame size III fixed mounted version 0495 1_nu LH side view ...
Page 72: ...7 11 0495 2_nu top view top view ...
Page 73: ...7 12 0495 3_nu top view rear view ...
Page 75: ...7 14 7 5 Door cut outs fixed mounted circuit breaker Frame size I 0735_nu ...
Page 76: ...7 15 Frame size II III 0496_nu ...
Page 77: ...7 16 7 6 Frame size I draw out version 0745_nu ...
Page 78: ...7 17 0746_nu rear view top view ...
Page 79: ...7 18 0747_nu bottom view ...
Page 80: ...7 19 0748_nu ...
Page 81: ...7 20 0749_nu ...
Page 82: ...7 21 7 7 Frame size II draw out version 0490 1_ul ...
Page 86: ...7 25 7 8 Frame size III draw out version ...
Page 87: ...7 26 ...
Page 88: ...7 27 ...
Page 89: ...7 28 7 9 Door cut outs for draw out circuit breakers Frame size I 0750_nu ...
Page 91: ...7 30 7 11 External sensor for neutral conductor WLNCT2 ...
Page 92: ...7 31 WLNCT3 ...
Page 107: ...9 5 I tripping Ground fault tripping ...
Page 351: ......