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2BPROTOCOL FEATURES
0BHARRIS 5000 PROTOCOL
The seventh bit indicates the direction of message (SOM bit). Only the first byte of a
frame in a Master -> RTU direction will have this bit set to 1.
A complete sequence of request / response using the protocol includes the following
bytes, which are sent in individual frames.
Requests sent by the master node:
Slave address – 1 byte. (Bit SOM set to 1 + 6 bits for address)
Function code – 1 byte (6 bits)
Data – Variable number of bytes depending on the function code (6 bits per byte)
(from 0 to 7 characters)
LRC – 1 byte with the LRC algorithm for error checking (6 bits)
Responses sent by the slave node:
Slave address – 1 byte. (Bit SOM set to 1 + 6 bits for address)
Function code – 1 byte (6 bits)
Data – Variable number of bytes depending on the function code (6 bits per byte)
(from 0 to 457 characters)
LRC – 1 byte with the LRC algorithm for error checking (6 bits)
The
slave address
is the first byte of all the packages. Contains the address assigned
by the user to the device. Each slave device must have a different address if more than
one is present in the same communication cable. In the packages sent by the station
master, this field indicates the slave (smART), while in the packages received by the
master station indicates the direction of the slave that responds.
Bit SOM (Start of Message), the seventh bit of a byte, is set to one only by the master in
the first byte of a frame, the one which includes the slave address.
The
function code
is the second byte of all the packages. The HR5000 protocol defines
function codes from 0 to 16. The smART uses a subset of these codes.
The field
data
contains a variable number of bytes whose length depends on the
function code that is requested or responded. It is the useful information exchanged
Summary of Contents for smART P500
Page 1: ...Instruction Manual Multifunction Protection Relay smART P500...
Page 23: ...2BTABLES INDEX THIS PAGE HAS BEEN LEFT BLANK INTENTIONALLY...
Page 39: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 9 Wye Wye Connection measured neutral...
Page 40: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 10 Wye Wye Connection sensitive neutral...
Page 41: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 11 Open Delta Connection measured neutral...
Page 42: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 12 Open Delta Connection sensitive neutral...
Page 511: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 6 Moderately ANSI curve...
Page 513: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 7 Very inverse ANSI curve...
Page 515: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 8 Extremely inverse ANSI curve...
Page 532: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 14 Recloser Curves 101 119...
Page 535: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 15 Recloser Curves 120 142...
Page 538: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 16 Recloser Curves 151 202...