4BDATA PACKAGE FRAMES
0BMODBUS RTU PROTOCOL
Response sent by slave node:
Slave address – 1 byte
Function code – 1 byte
Data – Variable number of bytes depending on the function code
CRC –2 bytes to verify errors
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 packages sent by the master station, this field
indicates the slave (smART P500), while in the packages received by the master station
indicates the direction of the slave that responds.
The function code is the second byte of all the packages. The MODBUS protocol defines
function codes from 1 to 127. The relay uses a subset of these codes. In the transmission
of a request from the master node, this field informs the slave device the function that the
master node requests. If the function code in the response of the slave is the same, the
requested function was performed by the slave. However, if the most significant bit of the
function code is 1, the slave will indicate an error condition and will send an exception
code.
The field data contains a variable number of bytes whose length depends on the function
code requested or answered. It is the useful information exchanged between the master
node and slave node. This field contains the addresses of the points requested by the
master node or the result produced by the slave.
Finally, the field CRC contains an error detection code. It is two bytes long and contains the
result of a numerical algorithm applied to the data. When a device transmits a message,
calculates that value and adds it to the data package. The device receives the message,
performs the same calculation and compares its result with the code received. If it gets the
same result, the data package is considered correct, while a difference causes the package
to be considered wrong.
Содержание smART P500
Страница 1: ...Instruction Manual Multifunction Protection Relay smART P500...
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Страница 39: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 9 Wye Wye Connection measured neutral...
Страница 40: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 10 Wye Wye Connection sensitive neutral...
Страница 41: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 11 Open Delta Connection measured neutral...
Страница 42: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 12 Open Delta Connection sensitive neutral...
Страница 499: ...1BIEC 255 4 AND BS142 CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 1 Standard inverse IEC Curve...
Страница 501: ...1BIEC 255 4 AND BS142 CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 2 Very inverse IEC Curve...
Страница 503: ...1BIEC 255 4 AND BS142 CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 3 Extremely inverse IEC curve...
Страница 505: ...1BIEC 255 4 AND BS142 CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 4 Short inverse IEC curve...
Страница 507: ...1BIEC 255 4 AND BS142 CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 5 Long inverse IEC curve...
Страница 511: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 6 Moderately ANSI curve...
Страница 513: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 7 Very inverse ANSI curve...
Страница 515: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 8 Extremely inverse ANSI curve...
Страница 532: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 14 Recloser Curves 101 119...
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Страница 541: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 17 Recloser Curves 25 Amp 35 Amp A B C D E...
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