История
7 июля 2021
Часть переводимой страницы Протокол Modbus.
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FuzzyBot переименовал страницу Протокол Modbus/en в Modbus/en без оставления перенаправления: Часть переводимой страницы Протокол Modbus.
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29 марта 2020
3 июня 2019
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Новая страница: «In the case of limited computing resources for the calculation of the checksum, there is a function that uses table values (also given in the specification).»
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Новая страница: «For the Modbus RTU Protocol, the 16-bit checksum (CRC) is calculated using the algorithm described in the [http://www.modbus.org/specs.php Modbus] specification…»
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Новая страница: «=== Modbus checksum calculation ===»
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Новая страница: «{|class="wikitable" align="center" !Error Code || Error name|| Meaning |- ! 1 | Illegal Function || An invalid function code was sent in the request |- !…»
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Новая страница: «The most common Modbus error codes are listed in the following table:»
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Новая страница: «600px|thumb|center|Transaction failed In this case, we tried to access the nonexistent register address 0xFFFF and tried to read 8 f…»
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Новая страница: «If the request cannot be processed by the server device for one reason or another, it sends an error message in response. The error message contains the address o…»
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Новая страница: «=== Modbus Exception codes (errors) ===»
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Новая страница: «{|class="wikitable" align="center" !Function code || Request || Reply |- ! 1 (Read Coils) и 2 (Read Discrete Inputs) |<ul><li>Address of the first flag reg…»
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Новая страница: «The following table shows the query and response data structures for the main Modbus functions.»
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Новая страница: «We have received a hexadecimal number 0x2D as data, so the state of eight coil registers in binary form is: 0b10110100.»
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Новая страница: «Let's take a closer look at how data is exchanged between the client device sending the request and the server device responding to it. The following figure shows…»
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Новая страница: «=== Modbus request and response data format ===»
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Новая страница: «Commands can be divided by types: reading values of record values; operation with a single — value operation on multiple values.»
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Новая страница: «{|class="wikitable" align="center" !Function code || HEX || Name |- ! 1 | 0x01 || Read Coils |- ! 2 | 0x02 ||Read Discrete Inputs |- ! 3…»
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Новая страница: «The following table shows the most common Modbus function codes:»
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Новая страница: «=== Register reading and writing function codes ===»
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Новая страница: «700px|thumb|center|Template Fragment for SDM220 meter»
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Новая страница: «The manufacturer provides both logical and physical addresses of the registers in the table, which allows us to easily create a device template and illustrate the…»
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Новая страница: «The ready-made device templates of the Wiren Board 5 controller have a template for a single-phase electricity meter SDM220 (/usr/share/wb-mqtt-serial/templates/c…»
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Новая страница: «Sometimes the description of a device shall contain only logical addresses. For example, coil register 0 has the address 000001, input register 4 — 400005, etc.»
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Новая страница: «This misleads how to access the register with the desired number. Moreover, the terms "address" and "register" can be used by the manufacturer arbitrarily. Most o…»
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Новая страница: «{|class="wikitable" align="center" ! Table || Table number || Initial logical address || Register number (physical address) || Logical address range |- ! Coils |…»
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Новая страница: «In the Modbus standard for each of the four types of registers are used in different tables with the numbers 0,1,3,4. Thus, a register of a certain type with a ce…»
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Новая страница: «===Registers addresses and numbers===»
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Новая страница: «Holding Registers and Input Registers are represented by a two-byte word and can store values from 0 to 65535 (0x0000 — 0xFFFFF). Input registers are read-only…»
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Новая страница: «Discrete inputs are also single-bit registers that describe the state of the device input (for example, voltage — 1). These registers are read-only.»
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Новая страница: «Coils store single-bit values - they can be in the 0 or 1 state. These registers can indicate the current state of the output (whether the relay is off or on). T…»
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Новая страница: «Data exchange with Modbus devices takes place via registers. The Modbus Protocol defines four types of registers shown in the table: {|class="wikitable" align="ce…»
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Новая страница: «===Modbus data model===»
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Новая страница: «In Modbus it is customary to encode addresses and data in the big-endian format, when bytes are starting with the high: for example, when transmitting the hexade…»
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Новая страница: «===Modbus data structures===»
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Новая страница: «---- It is necessary to determine the timeout waiting for a response from the slave — it is pointless to wait a long time for an answer, which, perhaps, due to…»
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Новая страница: «700px|thumb|center|Modbus-transaction with errors»
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Новая страница: «If an error occurs, the device returns an error code. In the case of a normal transaction, the function code in the response is returned unchanged; in the case of…»
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Новая страница: «700px|thumb|center|Modbus-transaction without errors»
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Новая страница: «The function is encoded in one byte and determines what action the server device should perform. Function codes range from 1 to 255, with codes 128 to 255 reserve…»
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Новая страница: «The Modbus data package looks as shown in the figure. A PDU (Protocol Data Unit) is a common part of a MODBUS package that includes the function code and data of…»
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Новая страница: «900px|thumb|left|Modbus datagram in general»
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Новая страница: «The master device periodically polls the slave or server. The master has no address, the transmission of messages from the device server to the host without askin…»
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Новая страница: « There are two protocol specifications: Modbus RTU and Modbus ASCII. An 11-bit character consisting of 1 start bit, 8 data bits (starting with the lower bit), a p…»
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