uuid::modbus Namespace Reference

Asynchronous Modbus library. More...

Classes
class	ExceptionStatusResponse
	Exception status response message. More...
class	RegisterDataResponse
	Register data response message. More...
class	RegisterRequest
	Request message for register functions. More...
class	RegisterWriteResponse
	Register write response message. More...
class	Request
	Request message. More...
class	Response
	Response message. More...
class	SerialClient
	Serial client used to process requests. More...

Typedefs
using	frame_buffer_t = std::array< uint8_t, MAX_MESSAGE_SIZE+1 >

Enumerations
enum	DeviceAddressType : uint8_t { BROADCAST = 0, MIN_UNICAST = 1, MAX_UNICAST = 247 }
	Device address types. More...
enum	FunctionCode : uint8_t { READ_HOLDING_REGISTERS = 0x03, READ_INPUT_REGISTERS = 0x04, WRITE_SINGLE_REGISTER = 0x06, READ_EXCEPTION_STATUS = 0x07 }
	Function codes. More...
enum	ResponseStatus : uint8_t {   QUEUED, TRANSMIT, WAITING, SUCCESS,   EXCEPTION, FAILURE_INVALID, FAILURE_CRC, FAILURE_TIMEOUT,   FAILURE_TOO_SHORT, FAILURE_TOO_LONG, FAILURE_ADDRESS, FAILURE_FUNCTION,   FAILURE_LENGTH, FAILURE_UNEXPECTED }
	Status of response messages. More...

Variables
const uuid::log::Logger	logger {reinterpret_cast<const __FlashStringHelper *>(__pstr__loggername), uuid::log::Facility::DAEMON}
constexpr uint16_t	MAX_MESSAGE_SIZE = 256
constexpr uint16_t	MESSAGE_HEADER_SIZE = 2
constexpr uint16_t	MESSAGE_CRC_SIZE = 2
constexpr uint32_t	INTER_FRAME_TIMEOUT_MS = 5
	Timeout between frames (in milliseconds). More...
constexpr uint16_t	DEFAULT_UNICAST_TIMEOUT_MS = 10000
constexpr uint16_t	DEFAULT_BROADCAST_TIMEOUT_MS = 1000

Detailed Description

Asynchronous Modbus library.

Provides a client for communication using the Modbus protocol. This library is for single threaded applications and cannot be used from an interrupt context.

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Typedef Documentation

frame_buffer_t

using uuid::modbus::frame_buffer_t = typedef std::array<uint8_t, MAX_MESSAGE_SIZE + 1>

Buffer for receiving frames.

Since

0.1.0

Definition at line 67 of file modbus.h.

Enumeration Type Documentation

DeviceAddressType

enum uuid::modbus::DeviceAddressType : uint8_t

Device address types.

All other values are reserved.

Since

0.1.0

Enumerator
BROADCAST	Broadcast device address. Since 0.1.0
MIN_UNICAST	Minimum device address. Since 0.1.0
MAX_UNICAST	Maximum device address. Since 0.1.0

Definition at line 76 of file modbus.h.

FunctionCode

enum uuid::modbus::FunctionCode : uint8_t

Function codes.

Since

0.1.0

Enumerator
READ_HOLDING_REGISTERS	Read holding registers. Since 0.1.0
READ_INPUT_REGISTERS	Read input registers. Since 0.1.0
WRITE_SINGLE_REGISTER	Write single register. Since 0.1.0
READ_EXCEPTION_STATUS	Read exception status. Since 0.1.0

Definition at line 87 of file modbus.h.

ResponseStatus

enum uuid::modbus::ResponseStatus : uint8_t

Status of response messages.

Since

0.1.0

Enumerator
QUEUED	Waiting in queue. Since 0.1.0
TRANSMIT	Request being transmitted. Since 0.1.0
WAITING	Waiting for response. Since 0.1.0
SUCCESS	Response received. Since 0.1.0
EXCEPTION	Exception response received. Since 0.1.0
FAILURE_INVALID	Invalid request parameters. Since 0.1.0
FAILURE_CRC	Invalid CRC in response. Since 0.1.0
FAILURE_TIMEOUT	Request timed out. Since 0.1.0
FAILURE_TOO_SHORT	Response too short. Since 0.1.0
FAILURE_TOO_LONG	Response too long. Since 0.1.0
FAILURE_ADDRESS	Response from another device. Since 0.1.0
FAILURE_FUNCTION	Unexpected function code in response. Since 0.1.0
FAILURE_LENGTH	Incorrect response length. Since 0.1.0
FAILURE_UNEXPECTED	Received a response to broadcast request. Since 0.1.0

Definition at line 99 of file modbus.h.

Variable Documentation

DEFAULT_BROADCAST_TIMEOUT_MS

constexpr uint16_t uuid::modbus::DEFAULT_BROADCAST_TIMEOUT_MS = 1000

constexpr

Default time to wait after a broadcast request (in milliseconds).

Since

0.2.0

Definition at line 63 of file modbus.h.

DEFAULT_UNICAST_TIMEOUT_MS

constexpr uint16_t uuid::modbus::DEFAULT_UNICAST_TIMEOUT_MS = 10000

constexpr

Default time to wait for a unicast response (in milliseconds).

Since

0.2.0

Definition at line 62 of file modbus.h.

INTER_FRAME_TIMEOUT_MS

constexpr uint32_t uuid::modbus::INTER_FRAME_TIMEOUT_MS = 5

constexpr

Timeout between frames (in milliseconds).

9600 bps: 4ms 19200 bps: 2ms Minimum: 1.75ms

Allow an extra 1ms to compensate for timing at 1ms precision.

Since

0.1.0

Definition at line 61 of file modbus.h.

logger

const uuid::log::Logger uuid::modbus::logger {reinterpret_cast<const __FlashStringHelper *>(__pstr__loggername), uuid::log::Facility::DAEMON}

uuid::log::Logger instance for Modbus library.

Since

0.1.0

Definition at line 37 of file modbus.cpp.

MAX_MESSAGE_SIZE

constexpr uint16_t uuid::modbus::MAX_MESSAGE_SIZE = 256

constexpr

Maximum size of a message.

Since

0.1.0

Definition at line 47 of file modbus.h.

MESSAGE_CRC_SIZE

constexpr uint16_t uuid::modbus::MESSAGE_CRC_SIZE = 2

constexpr

Size of message CRC.

Since

0.1.2

Definition at line 49 of file modbus.h.

MESSAGE_HEADER_SIZE

constexpr uint16_t uuid::modbus::MESSAGE_HEADER_SIZE = 2

constexpr

Size of message header (device address and function code).

Since

0.1.2

Definition at line 48 of file modbus.h.