Data transmission using MODBUS Protocol. Serial Communications and via TCP/IP. MODBUS RTU ASCII Modus. Functions list.

SuperCom MODBUS Library: Provides a portable API for Windows, Linux (x86, x64, ARM32, ARM64), and Raspberry Pi. It supports both master and slave functionality over serial (RS-232/485) and TCP/IP, with samples available in C, C++, C#, Visual Basic, Java, Pascal, Delphi.

A Modbus API (RTU, TCP, ASCII) for Windows, Linux and RaspBerry Pi.

Cross library Modbus RTU, TCP, ASCII for ARM (ARM32 and ARM64 CPU, AArch64).

Portable Modbus Library to execute under Windows, Linux, Raspberry Pi (ARM32 and ARM64 CPU AArch64).

Use with C, C++, C#, Delphi, Java, Visual Basic VB Net, etc.

Modbus client and slave in Raspberry pi, Modbus in C/C++, C#.

Modbus library for c++ ARM AArch64.

Some SuperCom - MODBUS Functions

The SuperCom MODBUS Protocol Module implements the MODBUS protocol. It also supports custom function codes and data packets by implementing functions that communicate transparently.

A MODBUS client or server, created with the required SuperCom software, can control different type of connections. More...

RS_MBGetConfig	Retrieve the protocol module configuration
RS_MBSetConfig	Change the protocol module configuration
RS_MBSetConfigStr*	Change the protocol module configuration. The difference to RS_MBSetConfig is: the values are stored in a string as "Name=Value;" pairs.
RS_MBReadCoil	Read values of a single coils
RS_MBReadCoils	Read the values of a sequence of coils
RS_MBReadCoilsStr*	Read the values of a sequence of coils and returns the coil values as a string, e.g. "01100100"
RS_MBReadInput	Read the values (bits) of one or more discrete Input bits
RS_MBReadInputRegisters	Read a sequence of Input Registers
RS_MBReadHoldingRegisters	Read a sequence of Holding Registers
RS_MBReadGeneralReference	Can read multiple groups & references
RS_MBWriteCoil	Set the value of a single coil
RS_MBWriteCoils	Set the value of a sequence of coil
RS_MBWriteCoilsStr*	Set the value of a sequence of coil. The difference to RS_MBWriteCoils is: the new coil values are provided as a string, e.g. "01100100"
RS_MBWriteRegister	Set the value of a single register
RS_MBWriteRegisters	Set the value of a sequence of registers
RS_MBWriteReadRegisters	Changes the value of some registers and reads the value of some registers
RS_MBHandleRequests	Handle Master requests - Simulate a MODBUS Server. This function is almost all that is necessary with the SuperCom software to create a server, that can even control multiple connections simultaneously (e.g. under TCP/IP). Specific samples are included.
RS_MBSetPLCMem	Defines and populates a memory area in order to simulate a PLC (simulation of a MODBUS Server). It can also be used to get a snapshot of the simulated PLC's memory.
RS_MBReadFIFOQueue	Read First-In-First-Out (FIFO) queue of holding registers. The function returns the count and the value of the registers in the queue.
RS_MBGetDeviceId	Read Device Identification and other device related information (e.g. vendor name, product code, version, revision number). It is using function code 43 (Hex 2B) and MEI Type 14 (Hex 0E).
RS_MBGetEventCounter	Provides a status word and an event count from the Modbus server's plc.
RS_MBGetEventLog	Provides a status word, an event count, a message count and event bytes from the Modbus server's plc.
RS_RXMODBUS	Receive a data packet according to the MODBUS protocol specification. Data packets received are handed over transparently. Using this function it is possible to receive custom requests (custom function codes e.g. FC43), build a MODBUS Server, a MODBUS to "other protocol" converter or gateway, etc.
RS_TXMODBUS	Transmit a data packet according to the MODBUS protocol specification. Using this function it is possible to transmit data packets transparently e.g. respond or transmit a custom requests (custom function codes e.g. FC43), support custom function codes, build a MODBUS Server, a MODBUS to "other protocol" converter or MODBUS Gateway (e.g. Serial to Ethernet), etc.
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With the SuperCom MODBUS Protocol Module there is only one API to learn! The same functions and parameters used with serial, TCP/IP or ISDN type of connections.