FieldTalk^™ Modbus^® Slave Library
C++ Editions

MODBUS/TCP Protocol

Detailed Description

The Server Engine of the MODBUS/TCP slave protocol is implemented in the class MbusTcpSlaveProtocol.

It provides functions to start-up and to execute the server engine. This server engine can handle multiple master connections and is implemented as a single threaded TCP server. Upon receipt of a valid master query the server engine calls Data Provider methods to exchange data with the user application. For a more detailed description which Modbus data and control functions have been implemented in the server engine see section Server Functions common to all Protocol Flavours.

Note:: If the configured TCP port is below IPPORT_RESERVED (usually 1024), the process has to run with root privilege! This applies if you are using the default MODBUS/TCP port 502.

See section The MODBUS/TCP Protocol for some background information about MODBUS/TCP.

See section Using MODBUS/TCP Protocol for an example how to use the MbusTcpSlaveProtocol class.


Classes
class	MbusTcpSlaveProtocol
	MODBUS/TCP Slave Protocol class. More...
Defines
#define	MAX_CONNECTIONS 16
	Maximum concurrent TCP/IP connections handled by server engine.

MODBUS/TCP Protocol

Detailed Description

Classes

Defines