modbus_connect

Name

modbus_connect - establish a Modbus connection

Synopsis
    int modbus_connect(modbus_t *ctx);

Description

The modbus_connect() function shall establish a connection to a Modbus server, a network or a bus using the context information of libmodbus context given in argument.

Return value

The function shall return 0 if successful. Otherwise it shall return -1 and set errno to one of the values defined by the system calls of the underlying platform.

Example
    modbus_t *ctx;
    ctx = modbus_new_tcp("127.0.0.1", 502);
    if (modbus_connect(ctx) == -1) {
        fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
        modbus_free(ctx);
        return -1;
    }

See also

    •   modbus_close ⟨modbus_close.md⟩