NAME

       modbus_write_and_read_registers - write and read many registers in a single transaction

SYNOPSIS

       int modbus_write_and_read_registers(modbus_t *ctx, int write_addr, int write_nb, const uint16_t *src, int
       read_addr, int read_nb, const uint16_t *dest);

DESCRIPTION

       The modbus_write_and_read_registers() function shall write the content of the write_nb holding registers
       from the array src to the address write_addr of the remote device then shall read the content of the
       read_nb holding registers to the address read_addr of the remote device. The result of reading is stored
       in dest array as word values (16 bits).

       You must take care to allocate enough memory to store the results in dest (at least nb *
       sizeof(uint16_t)).

       The function uses the Modbus function code 0x17 (write/read registers).

RETURN VALUE

       The function shall return the number of read registers if successful. Otherwise it shall return -1 and
       set errno.

ERRORS

       EMBMDATA
           Too many registers requested, Too many registers to write

SEE ALSO

       modbus_read_registers(3) modbus_write_register(3) modbus_write_registers(3)

AUTHORS

       The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>