debian man page for modbus_write_and_read_registers

MODBUS_WRITE_AND_REA(3) 					 Libmodbus Manual					   MODBUS_WRITE_AND_REA(3)

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 modbus_write_and_read_registers() 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 Stephane Raimbault <stephane.raimbault@gmail.com[1]>

NOTES
	1. stephane.raimbault@gmail.com
	   mailto:stephane.raimbault@gmail.com

libmodbus 3.0.3 						    05/26/2012						   MODBUS_WRITE_AND_REA(3)