NAME

       modbus_read_input_registers - read many input registers

SYNOPSIS

       int modbus_read_input_registers(modbus_t *ctx, int addr, int nb, uint16_t *dest);

DESCRIPTION

       The modbus_read_input_registers() function shall read the content of the nb input
       registers to address addr of the remote device. The result of the 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 0x04 (read input registers). The holding
       registers and input registers have different historical meaning, but nowadays it’s more
       common to use holding registers only.

RETURN VALUE

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

ERRORS

       EMBMDATA
           Too many bits requested

SEE ALSO

       modbus_read_input_bits(3) modbus_write_register(3) modbus_write_registers(3)

AUTHORS

       The libmodbus documentation was written by Stéphane Raimbault
       <stephane.raimbault@gmail.com[1]>

NOTES

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