NAME

       modbus_read_bits - read many bits

SYNOPSIS

       int modbus_read_bits(modbus_t *ctx, int addr, int nb, uint8_t *dest);

DESCRIPTION

       The modbus_read_bits() function shall read the status of the nb bits (coils) to the
       address addr of the remote device. The result of reading is stored in dest array as
       unsigned bytes (8 bits) set to TRUE or FALSE.

       You must take care to allocate enough memory to store the results in dest (at least nb *
       sizeof(uint8_t)).

       The function uses the Modbus function code 0x01 (read coil status).

RETURN VALUE

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

ERRORS

       EMBMDATA
           Too many bits requested

SEE ALSO

       modbus_write_bit(3) modbus_write_bits(3)

AUTHORS

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