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Man Pages
MODBUS_WRITE_BITS(3) libmodbus Manual MODBUS_WRITE_BITS(3)

modbus_write_bits - write many bits

int modbus_write_bits(modbus_t *ctx, int addr , int nb, const uint8_t *src);

The modbus_write_bits() function shall write the status of the nb bits (coils) from src at the address addr of the remote device. The src array must contains bytes set to TRUE or FALSE.
The function uses the Modbus function code 0x0F (force multiple coils).

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

EMBMDATA
Writing too many bits

modbus_read_bits(3) modbus_write_bit(3)

The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>
12/20/2018 libmodbus v3.1.4

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