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- modbus_read_bits(3)
- ===================
- 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
- --------
- linkmb:modbus_write_bit[3]
- linkmb:modbus_write_bits[3]
- AUTHORS
- -------
- The libmodbus documentation was written by Stéphane Raimbault
- <stephane.raimbault@gmail.com>
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