modbus_read_input_registers(3) ============================== 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 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 -------- linkmb:modbus_read_input_bits[3] linkmb:modbus_write_register[3] linkmb:modbus_write_registers[3] AUTHORS ------- The libmodbus documentation was written by Stéphane Raimbault