MODBUS_READ_INPUT_RE(3) Libmodbus Manual MODBUS_READ_INPUT_RE(3)NAMEmodbus_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 ALSOmodbus_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
libmodbus 3.1.0 10/06/2013 MODBUS_READ_INPUT_RE(3)
