'\" t
.\"     Title: modbus_read_input_bits
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
.\"      Date: 05/26/2012
.\"    Manual: Libmodbus Manual
.\"    Source: libmodbus 3.0.3
.\"  Language: English
.\"
.TH "MODBUS_READ_INPUT_BI" "3" "05/26/2012" "libmodbus 3\&.0\&.3" "Libmodbus Manual"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
modbus_read_input_bits \- read many input bits
.SH "SYNOPSIS"
.sp
\fBint modbus_read_input_bits(modbus_t *\fR\fB\fIctx\fR\fR\fB, int \fR\fB\fIaddr\fR\fR\fB, int \fR\fB\fInb\fR\fR\fB, uint8_t *\fR\fB\fIdest\fR\fR\fB);\fR
.SH "DESCRIPTION"
.sp
The \fImodbus_read_input_bits()\fR function shall read the content of the \fInb\fR input bits to the address \fIaddr\fR of the remote device\&. The result of reading is stored in \fIdest\fR array as unsigned bytes (8 bits) set to \fITRUE\fR or \fIFALSE\fR\&.
.sp
You must take care to allocate enough memory to store the results in \fIdest\fR (at least \fInb\fR * sizeof(uint8_t))\&.
.sp
The function uses the Modbus function code 0x02 (read input status)\&.
.SH "RETURN VALUE"
.sp
The \fImodbus_read_input_status()\fR function shall return the number of read input status if successful\&. Otherwise it shall return \-1 and set errno\&.
.SH "ERRORS"
.PP
EMBMDATA
.RS 4
Too many discrete inputs requested
.RE
.SH "SEE ALSO"
.sp
\fBmodbus_read_input_registers\fR(3)
.SH "AUTHORS"
.sp
The libmodbus documentation was written by St\('ephane Raimbault <\m[blue]\fBstephane\&.raimbault@gmail\&.com\fR\m[]\&\s-2\u[1]\d\s+2>
.SH "NOTES"
.IP " 1." 4
stephane.raimbault@gmail.com
.RS 4
\%mailto:stephane.raimbault@gmail.com
.RE