'\" t
.\"     Title: modbus_connect
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 10/18/2014
.\"    Manual: Libmodbus Manual
.\"    Source: libmodbus 3.0.6
.\"  Language: English
.\"
.TH "MODBUS_CONNECT" "3" "10/18/2014" "libmodbus 3\&.0\&.6" "Libmodbus Manual"
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.SH "NAME"
modbus_connect \- establish a Modbus connection
.SH "SYNOPSIS"
.sp
\fBint modbus_connect(modbus_t *\fR\fB\fIctx\fR\fR\fB);\fR
.SH "DESCRIPTION"
.sp
The \fImodbus_connect()\fR function shall etablish a connection to a Modbus server, a network or a bus using the context information of libmodbus context given in argument\&.
.SH "RETURN VALUE"
.sp
The modbus_connect() function shall return 0 if successful\&. Otherwise it shall return \-1 and set errno to one of the values defined by the system calls of the underlying platform\&.
.SH "EXAMPLE"
.sp
.if n \{\
.RS 4
.\}
.nf
modbus_t *ctx;

ctx = modbus_new_tcp("127\&.0\&.0\&.1", 502);
if (modbus_connect(ctx) == \-1) {
    fprintf(stderr, "Connection failed: %s\en", modbus_strerror(errno));
    modbus_free(ctx);
    return \-1;
}
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.sp
\fBmodbus_close\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