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'\"
'\" Copyright (c) 1993 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\" Copyright (c) 2018 Christian Werner <chw at ch minus werner dot de>
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
.TH snap7 n 8.6 Tcl "Tcl Extension Commands"
.\" ---- man.macros begin ----
.\" The -*- nroff -*- definitions below are for supplemental macros used
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.\}
.el \}\
\h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
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.LP
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.LP
See the \\*(So manual entry for details on the standard options.
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Command-Line Name:	\\fB\\$1\\fR
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Database Class:	\\fB\\$3\\fR
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.\" ---- man.macros end ----
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
snap7 \- Tcl interface to the Snap7 library
.SH SYNOPSIS
package require \fBTcl 8.6\fR
.sp
package require \fBsnap7\fR
.sp
\fBsnap7::new\fR \fIcmd\fR
.sp
\fIcmd\fR \fBdestroy\fR
.sp
\fIcmd\fR \fBconnect\fR \fIaddr port rack slot\fR
.sp
\fIcmd\fR \fBdisconnect\fR
.sp
\fIcmd\fR \fBconntype\fR \fItype\fR
.sp
\fIcmd\fR \fBparam\fR ?\fIname\fR? ?\fIvalue\fR?
.sp
\fIcmd\fR \fBisconnected\fR
.sp
\fIcmd\fR \fBpdulength\fR
.sp
\fIcmd\fR \fBdbread\fR \fIdb start count\fR
.sp
\fIcmd\fR \fBdbreada\fR \fIdb start count\fR
.sp
\fIcmd\fR \fBdbwrite\fR \fIdb start data ...\fR
.sp
\fIcmd\fR \fBdbwritea\fR \fIdb start bytes\fR
.sp
.BE
.SH DESCRIPTION
This package provides a Tcl interface to the Snap7 library (see
http://snap7.sourceforge.net) using Ffidl and TclOO.
.SH COMMANDS
.TP
\fBsnap7::new\fR \fIcmd\fR
Creates a new command \fIcmd\fR which implements a Snap7 connection
object. Further operations on that object are carried out by invoking
methods on \fIcmd\fR.
.TP
\fIcmd\fR \fBdestroy\fR
Destroys the connection object \fIcmd\fR, releases resources and closes
communications links.
.TP
\fIcmd\fR \fBconnect\fR \fIaddr port rack slot\fR
Connects the connection object \fIcmd\fR to its peer using the IP
address \fIaddr\fR, the TCP port number \fIport\fR and further
address information (\fIrack\fR and \fIslot\fR numbers).
.TP
\fIcmd\fR \fBdisconnect\fR
Closes the connection of the connection object \fIcmd\fR.
.TP
\fIcmd\fR \fBconntype\fR \fItype\fR
Sets the connection type of the connection object \fIcmd\fR. Must be called
before a connection is made using the \fBconnect\fR method. Valid values
for \fItype\fR are 1 (PG), 2 (OP), and 3 (basic).
.TP
\fIcmd\fR \fBparam\fR ?\fIname\fR? ?\fIvalue\fR?
If invoked without arguments, returns a list of parameter names which
can be queried or set on the connection object \fIcmd\fR. If \fIname\fR
is provided, a query of this named parameter is performed. If both,
\fIname\fR and \fIvalue\fR are provided, the named parameter is set
to the value given.
.TP
\fIcmd\fR \fBisconnected\fR
Returns true or false depending on connection state of the
connection object \fIcmd\fR.
.TP
\fIcmd\fR \fBpdulength\fR
Returns a two element list made up of requested and negotiated PDU
length of the connection object \fIcmd\fR.
.TP
\fIcmd\fR \fBdbread\fR \fIdb start count\fR
Reads \fIcount\fR bytes beginning at \fIstart\fR from the data block
\fIdb\fR using the connection object \fIcmd\fR. Data is returned
as a list of integer numbers.
.TP
\fIcmd\fR \fBdbreada\fR \fIdb start count\fR
Reads \fIcount\fR bytes beginning at \fIstart\fR from the data block
\fIdb\fR using the connection object \fIcmd\fR. Data is returned
as a byte array.
.TP
\fIcmd\fR \fBdbwrite\fR \fIdb start data ...\fR
Writes the numbers specified by \fIdata\fR and following arguments
as bytes beginning at \fIstart\fR into the data block \fIdb\fR using
the connection object \fIcmd\fR.
.TP
\fIcmd\fR \fBdbwritea\fR \fIdb start bytes\fR
Writes the byte array \fIbytes\fR beginning at \fIstart\fR into the
data block \fIdb\fR using the connection object \fIcmd\fR.
.SH KEYWORDS
Ffidl, PLC, S7
.SH COPYRIGHT
.nf
Copyright (c) 2018 chw at ch minus werner dot de
.fi