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Old August 12th, 2008, 01:40 AM   #6
yasser sayeed

yasser sayeed is offline
Join Date: Aug 2008
Location: maharashtra
Posts: 4
One SIMATIC S7-200 CPU 212, CPU 214, CPU 215, OR CPU 216

// One PC/PPI cable
// One converter, 9-pin female to 25-pin male
// One converter, serial-to-parallel
// One null modem adapter for swapping lines 2 and 3 (if required)
// One parallel printer
// ***NOTE:***
// One problem might occur. Because the SIMATIC S7-200 and the printer
// both behave as slaves (data communications equipment, or DCE), the
// data transfer of each device tries to run in the same direction.
// This means that both the receive and transmit data lines end up
// connected to each other (lines 2 and 3). You can avoid this problem
// by setting up the converter properly or by using an appropriate
// wiring adapter (a null modem adapter).
// These SIMATIC S7-200 Application Tips are provided free of charge
// to give users of the S7-200 examples of programming techniques
// available to accomplish certain tasks in various applications.
// These Tips do not purport to cover all details or variations in
// equipment, nor do they provide for every possible contingency.
// Your application may be different from those contemplated herein.
// It is your responsibility to use the SIMATIC S7-200 properly in
// your application. These Tips do not relieve you of the responsibility
// to use sound practices in application, installation, operation
// and maintenance. By using these Tips, you acknowledge that Siemens
// shall not be liable under any theory for damages or personal
// injury resulting from such use.
// Siemens reserves the right to make changes in these Tips at any
// time without notice or obligation. Should a conflict arise between
// the suggestions in these Tips and other Siemens publications such
// as the S7-200 Programmable Controller System Manual or the
// SIMATIC S7 / M7 / C7 Programmable Controllers Catalog ST 70, the
// other publication shall take precedence.
// Copyrightę 1999 Siemens Energy & Automation, Inc. Any form
// of duplication or distribution of these Tips or excerpts hereof
// is prohibited without the express consent of Siemens Energy &
// Automation, Inc.
// ***ONLINE HELP***
// To activate the associated online Help file, open the directory
// on your desktop where you stored these files or select the
// documentation CD and double-click on the 200TIPSB.hlp file. After
// the Help file starts, use the Table of Contents or the Help Topics
// Index to select the file associated with this tip.
// ***OVERVIEW***
// This example demonstrates how to connect an S7-200 CPU to a printer
// and send information to the printer by using the Freeport
// communication mode of the CPU. You can use Freeport mode to transmit
// data and to receive data.
// You can use the Freeport mode to define your communication protocol.
// You select the Freeport protocol in special memory byte SMB30 (for
// Port 0 of your S7-200 CPU) or SMB130 (for Port 1 of your S7-200 CPU,
// if your CPU has two ports). You also store the information needed
// for communication in one of these special memory bytes. After selecting
// the Freeport mode, you declare the following:
// Baud rate
// Number of data bits per character
// Parity
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