barcode reader asp.net web application SERIAL I/O in Software

Draw QR in Software SERIAL I/O

SERIAL I/O
Scan Denso QR Bar Code In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
QR-Code Drawer In None
Using Barcode drawer for Software Control to generate, create QR Code JIS X 0510 image in Software applications.
16F84
QR Code 2d Barcode Decoder In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Generate QR Code In C#.NET
Using Barcode maker for Visual Studio .NET Control to generate, create QR-Code image in .NET framework applications.
DS275
Denso QR Bar Code Drawer In .NET
Using Barcode encoder for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
Painting QR-Code In .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create Quick Response Code image in Visual Studio .NET applications.
Vcc Vdrv 9 10 1 Tin 3 Rout 8 2
QR Code Creator In VB.NET
Using Barcode drawer for .NET framework Control to generate, create QR Code 2d barcode image in .NET framework applications.
Barcode Creator In None
Using Barcode maker for Software Control to generate, create bar code image in Software applications.
0.1 uF Tantalum Gnd
Code128 Creator In None
Using Barcode encoder for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
UPC - 13 Printer In None
Using Barcode generation for Software Control to generate, create EAN-13 Supplement 5 image in Software applications.
10 K
Data Matrix ECC200 Drawer In None
Using Barcode creation for Software Control to generate, create ECC200 image in Software applications.
EAN / UCC - 13 Creator In None
Using Barcode maker for Software Control to generate, create UCC - 12 image in Software applications.
RB3 RB4
Making OneCode In None
Using Barcode creator for Software Control to generate, create OneCode image in Software applications.
Code-128 Generator In Java
Using Barcode encoder for Java Control to generate, create Code 128 Code Set A image in Java applications.
4 15
Barcode Generator In VS .NET
Using Barcode creator for Reporting Service Control to generate, create bar code image in Reporting Service applications.
Printing EAN / UCC - 14 In None
Using Barcode encoder for Online Control to generate, create EAN / UCC - 13 image in Online applications.
_MCLR Osc 1
Make UPC-A Supplement 2 In Java
Using Barcode generation for Android Control to generate, create UPC-A Supplement 2 image in Android applications.
Bar Code Scanner In VS .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
4 Gnd
Make Barcode In VS .NET
Using Barcode generation for Reporting Service Control to generate, create bar code image in Reporting Service applications.
Make Barcode In Java
Using Barcode generator for Java Control to generate, create bar code image in Java applications.
4MHz
5 Tout 7 Rin
Osc 2 Vss
Female 9-Pin D-Shell
Figure 20.32 Circuit used to demonstrate simple RS-232 communications with the PIC microcontroller.
New Year s Eve 1999 so that I could save the current manuscript on CD-ROM to make sure that I would avoid any Y2K problems without losing anything, and I was starting to get ready to move. This resulted in a lot of pandemonium and three problems with getting the application running. Later in this chapter I am going to discuss debugging an application, but there are a few things that I learned that you should remember when you are in a stressful situation and you feel like you just have to get things done. The rst thing is to keep your perspective. The critical aspect of getting the manuscript onto CD-ROM was just that I should not feel like my back is up against a wall because something isn t nished. What I should have done is made a CD-ROM of the current manuscript and then, when things calmed down, look at the problem again. CD-ROMs cost
+5 Volt P/S
10 K
Breadboard wiring for BasicRS experiment.
0.1 uF
PIC1F84
4 MHz
DS275
PIC MICROCONTROLLER APPLICATION BASICS
TABLE 20.15 BILL OF MATERIALS FOR THE BasicRS EXPERIMENT PART DESCRIPTION
PIC 0.1- F 10k 4-MHz DS275 Female 9-pin D-shell Misc.
PIC16F84 04/P 0.1- F tantalum 10 k , 1/4 W 4 MHz with built-in capacitors DS275 9-Pin DIP RS-232 Interface DB-9F Female 9-pin, D-shell connector Breadboard, wiring, +5-V power supply
less than 50 cents; if I were able to get the application running before Y2K and written up, I only would have wasted a couple of quarters. When I was able to realize that the important thing was to make sure that I would be ready for the deadline and not have my back against the wall, my blood pressure went down a lot, and I was able to nd and x the problems. As I have said, I have implemented this bit banging algorithm on a number of different systems, but it turned out that I had not done any with the DS275. This caused me some trouble trying to gure out exactly what the problem was, and it was compounded by my not waiting a full stop bit s width before sending data back to the PC. This was a problem in that the PC s UART could not interpret the data coming back and simply ignored the characters. Because I was using HyperTerminal with it, the errors were not reported back to me. I was able to nd the issue with the stop bit with an oscilloscope. When I was able to see that the stop bit of the data going back to the PC was only 520 s long (it should be at least 833 s for 1,200 bps), I was able to go back to the code and x the problem. Next, I discovered that after I sent the rst character, data would be sent repeatedly. This is so because of the negative voltage stealing of the DS275. The problem was that as data was being transmitted, it also was being received and resent over and over again in a digital feedback loop. Normally, as I said, when have I implemented this algorithm in a PIC microcontroller in the past, it was always with a MAX232, so the feedback angle wasn t possible. To x this problem, I stopped polling the incoming data while a byte transmit was taking place. Lastly, I discovered that I miswired the DS275. Instead of connecting the Vcc pin (8) to my breadboard Vcc, I accidentally connected it to ground. I found this when I was trying to gure out the other problems, and I discovered that the voltage level was very low (and not between 0 and 5 V, as I expected from my previous experiences with the DS275). This was the keystone to all the problems, and when this was xed, everything fell into place. The problem was calming down enough to go back and check every connection against the wiring diagram I produced for it (Fig. 20.33). Once I did this, I was able to
Copyright © OnBarcode.com . All rights reserved.