473,847 Members | 1,714 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Sending chr(255) to serial port

...
Hi

I need to send a chr(255) to a serial port. When I send it, through
comm.write (chr(255)) it sends a chr(63) ... in Hex, I write chr(&FF) and it
actually sends chr(&3F) ... why does this happen, and how can I send it
right ?

I'm using vb.net 2005 express with framework 2.0

Thanks for an answear ...

Mike
Jul 31 '06 #1
3 3692
.... wrote:
I need to send a chr(255) to a serial port. When I send it, through
comm.write (chr(255)) it sends a chr(63) ... in Hex, I write chr(&FF) and it
actually sends chr(&3F) ... why does this happen, and how can I send it
right ?
How are you verifiying what is being sent? Can you show some code you
are using that demonstrates the problem? What encoding are you using?

Jul 31 '06 #2
See my reply in the .dotnet.general newsgroup.

--
Richard Grier, MVP
Hard & Software
Author of Visual Basic Programmer's Guide to Serial Communications, Fourth
Edition,
ISBN 1-890422-28-2 (391 pages, includes CD-ROM). July 2004, Revised March
2006.
See www.hardandsoftware.net for details and contact information.
Jul 31 '06 #3
...
Hi Chris

I'm using "Classic" writing to the port ... something like

Comm.write (chr(255) + chr(30) + ...)

I installed a Comm Spy program to capture everything that flows across the
serial port. The machine doesn't work as it was supposed, so I decided to
"listen" to the stream and noticed that.

I'm not using any encoding. I supposed there was no need for it ... :|

Thanx

Mike
-----------------------

"Chris Dunaway" <du******@gmail .comescreveu na mensagem
news:11******** **************@ i42g2000cwa.goo glegroups.com.. .
... wrote:
>I need to send a chr(255) to a serial port. When I send it, through
comm.write (chr(255)) it sends a chr(63) ... in Hex, I write chr(&FF) and
it
actually sends chr(&3F) ... why does this happen, and how can I send it
right ?

How are you verifiying what is being sent? Can you show some code you
are using that demonstrates the problem? What encoding are you using?

Jul 31 '06 #4

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

3
11362
by: Sells, Fred | last post by:
I'm using MSW XP Pro with Python 2.4 to develop but production will be Linux with Python 2.3. (could upgrade to 2.4 if absolutely necessary) I can also switch to Linux for development if necessary. I am writing some python to replace proprietary software that talks to a timeclock via UDP. The timeclock extracts the sending port from the UDP header and uses that for all response messages.
12
2135
by: ken | last post by:
Hello everyone, I'm new to visual VB and I am trying to setup communications to the outside world. I found the example listed below in the help section of Microsoft Visual Basic 2005 Express Edition. Using the Hyper Terminal should I be able to see the string "Hello" or am I completely off base here? Thank you in advance for all and any help. Best regards, Ken Sub SendSerialData(ByVal data As String) ' Send strings to a serial port.
19
11251
by: ... | last post by:
Hi I need to send a chr(255) to a serial port. When I send it, through comm.write (chr(255)) it sends a chr(63) ... in Hex, I write chr(&FF) and it actually sends chr(&3F) ... why does this happen, and how can I send it right ? I'm using vb.net 2005 express with framework 2.0 Thanks for an answear ...
3
2329
by: James Prato | last post by:
In C, how do you read data fields from a file that are separated/delimited by a chr(255)? For example, Field1chr(255)Field2chr(255), etc where Fieldx could be NULL.
0
9887
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
10983
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
10648
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
10707
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
1
7883
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5719
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
1
4529
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
4119
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
3164
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.