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MayDay
Joined: 31 Aug 2006 Posts: 7 Location: Romania
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Laptop without RS232 !!! |
Posted: Mon Oct 09, 2006 12:29 pm |
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Please help me, I have a laptop without RS232. I buy a USB to RS232 converter but my pic programmer doesn't work. On my desktop computer work. The programmer is with external power, I read somewhere that this type of programmer work with convertor USB to RS232 but didn't work. Know
I think to buy a PCMCIA with RS232 but I don't know if it will work. I don't want to buy another think that maybe will not work. Please tell me if anyone know if PCMCIA with RS232 is solution or what I have to do. _________________ Andrei |
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treitmey
Joined: 23 Jan 2004 Posts: 1094 Location: Appleton,WI USA
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Posted: Mon Oct 09, 2006 1:17 pm |
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The programmer gets its power from the USB port.
I figure that your laptop usb isn't providing enough power.
maybe there is a CMOS setting for that. |
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MayDay
Joined: 31 Aug 2006 Posts: 7 Location: Romania
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Posted: Mon Oct 09, 2006 1:22 pm |
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I don't have settings for USB power. I have Toshiba satelitte A10. _________________ Andrei |
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cmdrdan
Joined: 08 Apr 2005 Posts: 25 Location: Washington
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Posted: Mon Oct 09, 2006 2:36 pm |
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I'm using a Quatech dual port PCMCIA card in my Toshiba, and it works fine....
Dan |
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Ttelmah Guest
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Posted: Mon Oct 09, 2006 2:49 pm |
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The simplest answer, is probably to get a USB hub, with external power, and put this between the RS232 adapter, and the laptop, this may solve the problem. However some of these RS232 adapters only generate 5v 'logic level' outputs (check with a meter?). They get away with this for most serial applications, but not for devices that need power. A good PCMCIA RS232 adapter, would also be a solution. However ones that genuinely give traditional RS232 signalling levels are expensive. Units like those from Quatech are great, but come with a price to match...
Best Wishes |
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Guest
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Posted: Mon Oct 09, 2006 4:06 pm |
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I had to go thru 2 different brands of usb-->serial until I got it working...BUT, the POWERED USB hub may be the solution...
~Kam (^8* |
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MCU Guest
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Posted: Mon Oct 09, 2006 9:30 pm |
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You can use USB--->serial port in OS Window But Some OS You can't use it.Sample CNC Program run in Dos OS. |
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MayDay
Joined: 31 Aug 2006 Posts: 7 Location: Romania
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Posted: Tue Oct 10, 2006 9:29 am |
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I messure the voltage on rs232 adapter and indicate aprox 13V.
There is somebody how tried the Red Chief PCMCIA type of card????? _________________ Andrei |
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arunb
Joined: 08 Sep 2003 Posts: 492 Location: India
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Posted: Tue Oct 10, 2006 10:17 pm |
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Hi,
Did you change the port settings on the programmer software (COM 7 COM 5 etc.) ??
Check with your programmer vendor/manufacturer for more details on using USB to serial converters.
I have been using USB to serial converters for quite some time with PICSTART Plus programmers and they work very well...both on my desktop and laptop as well.
thanks
arunb |
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MayDay
Joined: 31 Aug 2006 Posts: 7 Location: Romania
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Posted: Wed Oct 11, 2006 4:01 am |
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I have 10,2 -10,45 voltage on my USB to RS232 convertor (here is the link of convertor type). Is this the good voltage??????? |
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arunb
Joined: 08 Sep 2003 Posts: 492 Location: India
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RE; |
Posted: Wed Oct 11, 2006 4:11 am |
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Hi,
Yes the voltage is normal.
You can check the converter by connecting two computers using a null modem RS 232 cable.
For this start Hyperterminal on both the computers, select a speed of around 19200 Bauds, No parity 8 Bits and 1 Stop Bit , Flow control is set to None, in the Hyperterminal program setup.
Set the above speeds for both the computers. Use the RS 232 null modem cable to connect the computers, in your case between the laptop+converter and the desktop.
Type a character in the desktop , the same character must appear on the laptop, similarly type a character on the laptop anmd this must appear on the desktop.
thanks
arunb |
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MayDay
Joined: 31 Aug 2006 Posts: 7 Location: Romania
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Posted: Wed Oct 11, 2006 4:20 am |
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it works but when I trie to program pic apears the messege: "Verify failed at
address 0000h". :(((((((((((( |
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asmallri
Joined: 12 Aug 2004 Posts: 1634 Location: Perth, Australia
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Posted: Wed Oct 11, 2006 9:48 am |
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Some USB to RS232 adapters will work and some will not and that's just the way it is
It is to do with their RS232 implementation, and how the RS232 control pins are reflected from the RS232 physical inteface to the virtual comm port. It does not make a difference if you add a USB powered or unpowered hub.
What makes a difference is what does you type of programmer expect from the RS232 control (handshaking) pins and what are supported by your converter. IF you try a different brand it may or may not work. _________________ Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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