Laptop without RS232 !!!

[MayDay]

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.
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Andrei

[treitmey]

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.

[MayDay]

I don't have settings for USB power. I have Toshiba satelitte A10.
_________________
Andrei

[cmdrdan]

I'm using a Quatech dual port PCMCIA card in my Toshiba, and it works fine....

Dan

[Ttelmah]

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

[Guest]

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*

[MCU]

You can use USB--->serial port in OS Window But Some OS You can't use it.Sample CNC Program run in Dos OS.

[MayDay]

I messure the voltage on rs232 adapter and indicate aprox 13V.
There is somebody how tried the Red Chief PCMCIA type of card?????
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Andrei

[arunb]

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

[MayDay]

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???????

[arunb]

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

[MayDay]

it works but when I trie to program pic apears the messege: "Verify failed at
address 0000h". :((((((((((((

[asmallri]

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.
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Regards, Andrew

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