Re: Q: PS2 to USB Virtual Serial Com Port and/or something or other
- From: Iwo Mergler <Iwo.Mergler@xxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 21 Dec 2006 10:31:37 +0000
Dave Martindale wrote:
Now, I have a laptop without serial ports. It only
has 2 usbs and some kind of expansion connector 3. I need to
connect the mouse's ps2 to the laptop's usb and set the usb up as
somekind of virtual serial com port that will facilitate
communication from the gps mouse to Microsoft's Streets & Trips
software.
The *easiest* thing to do is buy a new GPS mouse with a single USB plug.
There is a version of Streets&Trips that includes such a mouse.
If you're determined to use the old mouse, you'll need two adapters.
For power, you'll need a cable with a male A USB plug on one end and a
4-pin mini-DIN (PS2) female on the other end, one which connects USB
power and ground to PS2 power and ground.
For data, you'll have to buy a USB-serial adapter. This isn't a cable;
it actually has a small CPU inside it. It has a USB interface on one
side and a serial port on the other, and passes data between the two.
There's no way to make a USB port speak serial data or vice versa
without such an adapter.
If you're not afraid of a soldering iron, you can tap 5V DC from
the USB-serial converter.
You could convert your PS/2 powered serial GPS into a USB one using
the guts from a USB-serial converter.
This is roughly the block diagram of a USB-serial converter:
USB cable USBserial RS232 level Serial port
Chip shifter
+-----------------------+
| +----------+ | /|
--VBus---+--| | +------+ / |
-- D+ ------| |-----| |----| |
-- D- ------| |-----| |----| |
--GND ---+--| |-----| |----| |
| +----------+ +------+ \ |
| | \|
+-----------------------+
You need to attach the two power wires from the PS/2 adapter
to the VBus and GND lines of the USB-serial adapter. VBus
is normally red, GND is normally black.
Kind regards,
Iwo
.
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