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Computer with PS2 only to connect to RS232 DB9 device?

M

Michal

Jan 1, 1970
0
Hello,

I was wondering if someone knows how to do this. There are adapters from
PS2>DB9 normally intended for mice, but I have a reverse situation:

I need to connect a RS232 device (specialized digital modem) to a laptop
only equipped with PS2 port.

Normally the modem would use its proprietary software which uses COM1 on
normally present DB9 on the PC and everything works.

However in this case there is no DB9 on my laptop. QQ:

1. Is there a way to buil some kind of adaptor to translate computer PS2
port to RS232 DB9?

2. If 1st is positive- can I then define the PS2 in this laptop to act
as COM1 and communicate via this adapter with external RS232 device?

Thanks for any clues, Regards M
 
G

Garrett Mace

Jan 1, 1970
0
Michal said:
Hello,

I was wondering if someone knows how to do this. There are adapters from
PS2>DB9 normally intended for mice, but I have a reverse situation:

I need to connect a RS232 device (specialized digital modem) to a laptop
only equipped with PS2 port.

Normally the modem would use its proprietary software which uses COM1 on
normally present DB9 on the PC and everything works.

However in this case there is no DB9 on my laptop. QQ:

1. Is there a way to buil some kind of adaptor to translate computer PS2
port to RS232 DB9?

2. If 1st is positive- can I then define the PS2 in this laptop to act
as COM1 and communicate via this adapter with external RS232 device?

Thanks for any clues, Regards M


I wouldn't bet my life on it being impossible to do, but that's what I'm
thinking. There's a lot of rewriting that would be required in the operating
system or BIOS, and I haven't even checked the difference in transmission
speed. It would be a very involved project even if it was possible.

The mouse adaptors are NOT RS232 to PS/2 adaptors. They reroute a few
signals and possibly put a resistor across a pin or two, in order to signal
to the mouse what kind of connector is being used. The mouse microcontroller
then selects either serial or PS/2 operating mode based on that information.
This is also commonly done with USB; that little adapter is NOT a generic
USB to PS/2 adapter.

Odds are very very good that your laptop has a PCMCIA or CardBus slot. Many
serial port cards exist, you can buy one pretty cheaply new or used. Your
application will work properly with such a card.
 
P

petrus bitbyter

Jan 1, 1970
0
Michal said:
Hello,

I was wondering if someone knows how to do this. There are adapters from
PS2>DB9 normally intended for mice, but I have a reverse situation:

I need to connect a RS232 device (specialized digital modem) to a laptop
only equipped with PS2 port.

Normally the modem would use its proprietary software which uses COM1 on
normally present DB9 on the PC and everything works.

However in this case there is no DB9 on my laptop. QQ:

1. Is there a way to buil some kind of adaptor to translate computer PS2
port to RS232 DB9?

2. If 1st is positive- can I then define the PS2 in this laptop to act
as COM1 and communicate via this adapter with external RS232 device?

Thanks for any clues, Regards M

If your laptop has no RS232 it almost certainly has USB. USB to RS232
converters are quite common these days and not that expensive. They use to
come with appropriate drivers so they can be considered normal COM-ports as
far as your software concerns.

petrus
 
T

Thomas Lutz

Jan 1, 1970
0
The PS2 port is not a RS232 serial port therefore you cannot use it as
one. Probably the easiest thing to do would be to get a RS232 - USB
add-on serial adapter. They are basically a small cable with a RS232
DB9 on one side and a USB connector on the other. You plug the adapter
into the USB port on your PC and then install a driver that comes with
the adapter. When the adapter is connected to the USB port, windows
behaves as if it has another COM port installed and any serial
communication software can use the port just as if it were built into
the motherboard.

For more serial I/O tips tricks and free utilities, visit
www.taltech.com
 
J

Jerry Greenberg

Jan 1, 1970
0
The PS2 port is not a serial port, even though you see that there is a
mouse that can use it. The mouse is not realy serial. it is compatable
to work this way from its internal firmware, and design.

You can get a PCM type serial module that plugs in to one of the
external PCM slots on your laptop. Most have this. This adabtor will
give you the serial port you need. Or, you can get a USB to serial
adabtor. The said devices will come with the proper software, and use
drivers that are designed in to Windows to do what you want.

This would be your best solution.


Jerry G.
========
http://www.zoom-one.com
 
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