For those who are unable to get a serial cable, I have found that it is possible to get a USB to Serial cable to work on the MP900c. A cable that uses the Prolific PL-2303 USB chip, can use the following driver without modification in most circumstances:
http://www.navpoint.de/images/Freeware/treiber_usb_ce.zip
Simply copy the driver to the 900c and tap on the USBSER.ARM cab file to install the driver. It will say that it is not compatible, simply click install anyway and then do a soft reset. plug in the cable and you are off.
For those cables that use the PL-2303 chip but have a modified VID & PID, follow the instructions below:
A pure generic Prolific 2303 chip cable will also provide the OEM drivers.
An INF file would contain the string:-
VID_067B&PID_2303
where: 067B is the ID for PROLIFIC
and 2303 is
(the device ID for the USB-serial chip
)
x067B and x2303 translate to
(DECIMAL
) 1659 and 8963
(this is imprtant! see later :-
)
)
IF YOUR CABLE CAME SUPPLIED WITH DRIVERS THAT HAVE THIS CODE THEN the manufacturer has retained the OEM ID code in the cable and it should work fine.
If you have an ATEN style cable
(UC232A
) then your INF files for, say, Windows 2K, will have a string like:-
Vid_0557&Pid_2008
where:-
0557 is the hex ID for ATEN manufacturer.
(DEC value 1367
)
2008 is the hex value for the device
(DEC value 8200
)
If your supplied drivers with the cable are neither, thats fine, will sort this one out :-
) Just note down the strings similar to above.
To make the driver recognise the non-OEM cable
(like the ATEN
)we need to change just one keyname in the registry, after installing the USBSER cab the first time.
You need:-
A registry editor for Win CE like PHM Registry Editor
Search for the keyname:-
1659_8963
(this is the DEC values for the generic Prolific drivers as above
)
Which is in HKLM\Drivers\USB\LoadClients
RENAME this key
(click and hold
) to 1367_8200
When you plug in the ATEN cable WIN CE searches the registry for the matching ID and then knows what driver to use.
That's it! Reset the computer and WIN CE wont complain about your cable again. It reads the cable chip, looks for matching the DEC'ed value in the registry and uses that driver.
To verify the device is working plug it in and run the port check and test programs.
Hope this helps!
