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DEVICE DRIVERS INTERNATIONAL, LLC welcomes you!

-> All DEVICE DRIVERS INTERNATIONAL products are meant to be SIMPLE and EASY.
-> As such, there isn't a ton of documentation. You don't need it.
-> We cannot provide FREE technical support for this driver.
-> Please read the license agreement!


Driver Name:		RS485NT.SYS

Operating System:	Windows NT v4.0

Description:		A generic RS485 driver that utilizes RTS to enable
			the RS485 multi-drop driver enable.

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The driver files:
-----------------      
RS485NT.SYS     Windows NT Kernel-Mode driver
RS485NT.REG     Regsitry entry for the driver

The source files:
-----------------
Q_TEST.C        Quick test of the driver (shows how to use it!)
RS485NT.C       Windows NT 4.0 RS485 driver source code
RS485NT.H       Device extension structure for source code
COM8250.H       Standard 8250 UART defines
RS485IOC.H      IOCTL codes (used in both Q_TEST and RS485NT)

RS485NT.LNR     Linker "Release" command file
RS485NT.LND     Linker "Debug" command file

MAKEFILE        NMAKE compatibile make file
SETENV.BAT      Sets the necessary PATHS for compiling

README.TXT      This file


*NOTE*
------
For obvious reasons we cannot supply the Microsoft tools,
libraries, or includes.

You need to purchase an MSDN subscription!

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Loading the driver:

1) Un-zip the file RS485NT.ZIP in a new directory
2) Copy RS485NT.SYS to the SYSTEM32\DRIVERS directory under
   the Windows NT system directory.
3) Launch REGEDIT.EXE and Import the file RS485NT.REG
4) Adjust the registry entry for RS845NT, if a change is necessary.
   The driver defaults to the settings for COM2, 19200 baud
5) Re-boot the machine

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Building the driver:

1) Make sure SETENV.BAT is modified for your particular system
2) Type NMAKE

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Known problems: 
--------------- 
The Microsoft NT driver SERMOUSE.SYS has a BUG!
If RS485NT is allocated with the same Comport I/O
and IRQ as your mouse, then SERMOUSE.SYS will generate
a page fault and halt Windows NT.

-> IF YOUR MOUSE IS ON COM1, CONFIGURE RS485NT FOR COM2.
-> IF YOUR MOUSE IS ON COM2, COMFIGURE RS485NT FOR COM1.


The fix:	
--------        
If SERMOUSE.SYS page faults, re-boot under another OS or
use the Last Known Good settings, then delete the 
RS485NT.SYS file under the DRIVERS subdirectory.

Use REGEDIT to change the I/O base and IRQ used by RS485NT.SYS
Search for RS485NT and edit any of the registry keys there.


Registry Entries:
-----------------                
Port Address	= 2F8 (COM2) and 3F8 (COM1)
IRQ Line        = 3 (COM2) and 4 (COM1)
Baud Rate       = 19200 (4B00 HEX), 38400 (9600 HEX), 57600 (E100 HEX),
                  15200 (1C200 HEX)
Buffer Size     = Minimum 1024 (400 HEX)

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LICENSE AGREEMENT FOR DEVICE DRIVERS INTERNATIONAL SOFTWARE

This legal agreement between you, the customer or end user, and 
DEVICE DRIVERS INTERNATIONAL gives you certain rights, benefits, and 
obligations.  By breaking any sealed package or by using the product, 
you agree to be bound by the terms of this agreement and indicate that 
you have read, understood, and will comply with these terms.


1.      Product - The term product refers to the software supplied 
        regardless of the media or means by which it is supplied.

2.      License - The license agreement that DEVICE DRIVERS INTERNATIONAL
        grants is to install and use the product.

3.      Copyright Notification - The product contains internal notification 
        of copyright by DEVICE DRIVERS INTERNATIONAL.  The copyright notification 
        must remain intact regardless of any modification or usage of the 
        product.  The internal copyright notification must be displayed at 
        least once during any product usage. Copyright notice must also 
        appear in written form in any documentation you create in support 
        or usage of the product.

4.      You may not sell, lease, distribute, or release the product, in 
        whole or in part, without explicit written permission from 
        DEVICE DRIVERS INTERNATIONAL. 

5.      DEVICE DRIVERS INTERNATIONAL makes no warranties to the product's contents, 
        disclaims any implied warranties of any kind, except that the 
        product will perform functionally in accordance with the written 
        documentation supplied.

6.      DEVICE DRIVERS INTERNATIONAL shall not be liable to any person or entity for 
        any direct, indirect, special, incidental or consequential damages 
        resulting from the use or misuse of its product, including but not 
        limited to loss of business, business profits, or business 
        credibility.

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To Contact us:

        DEVICE DRIVERS INTERNATIONAL       DEVICE DRIVERS INTERNATIONAL
        P.O. Box 451                       7784 Montgomery Rd., Suite #7
        Pine River, MN  56474              Cincinnati, OH 45236-4491
        Tel: 218-587-3120                  Tel: 513-984-4491
        Fax: 218-587-3414                  Fax: 513-984-4697

        Web: www.ddiusa.com

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