8SC RS-232 Input Scanner Users Guide Revision 1.
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Helpful hint. Could cause problems later under normal operation. Fatal mistake. The X tells about common assembly and operation errors as well as other things to watch out for. The check is a guide to help the user with assembly and operation. Use them to prevent mistakes. WARNING: NEVER ASSEMBLE ANY NCD DEVICE WITH ORGANIC OR ACID CORE SOLDER. USING THESE TYPES OF SOLDER WILL VOID ALL NCD WARRANTIES.
When data is received by the computer from the 8SC, each pin that is connected to ground will return a unique number. Example: When no inputs are tied to ground, RN2 pulls all inputs high. This returns a 255. When input 1 is the only line connected to ground, a 254 will be returned (255-1, 1 is the weight of input 1). When input 4 is the only line connected to ground, a 247 will be returned (255-8, 8 is the weight of input 4).
Inputs D0-D7 are pulled up via RN2 4.7K resistor network.
The NCD-110C Interface Processor and How It Works: The NCD-110C is a PIC-based computer that has been programmed to listen to incoming data on the serial port and to respond ONLY if its name is called. To understand how it works, we will examine the processes of the 110C as they were written into the chip. The NCD-110C carefully listens to incoming data on an RS-232 serial port. It breaks each byte that is received into two 4-bit sections.
We welcome suggestions and recommendations. Please tell us about any errors or omissions you may find in this manual. All recommendations become the property of NCD Inc. The 8SC Input Scanner is property of National Control Devices. Copyright © 1996, 1997, 1998, 1999, 2000, All Rights Reserved. Amiga is a registered trademark of Commodore Business Machines. IBM is a registered trademark of International Business Machines. Macintosh is a registered trademark of Apple Computer. All Rights Reserved.
