LCD 64x32 Logic Boards Users Manual
7850 East Gelding Drive • Scottsdale, AZ 85260-3420
LCD 64x32 Logic Boards Users Manual B.doc
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1.877.2BUYNKK (877.228.9655)
•
Phone
480.991.0942
• Fax
480.998.1435
www.nkkswitches.com
0410
8.
Key Terms & Definitions
Module
NKK Switches’ LCD SmartSwitches and SmartDisplays.
Host
Any computer, terminal, or other device that can communicate over the
RS232 line.
Controller
A PCB assembly that controls one or more logic boards and the switches
associated with them. It communicates with a host over the RS232 line.
Logic Board
A PCB assembly with “glue logic” for mounting switches. It is controlled by a
controller.
Byte
An eight bit hex value ranging from 00H to FFH (Decimal 0 to 255). The bit
format of a byte is: (B7 B6 B5 B4 B3 B2 B1 B0) where B7 is most significant
and bit B0 is least significant bit.
Nibble/Hex digit
A four bit value ranging from 0H to FH. A byte consists of two nibbles.
ASCII
A byte value representing a symbol.
Communication
There are two formats to transmit a byte:
Format
1.
Hex format
- A hex byte is transmitted without any change to it. [
xxH
] will
be used to denote this.
All commands and some data are sent by using this format.
2.
ASCII HEX format
- Each nibble of the byte is converted to ASCII code
and sent as a byte. [
xxAH
] will be used to denote this.
For example, the hex byte 5AH is transmitted in two bytes,
35H
and
41H
.
The ASCII value for
5
is
35H
and the ASCII value for
A
is
41H
.
All addresses and most data are sent using this format.
Address
A one byte value ranging from 01H to FFH representing the 255 memory.
