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6
1-3
ASCII Unit Internal Configuration
The Common Memory can be accessed using the ASCII Unit’s PC READ or PC
WRITE statements. It can also be accessed using the PC’s WRIT(87/191) and
READ(88/190) instructions. I/O data can be accessed using the ASCII Unit’s PC
GET, PC PUT, and ON PC statements. It can also be accessed using the
MOV(21/030) instruction.
The following figure illustrates these instructions and their relationship to the
Common Memory and the I/O data.
CPU
System
Memory
Work
Memory
BASIC
Program
Memory
BASIC Data
Memory
RS-232C
Interface
RS-232C
Interface
CPU
I/O Bus
Interface
Circuit
Common
Memory
I/O Data
EEPROM
I/O
LED Indicators
DIP Switches
RESET
START
/STOP
ASCII Unit
PC
RS-232C
Connectors
Port 1
Port 2
ASCII Unit Internal Configuration
Section 1-3
Summary of Contents for C500-ASC04
Page 1: ...C500 ASC04 ASCII Unit Operation Manual Revised February 2001 ...
Page 5: ...iv ...
Page 7: ...vi ...