Software Configuration Of J.net System - Hitachi S10mini Hardware Manual

4 USER GUIDE

4.1 Software Configuration of J.NET System

The software configuration of the J.NET system is shown in the figure below. The communication
control programs, transmission handler, reception handler, and sub-OS in the figure need not be
loaded into memory by the user because they are ROM programs.
User program
NET status
S-register
Send area
Receive area
I/O area
CPU
: ROM program
: User-created program
: Table or buffer
* The external device can be connected as required (RS-232C).
Slave
parameter
table
S-table
Communication
Send buffer
control program
Receive buffer
Transmission
handler
I/O buffer
Reception
handler
Sub-OS
J.NET
ROM
Cable
4-2
ROM
Communication
control program
RAM
Buffer
J.STATION
Communication
control circuit
External device*
Communication
control circuit
Send area Receive area
User program
PI/O