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1
Chapter
Overview
•
The micro controller is equipped with communication functions from the RS-485 interface and PC loader interface, which
enables the transmission and reception of data between such devices as the personal computer, programmable controller,
and graphic panel.
•
The communication system is composed of a master and slave relationship. Up to thirty-one slaves (micro controllers) may
be connected to one master (such as a personal computer) based on a “single master/multiple slave” method.
•
However, the master can only communicate with one slave at a time. Therefore, each slave is specified by the "Station No."
setting.With PC loader communication, only one slave can be connected to one master.
•
In order to have proper communication between master and slave, the transmission data must be in the same format. This
document explains how to transmit data using the MODBUS protocol format.
•
When using equipment with an RS-232C interface, such as a personal computer, as the master, make sure to use an RS-
232C to RS-485 converter.
•
When using PC loader communication, you can use RS-232C communication with the personal computer by connecting the
PC loader interface on the bottom of this unit with the PC loader communication cable (RS-232C, model:
ZZPPXH1
*
TK4H4563) sold separately.
[RS-232C to RS-485 converter] (Recommended)
Caution
• Systems constructed with the micro controller as slaves do not respond to messages issued by the master
with broadcast queries where the station number is "0".
• PC loader communication is not compatible with the multiple slave method.
Model number/Type
Contact URL
KS3C-10 (insulating type) Made by Omron Corporation http://www.omron.co.jp
RC-77 (insulating type) Made by RA Systems Corporation http://www.ras.co.jp
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