Toshiba AS311 - Manual (Page 10)

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ASCII Interface Module (AS311)
1. AS311 Overview
1.1 Introduction
The ASCII interface module AS311 (hereafter called AS311) is a general purpose data
communication module for Toshiba’s Programmable Controller PROSEC-T3 (hereafter
called T3). By using the AS311, T3 can communicate with external devices, such as a
micro computer, bar code reader, printer, display device, sensor, etc., through the
serial interface RS-232C or RS-422.
The AS311 has two ports of the serial interface. One port (channel 1) can be selected
either RS-232C or RS-422 by switch setting. The other port (channel 2) is RS-232C
interface. These two ports can be used independently for data receiving and
transmitting.
The transmission is asynchronous (start-stop system).
ASCII is used as the transmission data code.
The figure below shows the typical system configuration.
The maximum number of AS311 that can be controlled by one T3 is not limited by
software. However, this module consumes maximum 1 A of internal 5 Vdc power.
Confirm that the total 5 Vdc consumed current per one power supply module is
within the limit (7 A).
CPU module
T3
Channel 2
RS-232C
Channel 1
RS-232C or RS-422
AS311
NOTE