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Chapter 2 Specification of Communication port for CPU module

2 – 49

An example of a communication sequence using the Omron-made modem ME3314A is shown below.

[1] Receiving sequence

Modem

EHV-CPU

Mode,

EHV-CPU

Modem

EHV-CPU

AT E 0 Q0 V 0 & C 1 & S0 CR LF

0 CR

Waiting for receiving

2 CR

Forced connection when 3 rings detected

2 CR2 CR

1 CR

Receiving complete

Port communication begins from here

ATA CR

DR on

ER on

Initial setting (*1)

(a)

(b)

(c)

(d)

(a) The PLC generates the AT command for performing the initial setting.

(b) If the initial setting is OK, the modem returns “0”.

(d) Connects the modem.

[2] Disconnect sequence

ode

EHV-CPU

3 CR

Line disconnected (*2)

Port communication end

(a)

(a) The PLC disconnects the line if the result code “3” is returned form the modem.

*1: The initial setting for modem by EHV-CPU sets the minimal items as follows. Therefore, please

set the modem by the AT command connecting a personal computer with the modem before

connecting with EHV-CPU. (Set the DR signal to always ON.) However, do not change the

following initial setting.

Initial setting contents

Command echo : Excluding

Result code : Including

Result code display forma : Number format

*2: Please generate a task code (H1C) of the disconnected request from the host side before

disconnecting the line in practice.

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RTS WM300 Especificaciones Pagina 63

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