Mitsubishi Electric MELSEC iQ-RJ71C24-R2 - Page 175

7 COMMUNICATIONS BY THE MODEM FUNCTION
7.4 Startup of the Modem Function
173
7
Procedure for data communication
*1 Page 190 Line connection
*2 Page 199 Data communication
*3 Page 202 Line disconnection
C24
0
1
2
3
*
5
*
3
*
indicates processing performed by the user.
Line Connection Waiting side Line Connection Side
C24
or
target
device
Modem Modem
Perform the processing up to
the modem/TA initialization.
Perform the processing up to
the modem/TA initialization.
Modem initialization Modem initialization
Line connection wait state Modem
initialization completion signal (X10 = ON)
Modem initialization completion signal (X10)=ON
Execute line connection.
Line Connection*1
Connection request signal (Y11)=ON
Line connection completed Line connection completed
Connection signal (X12)=ON Connection signal (X12)=ON
Execute data communications.
Execute data communications.
If MC protocol communications are carried
out with the target device, when a remote
password is set in the RCPU, unlock the
remote password.
Remote password unlock processing
Data communication*2
The line is disconnected after data
communications are completed.
Line disconnection*3
Modem disconnection request signal (Y12)=ON
Modem disconnection completed Modem disconnection completed
Connection signal (X12)=OFF Modem disconnection signal (X14)=ON
Connection signal (X12)=OFF
Modem initialization completion signal (X10)=OFF
By completing the line disconnection, lock
processing of the remote password is executed
automatically.
Remote password lock processing
Line connection wait stateModem
initialization completion signal(X10)=ON
If data communications are to be
executed again, start the procedure
from the modem initialization.
If data communications is to be
executed again, carry out
communications after line
connection from the target device.
Shows the value stored for the modem function
sequence status (Address 546 (221H)).