Mitsubishi MELSEC L Series User Manual page 118

Line Connection Waiting side
Perform the processing up to the
modem/TA initialization by the
procedure in (1).
Modem initialization
Line connection wait state
Modem initialization completed
signal (X10 = ON)
Line connection completed
Line connect signal (X12)=ON
Execute data communications.
Line disconnection completed
Line connect signal (X12)=OFF
Line connection wait state
Modem initialization completed
signal (X10)=ON
If data communications is to be
executed again, carry out
communications after line connection
from the external device.
3 - 53
(2) Procedure when executing data communications
Q Series C24 Modem
0
1
2
Line Connection
3
(See Section 3.4.6.)
Remote password unlock processing
5
Data communications
(See Section 3.4.7.)
Line disconnection
(See Section 3.4.8.)
Remote password lock processing
3
Shows the value stored for the modem function
sequence status (Address 546 (221
3 COMMUNICATIONS BY THE MODEM FUNCTION
indicates processing
performed by the user.
Line Connection Side
Q Series C24
or
Modem
External Device
Perform the processing up to the
modem/TA initialization by the
procedure in (1).
Modem initialization
Modem initialization
Modem initialization completed signal
(X10)=ON
Execute line connection.
Line connection request signal (Y11)=ON
Line connection completed
Line connect signal (X12)=ON
Execute data communications.
If MC protocol communications are carried
out with the external device, when a remote
password is set in the QCPU, unlock the
remote password.
The line is disconnected after
data communications are
completed.
Line disconnect request signal (Y12)=ON
Line disconnection completed
Line disconnect signal (X14)=ON
Line connect signal (X12)=OFF
Modem initialization completed signal (X10)=OFF
By completing the line disconnection,
lock processing of the remote password
is executed automatically.
If data communications are to be
executed again, start the procedure
from the modem initialization.
)).
H
3 - 53