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7 COMMUNICATIONS BY THE MODEM FUNCTION
7.4 Startup of the Modem Function
Line disconnection
The following explains the line disconnection upon communication completion when communicating data with the target
device using the modem functions.
Input/output signals to be used
Use the 'Modem disconnection request' (Y12) and 'Modem disconnection completion' (X14).
• There is no buffer memory for line disconnection processing.
• Line disconnection processing can be conducted from either device as long as the connection is in
progress.
• The line disconnection processing disconnects the line connection with the target device as well as the
connection with the modem on the C24 side.
• Even when an error occurs during the line disconnection, the disconnection processing will be forced.
• When resuming data communication after line disconnection, start form either one of the following
processing depending on the 'Modem initialization completion' (X10).
'Modem initialization completion' is OFF: Start from the initialization of the modem/TA.
'Modem initialization completion' is ON: Start from the line connection with the target device.
X10
X12
Y12
X14
(ON)
X10
X12
Y12
(OFF)
(OFF)
X14
*
Communication
Disconnection
Host station
Modem initialization
completion
Connecting
Modem
disconnection request
Modem disconnection
completion
RS-232 CD terminal
(C24)
Target station
Modem initialization
completion
Connecting
Modem
disconnection request
Modem disconnection
completion
RS-232 CD terminal
This is the procedure to take in order to turn off the initialization completion signal (X10).
In the case of C24, when the line is disconnected from the target device,
the initialization completion signal (X10) at the host station is not turned OFF.
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