7 COMMUNICATIONS BY THE MODEM FUNCTION
7.4 Startup of the Modem Function
193
7
When performing the line connection from the target device after the completion of initialization
• The connection channel on the C24 side is set in the module parameter.
• Abnormal processing when the target device initiate the line connection is left entirely to the target device.
There is no method on the C24 side to check a line connection error occurrence at the target device.
• When a remote password check is performed for the CPU module, normal completion of the unlock
processing enables data communication thereafter.
Considerations during the line connection
• Prior to data communication with target devices, determine when and which station will perform the line connection (dialing)
and line disconnection processing to the target device.
• Use the following method to perform the unlock processing for the CPU module remote password from the target device.
During communication using MC protocol, transmit the dedicated command to the C24 side.
For countermeasures against abnormal completion of the unlock processing, refer to the following section.
(Page 167 When the remote password unlock processing is completed abnormally)
• When reconnecting the line after disconnection, allow several seconds for the modem before turning ON the 'Connection
request' (Y11).
If it (Y11) is turned ON immediately after line disconnection, the modem may not accept the first connection request,
resulting in connection failure, and may require to wait the retry time.
0
(OFF)
Y11
(ON)
X10
(OFF)
X11
X12
*
*
Buffer memory for
connection
(Un\G53)
Connection
request
Modem initialization
completion
Dialing
(Normal connection)
Connecting
(Normal connection)
RS-232 CD terminal
Unlock processing for
the remote password
Result code
receive
Reception
Set "Display a result code
using the AT command" in
the Host station side modem.
Remote
password
Response
Communication using MC protocol
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