Mitsubishi Electric MELSEC iQ-R Series User Manual page 195

Ex.
When performing the line connection from the target device after the completion of initialization
Buffer memory for
connection
(Un\G53)
(OFF)
Connection Y11
request
(ON)
Modem initialization X10
completion
(OFF)
Dialing
X11
Connecting X12
RS-232 CD terminal
* Set "Display a result code
using the AT command" in
the Host station side modem.
• 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.
(Normal connection)
(Normal connection)
Result code
Reception
receive *
0
Unlock processing for
the remote password
Remote
Response
password
Communication using MC protocol
7 COMMUNICATIONS BY THE MODEM FUNCTION
7.4 Startup of the Modem Function
7
193