Mitsubishi MELSEC L Series User Manual page 141

(5) Line connection program example
3 - 76
3) 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 the user may be
forced to wait for the retry time to elapse.
An example of a line connection program is shown below.
• Example of initiating line connection from the Q series C24 side following the
initialization completion
When the data for connection has been registered from GX Configurator-
SC or from the programmable controller CPU.
• Data for initialization registration
• Data for connection registration
• Modem/TA initialization
3 COMMUNICATIONS BY THE MODEM FUNCTION
X10 : Initialization complete signal
X1E : Ready signal
X1F : WDT error signal
M0 : Accessible flag
M2 : Data registration complete
M3 : Initialization complete flag
M40: Connectable flag
Turns the ready flag ON
Turns the line connectable
flag ON
See Section 3.4.3
See Section 3.4.4
See Section 3.4.5
Line connection command
Sets connection request signals
When the connection in progress
signal ON (normal completion),
sets the connection complete flag
Reads the error code at
connection abnormal completion
Resets the flag with the clear
command
flag for connection
See Section 3.4.4
3 - 76