7 COMMUNICATIONS BY THE MODEM FUNCTION
7.4 Startup of the Modem Function
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Considerations during the line disconnection
• 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.
• If the line is disconnected during data transmission, transmission processing will be performed depending on the signal
status of the C24 RS-232 interface.
• If the line is disconnected during data reception, data reception will be disabled.
This may cause an error occurrence such as a reception time out.
• When data communication is not performed for the period equivalent to the no-communication interval time designation,
C24 will automatically disconnect the line.
When the line is disconnected, the 'Connection' (X12) and the 'Modem initialization completion' (X10) turn OFF, and the
'Modem disconnection completion' (X14) turns ON.
To turn OFF the 'Modem disconnection completion' (X14), turn ON the 'Modem disconnection request' (Y12) for a second
after the 'Modem disconnection completion' (X14) turned ON.
Program for line disconnection
A program example for line disconnection is shown below.
■Program example
Category Label name Description Device
Module label C24_1.stnCH1.bSts_TransmissionNormalCompletion CH1 Transmission normal completion X0
C24_1.stnCH1.bSts_TransmissionAbnormalEnd CH1 Transmission abnormal completion X1
C24_1.bSts_ModemInitializationCompletion Modem initialization completion X10
C24_1.bSts_DialProcessing Dialing X11
C24_1.bSts_ConnectionProcessing Connection X12
C24_1.bSts_Initialization_Connection_AbnormalCompletion Initialization/connection abnormal
completion
X13
C24_1.bSts_DisconnectionCompletion Modem disconnection completion X14
C24_1.bSts_UnitReady Module READY X1E
C24_1.bSts_WatchdogTimerError Watchdog timer error X1F
C24_1.stnCH1.bSet_Req_ReceptionRead CH1 Reception data read request X3
C24_1.stnCH1.bSts_ReceptionAbnormalDetection CH1 Reception abnormal detection X4
C24_1.stnCH1.bSet_Req_Transmission CH1 Transmission request Y0
C24_1.stnCH1.bSet_Req_ReceptionReadCompletion CH1 Reception data read completion Y1
C24_1.bSet_Req_ModemInitialization Modem initialization request Y10
C24_1.bSet_Req_Connection Connection request Y11
C24_1.bSet_Req_Disconnection Modem disconnection request Y12
C24_1.uErrorCode_ModemFunction_D Modern function error code U0\G545
C24_1.wnForUserRegistrationNo8001H_D[0] For user registration number 8001H U0\G6912
C24_1.wnForUserRegistrationNo8002H_D[0] For user registration number 8002H U0\G6953
Label to be defined Define the global label as shown below.
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