Communication Is Not Available Via The Modem - Mitsubishi QJ71C24N User Manual

11 TROUBLESHOOTING

11.3.16 Communication is not available via the modem.

Symptom
• A modem initialization error occurs.
• Modem connection channel designation
• Auto modem initialization
is not performed.
cannot be executed.
• There is an error in the switch settings in
the GX Developer.
• Communication protocol setting is
incorrect.
• Data cannot be
communicated with GX
• Transmission setting does not match the
Developer supporting the external device.
Q series C24.
• Communication rate does not match the
external device.
• The product is not supported by the GX
Developer.
• The GX Developer does
not receive the callback
• There was an error in the GX Developer
signals from the Q Series connection system.
C24.
• There is an error in the GX Developer
side's modem settings.
• There s an error in the GX Developer's
• Callback connections
connection system.
from the GX Developer
are refused by the Q
• There is an error in the connection
Series C24.
system's telephone No.
• There is an error in the Q Series C24
• When performing Auto
setting value.
(callback: during fixed/
during designated • There is an error in the GX Developer's
number) from the GX
connection system.
Developer, connection to
the Q Series C24 is
• There is an error in the telephone No. of
refused.
the connection system.
• It is possible to connect
• The timer value for the status of the
from the GX Developer,
modem used or the line is short.
but callback from the Q
Series C24 cannot be
• There is a problem with the modem
performed.
specifications or settings.
11 - 53
Cause
• Check the error code and execute
processing accordingly.
• Set Modem connection channel
designation.
• Review the switch settings. Set it to
match the local station modem and the
TA.
• Set the communication protocol to MC
protocol, format 5.
• Review the transmission setting.
• Review the communication rate setting.
• Confirm the GX Developer's S/W
version.
• Check the GX Developer's connection
system.
• Set the connection system on "callback
reception waiting" and connect.
• Set the modem's settings on "Auto
Reception."
• Check the GX Developer's connection
system.
• Correct the Q Series C24's settings.
• Check the telephone No.
• Change the telephone No. to the data
for callback.
• Set the callback function designation on
the setting 1 to 3.
• Check the GX Developer's connection
system.
• Check the Q Series C24's settings.
• Check the telephone No.
• Change the telephone No. to the data
for callback.
• Adjust each of the timer values for the
callback function on the GX Developer
side. (Line callback cancel wait time,
callback delay time)
• Check the modem's specifications and
settings.
Corrective action MC
MELSEC-Q
Non
Bidirectional
procedure Pre-defined
protocol
protocol
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