I-48
FX Series PLC User's Manual - Data Communication Edition
Remote Maintenance
8 Troubleshooting
8.5 Checking Modem Specifications
8.5 Checking Modem Specifications
In a modem in which the following communication specifications are not applicable, remote maintenance can
be used.
Check the modem specifications.
1. In the case of user registration mode
2. PP modem mode (ch1) and PP modem mode (ch2)
8.6 Checking Setting in PLC
Check the parameters, AT command and sequence programs in the PLC.
After changing any parameters, make sure to turn OFF the PLC power, and then turn it ON again.
8.6.1 Checking parameters in PLC
1. Checking the communication setting
Verify that non-protocol communication, computer link communication, etc. are not set in the parameters of
the FX PLC. If such communication is already set, remote maintenance cannot be used.
2. Checking the modem initialization setting
Verify that the modem initialization is selected correctly in parameters in the FX PLC.
If the modem initialization is not set correctly, normal communication is not possible.
→ For the parameter settings of the PLC, refer to Chapter 5.
Item Contents
Communication method Half-duplex, asynchronous system
Baud rate 9600 bps
Start bit 1-bit
Data bit 7-bit
Parity bit Even
Stop bit 1-bit
Control line Not provided
Item Contents
Communication method Half-duplex, asynchronous system
Baud rate 9600 bps
Start bit 1-bit
Data bit 8-bit
Parity bit Not provided
Stop bit 1-bit
Control line Not provided
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