Half-Duplex, Asynchronous System; 1-Bit; Not Provided; Checking Modem Specifications - Mitsubishi Electric FX3U-232-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Remote Maintenance
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
Item
Communication method
Baud rate
Start bit
Data bit
Parity bit
Stop bit
Control line
2. PP modem mode (ch1) and PP modem mode (ch2)
Item
Communication method
Baud rate
Start bit
Data bit
Parity bit
Stop bit
Control line
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.
Contents

Half-duplex, asynchronous system

9600 bps

1-bit

7-bit
Even
1-bit

Not provided

Contents
Half-duplex, asynchronous system
9600 bps
1-bit
8-bit
Not provided
1-bit
Not provided
For the parameter settings of the PLC, refer to Chapter 5.
8 Troubleshooting
8.5 Checking Modem Specifications
I-55
A
B
C
D
E
F
G
H
I
Apx.A