TC Series (TCmini/TC200) Driver   
GP-Pro EX Device/PLC Connection Manual
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3.8 Setting Example 8
 Settings of GP-Pro EX 
 Communication Settings
To display the setup screen, from the [Project] menu, point to [System Settings] and select [Device/PLC].
• For External Device, "2" is fixed for Stop Bit. 
For GP-Pro EX, set for Stop Bit as shown below depending on the CPU version.
• Set Wait To Send to 10ms or more.
CPU Version Setting value
TC3-01 TCmini LT3CU01E0 or later 2
less than TCmini LT3CU01E0 1
TC8-00 TCmini LT8CU00D0 or later 2
less than TCmini LT8CU00D0 1