The pin-outs of the various Twido PLC serial communication ports are as follows:
Compact Twido base:

Below we can see the Modbus connection and some cables:



Note:
The Twido range is discontinued and the possible replacement is the Modicon M221. The software to program this new controller is the EcoStruxure Machine Expert Basic also free.
The software can automatically be migrated to this new platform but check with our support center your architecture to validate the migration.
You can also use our product substitution tool to help you select the replacement for the twido:  https://www.se.com/ww/en/product-substitution/

Released for: Schneider Electric Ireland