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Can I add a 2nd serial communication port to a Modular Twido?



Yes. With the Modular Twido you can add an expansion module to it for a second serial communication port.
There are 3 different types expansion modules available:

TWDNOZ232D RS232 mini din connector
TWDNOZ485D RS485 mini din connector
TWDNOZ485T RS485 terminal connector

Note: The Twido line was obsoleted 12/31/2016 and was replaced with the M221 family, this has a USB, serial and Ethernet port depnding on the model and also can add a secondary port if still needed.