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TS-7250-V2 unable to see /dev/ttyS1 and /dev/ttyS2

Hello community:

I have bought the 


I want to use the top 2 expansion rs-232 9pin port 

however I can't see a /dev/ttyS1 or /dev/ttyS2

I don't know what is missing since I got the product preinstalled for my by embeddedarms and didn't touch the inside since it was bought with the TS-ENC720-7200-2ETH enclosure.

I need these 2 interface to connect some sensors together and I can't use other interface as it loose time sync

Wen Bo Ma

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