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CI853 not transmitting

Hi,

We combination where we have one CI853 and we are communicating through it with 2 MODBUS line (both ports in use) and there is Phoenix serial converter. The card has to be rebooted to get communication working again every now and then. The Rx lights are blinking all the time but Tx will stop blinking at some point and then communication is not working anymore because external system will not get any data from our side. Have you any idea that is there some issue with firmware or do we have wrong settings? SW side (CCB) is happy without any errors so basically everything is going all the way to the CI853 but not further.

Thanks in advance!

Markus