Espec RS485 error 0

Hello everyone, 

Currently, i work on an oven from Espec, the EHS 221MD for HAST reliability

test and i want to be able to communicate with to collect some data ( temperature, humidity...) and start / stop the tests. 

This oven work with RS485 serial communication.

I got the codes to send to do this from the manufacturer, but each time i start my VI(see attachement) , i have this error : 

I don't really know, why i have this error, maybe a hardware problem from my converter ?  (MAX detects it)   

As converter, i use a MOXA Uport 1100, i use it on RS485 4wire and I have perform this as wiring : 

Can someone help me with this.

Thanks in advance for your answer.  

Regards,

Lucas