Problem write string dx100 controller

Good morning
I use a weintek display to get the data from the robot and put it on the Opc_Ua server
If I use the dx200 controller everything ok if I connect it instead in the dx100 controller everything works but does not let me write the strings like never?
in dx200, the s32byte function must be used instead of dx100 only s being working at 16 bytes
I put the same parameters of the dx200 read them but I do not write them
I use the high speed ethernet server protocol
Thank you