hello friends,
I am looking for information about the Serial Bus Interface (for the old SIPART bus with RS232 communication) for the SIPART DR 20.
I have looked for this information in the siemens webs, and appears even the information of the SIPART DR 19 ( Serial SIPART 6DR190x Bus Interface ), but nothing of the SIPART DR 20.
Somebody could share with me this information ?

Thanks in advanced.