Please check Siemens manual collection CD -- the file DPASI_e.pdf, P21\P22\P112.
The input range is 20-30V .
"The ASi power supply unit has data decoupling and supplies a voltage of approximately 30 VDC."
-------摘自
http://www.gktd.com/dispbbs.asp?BoardID=2&ID=3895&replyID=34757&skin=1