Schematic circuit and PCB of datacable for SIEMENS x55, x65 cellular phones
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The datacable is assembled on MAX3232 and SMD elements. Two-sided PCB with perforation metallization is mounted inside the box of socket DB9 on its lamellas. A phone determine the datacable as DCA-500/510 – depends on an operating mode of COM-port because of a supply from its signals. Siemens EEPROM tool, WinSwup32, V_Klay, Mobile Phone Manager, SiMoCo, etc. works with it normally, i.e. access to contents EEPROM, upgrade software and data exchange pass without problems fast enough.
See also:
Datacable.pdf