<span style="font-family: courier new,courier;">Hello all, I would do a sim-emulator software that runs on my PC.</span><br /><span style="font-family: courier new,courier;">First thing to do is a an interface to connect my PC with sim slot phone.</span><br /><span style="font-family: courier new,courier;">So I am using this simple interface :</span><br /><br /><span style="font-family: courier new,courier;">I took a CP2102 module, see this page for example http://esaid.free.fr/Cdotnet/USB_serial.htm,</span><br /><span style="font-family: courier new,courier;">then I have put a diode between TXD and RXD, then I have connected RXD to I/O of phone sim slot,</span><br /><span style="font-family: courier new,courier;">DSR of CP2102 module to RESET of phone sim slot and connected the two grounds.</span><br /><br /><br /><span style="font-family: courier new,courier;">
__________ </span><br /><span style="font-family: courier new,courier;"> | |________ TXD </span><br /><span style="font-family: courier new,courier;">+5V------| |
| </span><br /><span style="font-family: courier new,courier;"> DP------| CP2102 |___ /__ RXD ------- I/O phone sim slot </span><br /><span style="font-family: courier new,courier;"> DM------| | </span><br /><span style="font-family: courier new,courier;"> GND-----| |--------- DSR ------- RESET phone sim slot</span><br /><span
style="font-family: courier new,courier;"> | | </span><br /><span style="font-family: courier new,courier;"> |_________|-------- GND ------- GND phone sim slot </span><br /><br /><br />I have tested this interface with a phone , I can detect reset from phone then I send this ATR: 3B 16 95 D0 01 7B BD 0D 00 ( this is the ATR I can read form a real sim card with a phoenix reader),<br />but I don't have any response from phone.<br />Any help is appreciated, thanks.<br />