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This about the GSM (SIEMENS TC35) ETCARDRS232PORTV10 very complete application information, the design is useful.
GSM(SIEMENS TC35) NETCARD RS232 PORT V10\GSM(SIEMENS TC35) NETCARD RS232 PORT V10.BOM
........................................\GSM(SIEMENS TC35) NETCARD RS232 PORT V10.DBK
........................................\GSM(SIEMENS TC35) NETCARD RS232 PORT V10.DSN
........................................\GSM(SIEMENS TC35) NETCARD RS232 PORT V10.eco
........................................\GSM(SIEMENS TC35) NETCARD RS232 PORT V10.ONL
........................................\gsm(siemens tc35) netcard rs232 port v10.opj
........................................\GSM(SIEMENS TC35) NETCARD RS232 PORT V10.pcb
........................................\GSM(SIEMENS TC35) NETCARD RS232 PORT V10a.eco
........................................\GSM(SIEMENS TC35) NETCARD RS232 PORT V10a.pcb
........................................\gsm(siemens tc35) netcard rs232 port.eco
........................................\_desktop.ini
GSM(SIEMENS TC35) NETCARD RS232 PORT V10