Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 245)

AN93
Rev. 1.3 245
Figure 40. Test the Host Interface
Figure 41. Test the Prototype Modem
Host
Controller
Host
UART
Si24xx Si3018 Discretes
RS232
Transceiver
Si24xx Si3018 Discretes
EVB
Prototype System
To
Phone
Line
 Connect prototype system ground to EVB ground
 Disable RS232 transceiver outputs (check evaluation board data sheet)
 Disconnect prototype modem interface
 Connect the evaluation board to the target system
Host
Controller
Host
UART
Si24xx Si3018 Discretes
RS232
Transceiver
Si24xx Si3018 Discretes
EVB
Prototype System
 Connect prototype system ground to EVB ground
 Remove modem module from EVB
 Disconnect host outputs from prototype modem
 Connect EVB RS232 transceivers to prototype modem
 Use PC with HyperTerminal to test prototype modem
To
Phone
Line
PC