> 15.3.3 | Serial Interface Scenario (XSAP)

> This example describes the connection of two cellular engines. It is recommended that the instructions be followed in the order that they are presented:

> • | Install two WinMux drivers on the PC and connect each ME to the physical port of a Multiplexer.

> • | Connect the PC application "ComBridge" to one virtual COM port of each Multiplexer. This establishes a communication link between the two cellular engines. Bear in mind that AT commands can still be issued on both cellular engines using the remaining serial channels.

> • | Select the "ComBridge" XSAP filter.

> • | Open the XSAP "Config Filter" menu and deactivate the "Startup - Send Initialization" and the "Shutdown - Switch back to local SIM" tags. However, the appropriate device IDs need to be entered in the "Startup" frame.

> • | Press the "ComBridge - start" button to connect both MEs.

> • | Start the SAP client via AT command "AT^SRSA=2,2,3,0", if multiplexer channel 3 is used.

> • | Start the SAP server via AT command "AT^SRSA=1,1,3,0", if multiplexer channel 3 is used.