106 Connecting Third-Party Products TM8000 3DK Hardware Developer’s Kit Application ManualSeptember 2003 © Tait Electronics Ltd5.1.3 USB AdaptorAn increasing number of computers (in particular laptop computers) nolonger provide serial COM ports and instead provide USB connections.To connect the radio to a USB port, a USB adaptor is required.Note If the PC has a COM port, the T2000-A19 cable can be con-nected directly to the PC without using a USB adaptor.The PC is typically connected to the microphone connector of the controlhead (TM8115) or to the programming connector of the blank control head(TM8105). The PC can also be connected to the auxiliary connector or, ifan options extender board is installed, to the external options connector.The Rx and Tx signals of these connectors have TLL levels and aredescribed in “Description of the Radio Interfaces”. The TLL level must beconverted to RS-232 level using the Tait T2000-A19 cable. The T2000-A19 cable does not support CTS/RTS hardware handshaking.Figure 5.4 shows typical connections between the radio and the USB portof the PC, and the cables and adaptors required (including Tait productcodes):When installing the USB adaptor, follow the manufacturer’s instructions onhow to install the necessary device driver. The PC will typically see the USBadaptor as a COM port.Figure 5.4 Diagram of radio connected to the USB port of a PCRJ12TMAA20-04T2000-A19 USB adaptorPCTTLRS-232TM8115RJ45 USBDB9RJ12TMAA20-04T2000-A19 USB adaptorPCRJ45 USBDB9TMAA20-02DB9RJ12TMAA20-04T2000-A19 USB adaptorPCRJ45 USBDB9TMAA30-03DB15TTLRS-232TTLRS-232RS-232USBRS-232USBRS-232USBmicrophoneTM8105TM8115TM8105orconnectorprogrammingconnectorauxiliaryconnector