458 TMAA01-01 Line-Interface Board TM8100/TM8200 Service Manual© Tait Electronics Limited June 200617.4 Programming InformationThe lines from the radio’s internal options connector that are used by theline-interface board are IOP_GPIO1 to IOP_GPIO4. The behaviour ofthese lines is configured in the Programmable I/O and PTT forms of theprogramming application. Refer to the online help of the programmingapplication for more information.The following table explains the required input and output line-interfaceconnections.sTable 17.6 Line-interface input and output connectionsRadio Signal Function CommentsGPIO1 PTT FROM OPT This signal causes the radio to transmit. This normallyrequires External PTT1 to be set up in the Digital tab ofthe Programmable I/O form and the External PTT (1) tabof the PTT form.GPIO2 Busy/Gate This active high signal allows connection to the Busy/Gateoutput signal. If this is not used, the Action field is set toNo Action and the Active field is set to Low.GPIO3 Busy/Gate (Keying Line) This active high signal allows connection to the Busy/Gate output signal. This signal also allows the single linekeying functionality.GPIO4 AUX This allows the line-interface board to be disabled. One ofthe four control head function keys is selected to controlthis AUX line.For the associated LED to reflect the status of the line-interface board, the Function Key Action field on the KeySettings form must be set to Action Digital Output Line.
