Garmin Apollo CNX80 Installation Manual

Also see for Apollo CNX80: User Newsletter User Newsletter Supplemental Flight manual Pilot's guide Data list

Garmin Apollo CNX80 Installation Manual Manual pdf 62 page image

Installation Procedures2-32 560-0982-00 Rev D Apollo CNX80 Installation Manual2.8.10 S ERIAL INTERFACES2.8.10.1 RS232 / RS422The CNX80 provides five bi-directional RS232 serial interfaces, two receive-only RS232 serial interfacesand one bi-directional RS422 serial interface for making optional connections. The serial port can be usedfor connecting to:• Resolvers, indicators, or electronic flight instruments that accept serial data• SL30 for Comm/NAV frequency transfers and DME distance from the database• MX20 to display VOR data on a map and database interface• A second CNX80Serial interface specifications are included in Appendix B.P1-4 RS232 RxD1 P5-1 RS232 RxD5P1-5 RS232 TxD1 P5-21 RS232 TxD5P1-23 Serial Ground 1 P5-41 Serial Ground 5P1-21 RS232 RxD2 P5-2 RS232 RxD6P1-22 RS232 TxD2 P5-22 RS232 TxD6P1-3 Serial Ground 2 P5-42 Serial Ground 6P1-7 RS232 RxD3 P5-10 RS232 RxD7P1-6 RS232 TxD3 P5-30 RS232 RxD8P1-25 Serial Ground 3 P5-44 Serial Ground 7/8P1-11 RS422 RxD4 +P1-26 RS422 RxD4 – P7-5 RESERVED DB30 TxDP1-8 RS422 TxD4 + P7-3 GroundP1-10 RS422 TxD4 –NOTEIn order for a serial port to function correctly, the baud rate of the Rx and Tx channels ona given RS232 or RS422 port must be the same. This must be considered when assigningserial ports to interfacing equipment.The CNX80 can communicate with an SL30 radio using RS232 RxD1 and TxD1. This interface allowsthe SL30 to provide DME station information to the CNX80, which will provide the range to the DMEstation back to the SL30 for display on its front panel.The CNX80 can communicate with a PDA using the infrared sensor on the front bezel. If this feature isused it must be set up on RxD3 and TxD3, not allowing these lines to be used for communication withother devices.The CNX80 can receive air data and fuel data from certain systems on RS232 RxD5, although it isrecommended that if a dedicated altitude encoder is used, it be connected to RS232 RxD8.If two CNX80’s are installed in an aircraft, the RS232 RxD2 and TxD2 lines may be cross connected tocross-fill flight plans and user-defined waypoints from one CNX80 to the other (this feature is notimplemented in the initial version of the CNX80). Altitude data and master/slave control is coordinatedbetween two CNX80’s.