Page 4-20 GNS 400W Series Installation ManualRev. G 190-00356-084.9 RMI/OBI4.9.1 RMI/OBI FunctionThe MAIN OBI output provides bearing information from the active waypoint for Bendix/King SerialOBI devices based upon the 400W Series unit‘s GPS navigation. For the GNS 430W, the MAIN OBIoutput may be configured so that it sends VOR/ILS bearing information when VLOC is selected by theGNS 430W CDI key.The VOR OBI output provides bearing information from the currently tuned VOR station forBendix/King Serial OBI devices based upon the GNS 430W VOR receiver. When a localizer channel istuned on the VLOC window, there is a bit in the data stream set to indicate that a localizer frequency istuned which stows the needle or drives it to the 3 o‘clock position.4.9.2 RMI/OBI Electrical CharacteristicsPin Name Connector Pin I/OMAIN OBI CLOCK P4001 43 OutMAIN OBI SYNC P4001 45 OutMAIN OBI DATA P4001 44 OutPin Name Connector Pin I/OVOR OBI CLOCK P4006 25 OutVOR OBI SYNC P4006 26 OutVOR OBI DATA P4006 27 OutThe output driver is active low. The driver output voltage is not more than 1.0 V when sinking 20 mA.The maximum off state leakage current with respect to ground is less than 10 A.4.9.3 RMI/OBI ConfigurationFor the GNS 430W, refer to Section 5.3.11 for the MAIN OBI source configuration.4.9.4 RMI/OBI Calibration and CheckoutRefer to Section 5.5.6.11 for calibration and checkout.4.9.5 RMI/OBI InterconnectRefer to Figure H-21 for the RMI/OBI interconnect.
