Abstract: A protocol converter that translates the ARINC-429 protocol output of an Inertial Navigation System to the National Marine Electronics Association 0183 protocol. The protocol converter includes an ARINC-429 interface board with cable and software operating in a computer with at least one serial communications port. The software includes a protocol conversion program which is capable of outputting the NMEA-0183 protocol to as many as four serial communications ports simultaneously.

Abstract: A protocol converter that translates the ARINC-429 protocol output of an Inertial Navigation System to the National Marine Electronics Association 0183 protocol. The protocol converter includes an ARINC-429 interface board with cable and software operating in a computer with at least one serial communications port. The software includes a protocol conversion program which is capable of outputting the NMEA-0183 protocol to as many as four serial communications ports simultaneously.

Abstract: A PCM encoder which receives asynchronous serial data and incorporating the serial data and eight channels of analog data into a PCM data stream. The encoder includes a microprocessor which processes the serial data provided in eight bit digital words and the analog data which the microprocessor converts to twelve bit digital words. The encoder also has a programmable gate array which receives six bits of data during each transfer of data from the microprocessor to the gate array. The gate array for the PCM encoder also receives a Frame Sync, and then processes the data to provide a data stream containing NRZL data and Bi Phase data.

Abstract: A monitoring apparatus which allows the user to monitor transmit and receive data of half duplex communications taking place over a full duplex RS-232 bus and also monitor full duplex communications on the RS-232 bus. The monitoring apparatus includes six switching transistors which are turned on and off depending on input voltage levels appearing at the transmit and receive lines input to the monitoring apparatus from the RS-232 bus. Turning on and off the switching transistors enables a computer, lap top or other device connected to the monitoring apparatus to receive and process data communications on the RS-232 bus.

Abstract: A monitoring apparatus which allows the user to monitor transmit and receive data of half duplex communications taking place over a full duplex RS-232 bus and also monitor full duplex communications on the RS-232 bus. The monitoring apparatus includes six switching transistors which are turned on and off depending on input voltage levels appearing at the transmit and receive lines input to the monitoring apparatus from the RS-232 bus. Turning on and off the switching transistors enables a computer, lap top or other device connected to the monitoring apparatus to receive and process data communications on the RS-232 bus.