Garmin GPS 10x Technical Specifications

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190-00769-00 GPS 10x Technical Specifications Rev. APage 13APPENDIX A: BINARY PHASE OUTPUT FORMATIn binary phase output mode, GPS 10x series products will transmit two types of packets once per second.One record contains primarily post-process information such as position and velocity information. Thesecond record contains receiver measurement information.Refer to the Garmin Device Interface Specification for details on how to form and parse Garmin packets.At the time of this printing, these specs are available from the technical suppport section of our Web site athttp://www.garmin.com/support/commProtocol.html.For the GPS 10, the two records must be enabled independently by commands to the unit. The ID of eachcommand should be 10 decimal to signify that the record is a command. The data portion of the packetshould be one of the following:Function Command (base 10)Position Record On 49Position Record Off 50Receiver Measurement Record On 110Receiver Measurement Record Off 111Note that the satellite data information is also enabled when the position record is enabled.Records sent over RS232 begin with a delimiter byte (10 hex). The second byte identifies the record type(33 hex for a position record and 72 hex for a satellite data record). The third byte indicates the size of thedata. The fourth byte is the first byte of data. The data is then followed by a checksum byte, a delimiterbyte (10 hex), and an end-of-transmission character (03 hex). Additionally, any DLEs (0x10) that appearbetween the delimeters are escaped with a second DLE. There is sample code at the end of this section thatwill strip off the DLEs and ETXs.RS232 Packet:- 0x10 (DLE is first byte)- 0x## (Record ID – single byte)- 0x## (Number of data bytes – single byte)- data bytes (See descriptions below)- 0x## (2’s complement of the arithmetic sum of the bytes between the delimiters)- 0x10 (DLE)- 0x03 (ETX is last byte)USB packets contain only the record ID, size, and data payload. Refer to the Garmin Device InterfaceSpecification for details on how to form and parse Garmin USB packets. The document is located on theGarmin Web site at http://www.garmin.com/support/ commProtocol.html.USB Packet:- 0x## (Record ID – single byte)- 0x## (Number of data bytes – single byte)- data bytes (See descriptions below)The data bytes of each packet contain the record specified by the record ID. A description of each recordfollows.