Orient ОС-101 [30/244] Format

Orient ОС-201 [30/244] Format
COMNAV OEM BOARD REFERENCE MANUAL
Chapter 3. Compatible Commands
ComNav Technology Ltd.
11
CNT-OEM-RM001, Rev 1.8
CHAPTER 3. COMPATIBLE COMMANDS
Except for those commands handled by CPU, ComNav board also support GNSS board
commands. This chapter introduces GNSS board commands, including ComNav Board
Commands and NovAtel® Commands.
Along with the release of GPS board developed by ComNav itself, the board command packets
are issued.
The syntax of ComNav board command is similar to that of NovAtel® OEM board. But there
also exist a little difference. Here, we introduce ComNav board command packets, and
NovAtel® OEM Board Commands will be summarized in next section.
3.1 COMMAND FORMATS
In the OEM card, we adopt GNSS card produced by other company, like NovAtel®. So the board
not only supports ComNav commands, but the board commands as well.
3.1.1 Format
The OEM card handles incoming and outgoing data in three different message formats:
Abbreviated ASCII, ASCII, and Binary. This allows for a great deal of versatility in the way the
OEMV family boards can be used. All NovAtel® commands and logs can be entered,
transmitted, output or received in any of the three formats. The board also supports RTCM2.X,
RTCM3.X, RTCM, CMR, and NMEA format message.
ASCII
ASCII messages are readable by both the user and a computer. The structures of all ASCII
messages follow the general conventions as noted here:
1) The lead code identifier for each record is ‘#’.
2) Each log or command is of variable length depending on amount of data and formats.
3) All data fields are delimited by a comma with two exceptions. First exception is the last
header field which is followed by a ‘;’ to denote the start of the data message. Another
one is the last data field, which is followed by a * to indicate end of message data.
4) Each log ends with a hexadecimal number preceded by an asterisk and followed by a line
termination using the carriage return and line feed characters, for example,

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