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The operation of the max chars option is similar to the max time setting except that the serial port stops
sampling after a certain number of characters has been received. In most cases where the max-chars
setting is used to terminate serial capture, the max-time setting is also used to end the serial measurement
in the event that data does not arrive.
In Serial capture mode, in systems where many messages are sent and only a few are of interest, a start
string of up to 10 characters can be enabled. For instance, in a typical GPS serial NMEA feed, the
following are a subset of available messages:
• DTM - Datum being used.
• GGA - Fix information
• GLL - Lat/Lon data
• GSA - Overall Satellite data
• GSV - Detailed Satellite data
• RMC - Recommended minimum data for GPS
• RTE - Route message
• VTG - Vector track an Speed over the Ground
If in the application, the user is only interested in receiving the GGA message, then a start string can be set
to GGA. In that way, any messages starting with DTM, GLL, GSA or other unwanted messages will be
discarded.
Note If a start string is enabled, the ORB will stay awake until the string is received or until the max-time is
reached.
In firmware revisions less than 2, serial start strings are specified as text, with special characters such as
carriage return and line feed being specified by their respective escape sequences. A list of allowable
escape sequences is given below:
• \f Form-feed
• \n Newline (Line Feed)
• \r Carriage Return
• \t Horizontal Tab
• \v Vertical Tab
• \ Backslash
Note Because escape sequences start with a backslash (\), if a capture string contains a backslash, it needs
to be escaped and so is represented as a double backslash (\).
In firmware release 2 and above, serial start strings are specified as text, with special characters such as
carriage return and line feed being specified by their respective ASCII codes in hexadecimal. A list of
example hexadecimal sequences is given below:
• x0C Form-feed
• x0A Newline (Line Feed)
• x0D Carriage Return
• x09 Horizontal Tab
ORB User Guide, Release 1.1
60
Chapter 6. External Sensors
Содержание ORB-X1-G
Страница 1: ...ORB User Guide Release 1 1 Senquip Sep 14 2020...
Страница 2: ......
Страница 16: ...ORB User Guide Release 1 1 10 Chapter 1 Introduction...
Страница 44: ...ORB User Guide Release 1 1 38 Chapter 3 Power Supply...
Страница 50: ...ORB User Guide Release 1 1 44 Chapter 4 General Setup...
Страница 86: ...ORB User Guide Release 1 1 80 Chapter 6 External Sensors...
Страница 92: ...ORB User Guide Release 1 1 86 Chapter 7 Network Connection...
Страница 98: ...ORB User Guide Release 1 1 92 Chapter 8 Endpoint Setup...
Страница 110: ...Figure 10 2 Dimensioned side view ORB User Guide Release 1 1 104 Chapter 10 Mechanical Speci cation...
Страница 111: ...Figure 10 3 Dimensioned side view including mounting brackets ORB User Guide Release 1 1 10 1 Mechanical drawings 105...
Страница 116: ...ORB User Guide Release 1 1 110 Chapter 10 Mechanical Speci cation...
Страница 130: ...ORB User Guide Release 1 1 124 Chapter 12 Troubleshooting Guide...
Страница 134: ...ORB User Guide Release 1 1 128 Index...
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