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Chapter 16 – GPS Device AT Commands

100 Universal IP AT Commands Reference Guide

GPS Message Syntax

GPS message syntax that is sent from the UIP device to the backend server:

Where

<GPSPREFIX> is the unique prefix. Length is 0 to 4 characters (Character format or requirements usually

provided by backend service)

<GPSURAIS> is the unique remote asset identification string. Length is 0 to 20 characters (This string may be

provided by the backend service)

<NMEA_MESSAGE> is a standard NMEA sentence received from the internal GPS receiver

<CR><LF> is a Carriage Return and a Line feed

The message that will be transmitted can be viewed with the #GPSGETMESSAGE command. The difference from

the viewed message and the transmitted message will be the NMEA message parameters due to timestamp

changes and or location changes.

The <GPSPREFIX><GPSURAIS><NMEA_MESSAGE><CR><LF> is a popular format used by numerous services.

Along with the format, the following rules are followed:

● Typical transmission protocol is UDP (format provided by backend service) due to low overhead, however

TCP is available

● Multiple GPS message can and will be transmitted granted the specific message type is enabled (GPSGPVTG,

GPSGPRMC, etc)

● Typical minimum message type needed by the backend services is usually the GPRMC or GPGGA and GPVTG

messages (Requirement provided by the backend server)

● Do not use the $ character in either the <GPSPREFIX> or <GPSURAIS> sections

● Typical transmission intervals to the backend service are 5sec and greater (requirement provided by

backend server)

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Multitech MTCMR-E1 Manual de usuario Pagina 100