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Chapter 3: Operation

Common Commands and Messages

Note: When selecting your baud rate and message types, use the following

calculation to determine your baud rate for your required data throughput.

Messages * Message output rate * Message length (bytes) * bits in byte

Ex: 5 * 20Hz * 40 bytes * 10 = 40,000 bits/sec

For information on message output rates refer to GPS Technical Reference

available from the Hemisphere GPS website at www.hemispheregps.com.

Table 3-2 below through Table 3-4 provide brief descriptions of common

commands and messages for the V102. Refer to the Hemisphere GPS

Technical Reference for more detailed information.

Table 3-2: Commands

Command Description

$JAGE Specify maximum DGPS (COAST) correction age (6 to 8100

seconds)

$JAPP Query or specify receiver application firmware

$JASC Specify ASCII messages to output to specific ports (see ASCII

messages in Table 3-3)

$JBAUD Specify RS-232, RS-422 (output) communication rate

$JBIN Specify binary messages to output to specific ports (see

Table 3- 4 )

$JDIFF Query or specify differential correction mode

$JGEO Query or specify SBAS for current location and SBAS satellites

$JI Query unit’s serial number and firmware versions

$JOFF Turn off all data messages

$JQUERY,GUIDE Query accuracy suitability for navigation

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Directed Electronics VS102 Guía de usuario Pagina 41