7 Software interface 32
Message types 32
General command structure 32
Command timing 33
Command responses 33
Boot-up sequence 33
GPS Date/Time Reference 33
Messages 34
Table of Commands 35
$CS - Configuration Settings 36
$DT - Date/Time 37
$FV - Firmware Version 40
$GJ - GPS Jamming/Spoofing Indication 41
$GN - Geospatial information 43
$GP - GPIO1 Control 46
$GS - GPS Fix Quality 49
$MM - Messages Received Management 52
$MT - Messages to Transmit Management 56
$PO - Power Off 59
$PW - Power Status 60
$RD - Receive Data Message 62
$RS - Restart Device 63
$RT - Receive Test 64
$SL - Sleep mode 67
$M138 - Modem Status 70
$TD - Transmit data 71
November 2021 Swarm M138 Modem Manual - Rev 1.00 6/77
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