User's Manual

18 | Page
Proprietary and Confidential Revised 10-11-11
Remote Data Command (message type 0x04)
The SXL1 supports remote sensors or other devices that force a satellite transmitted message using
this command. The external interface may relay up to 8 bytes of data for transmission by the SXL1
over the system. Format of the user data is undefined.
The SXL1 acknowledges receipt of the Remote Data Command immediately, then sends the data to
the satellite system using message type 0xCF (Remote Message pg 24).
The Remote Data Command is in the following format:
Bit Mask for Remote Data Command
Bit Parameter Description
Configure (C) or
Query (Q)
63:0 User Defined C
Remote Sensor Alarm Command (message type 0x05)
The SXL1 does support remote sensors or other devices that force a satellite transmitted message
and may optionally enable subsequent reporting using this command. Upon receipt of this command,
the device enters the data parameters into the event table for reporting. If the event table is full, the
device responds to the device with a negative acknowledge message.
If the event table can accept another entry, the SXL1 positively acknowledges receipt of the
command immediately, and then initiates the alarm message function. Alarm messages are standard
on-air Location Messages (pg. 21) with the alarm bits set accordingly. The Remote Sensor Alarm
Command is in the following format:
Bit Mask for Remote Sensor Alarm Command
Bytes Parameter Description
0-1 Sensor Interval
(minutes) + count
Bits 9:0 = alarm-triggered interval
Bits 14:10 = alarm count
Bit 15: 0= report null (0’s) GPS data, 1=insert GPS
3 Message Cause Bits 3:0 = message cause
Sending sensor interval and a count value of zero disables alarm messaging. This can be used to
suspend (terminate) any ongoing alarm messaging.
Sending sensor interval and a count value ranging from 1 to 30 will initiate an alarm immediately and
subsequent messages totaling the count value. Count value of 1 initiates a single alarm message.
Count value of 31 initiates an infinite number of subsequent alarm messages.
The device will send alarm notifications containing or omitting GPS data per the setting of bit 15 of
bytes 0&1.
Alarm triggered interval sets the minutes between first and subsequent alarm messages initiated by
the SXL1. This term “set to zero” instructs the SXL1 to send the alarm message only once.
SXL1 On-Air Message Protocol
The SXL1 transmits data via the embedded satellite transmitter. The SXL1 initiates a satellite
transmission following location determination or to relay engineering data that is useful for evaluating
the health of the device over time. This section describes the on-air messages emanating from the