XW-4
（
CAS-10
）
Amateur Radio Satellite User's Manual
22
/
31
V2.0 by BA1DU
龚万骢
Parameter
Min ( ms )
Max ( ms )
t1
100
3000
t2
200
3000
5
、
Test mode telemetry data format
：
CAMSAT XW-4 (CAS-10) satellite test mode is used for in-orbit engineering monitoring,
diagnosis and maintenance of the satellite. The test mode is only used when the satellite
passes over China. In the test mode, the telemetry data is sent using AX.25 UI frames,
with 128 bytes of valid data per frame, including: frame synchronization code (2 bytes)
+ satellite telemetry data (12 bytes) + total frame counter (1 byte) + Frame counter (1
byte) + Engineering test and diagnostic data (112 bytes). Every 4 frames form a cycle,
the frame count value of the first frame is a multiple of 4, and 4 frames are downloaded
to the ground every second, with a total of 512 bytes in each cycle.
