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SBD sending error Iridium 9522B


firmin Sep 9, 2019 01:14 PM

Hi,

We have an issue with our Iridium 9522B modem.

During two months of test it worked really well ( around 95% of SBD success).

We installed recently the system on the field without changing any "hard" or "soft" settings and the data transmission do not works.

Here is few lines showing the issue:

AT&F0 S0=1 &D0 +IPR=6,0 V0 &K0 &W0 &Y0
0
AT&V
ACTIVE PROFILE:
E1 L2 M1 Q0 V0 W0 X4 Y0 &C1 &D0 &G0 &J0 &K0 &P0 &Q5 &R0 &S0 &X0
S00:001 S01:000 S02:043 S03:013 S04:010 S05:008 S06:004 S07:050
S08:004 S09:006 S10:014 S12:050 S14:162 S16:000 S18:000 S21:032
S22:246 S23:060 S25:005 S26:000 S27:009 S121:001S122:000S127:000
STORED PROFILE 0:
E1 L2 M1 Q0 V0 W0 X4 Y0 &C1 &D0 &G0 &J0 &K0 &P0 &Q5 &R0 &S0 &X0
S00:001 S14:162 S18:000 S21:032 S22:246 S23:060 S25:005 S26:000
S27:009 S121:001S122:000S127:000
STORED PROFILE 1:
E1 L2 M1 Q0 V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &P0 &Q5 &R0 &S0 &X0
S00:000 S14:170 S18:000 S21:048 S22:246 S23:061 S25:005 S26:000
S27:009 S121:001S122:000S127:000
0
AT+SBDWT=HELLO
0
ATV1

OK
AT+SBDI

+SBDI: 2, 401, 2, 0, 0, 0


We can see two issues:

2: An error occurred while attempting to send SBD message from ISU to ESS.

2: An error occurred while attempting to perform a mailbox check or receive a message from the ESS.


Do you have any idea why it is going wrong ?

I go back to the field in October and without a solution I will have to remove the system for the winter season.


Best regards,


Firmin


JDavis Sep 9, 2019 01:35 PM

You should use AT+CSQ to check the signal level before transmitting. Last system I worked on, the customer used signal level 3 as the minimum they would attempt a transmission.

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