Bitmasking and Air724 LTE Module

Question

Looking for a bit (pardon the pun) of help on this one.

I need to set the various band parameters on an Air724 modem as in the descriptor below for the AT*BAND= syntax.

I am in Australia and looking to use the Telstra FDD-LTE Band 3 only. I am seeking some help as to how to get the syntax correct please? That is the bit operations for bands.

Any help is greatly appreciated.

The solution is for an Arduino C compiler, so any C construct would be useful.

Thank you.

SYNTAX

AT*BAND=[<mode>[<GSMband>,<UMTSband>,<LTEbandH>,<LTEbandL>[,<roamingConfig>,<srvDomain>,<bandPriorityFlag>]]]

Note: <mode>: integer type
0 –GSM network
1 –UMTS network
2 –Dual mode(GSM and UMTS) (auto)
3 –Dual mode(GSM and UMTS) (GSM preferred)
4 –Dual mode(GSM and UMTS) (UMTS preferred)
5 –LTE network
6–Dual mode(GSM and LTE)(auto)
7–Dual mode(GSM and LTE)( GSM preferred)
8–Dual mode(GSM and LTE)(LTE preferred)
9–Dual mode(UMTS and LTE)(auto)
10–Dual mode(UMTS and LTE)(UMTS preferred)
11–Dual mode(UMTS and LTE)(LTE preferred)
12–Trip mode(auto)
13–Trip mode(GSM preferred)
14–Trip mode(TD preferred)
15–Trip mode(LTE preferred) 

<GSMband>: integer type <GSMband> is a sum of integers each representing a GSM band
(in other words bit mask)
1 –PGSM 900 (standard or primary)
2 –DCS GSM 1800
4 –PCS GSM 1900
8 –EGSM 900 (extended)
16 –GSM 450
32 –GSM 480
64 –GSM 850 

<UMTSband>: integer type <UMTSband> is a sum of integers each representing a UMTS
band (in other words bit mask)
1 –UMTS_BAND_1
2 –UMTS_BAND_2
4 –UMTS_BAND_3
8 –UMTS_BAND_4
16 –UMTS_BAND_5
32 –UMTS_BAND_6
64 –UMTS_BAND_7
128 –UMTS_BAND_8
256 –UMTS_BAND_9 

<LTEbandH>: integer type <LTEbandH> is a sum of integers each representing a TDD
LTEband (in other words bit mask)
32 –TDLTE_BAND_38
64 –TDLTE _BAND_39
128 –TDLTE _BAND_40
256 –TDLTE _BAND_41 

<LTEbandL> integer type <LTEbandL>is a sum of integers each representing a FDDers each representing a TDDLTEband (in other words bit mask)
32 –TDLTE_BAND_38
64 –TDLTE _BAND_39
128 –TDLTE _BAND_40
256 –TDLTE _BAND_41 

<LTEbandL> integer type 
<LTEbandL>is a sum of integers each representing a FDD
1 –FDDLTE_BAND_1
4 –FDDLTE _BAND_3
8 –FDDLTE _BAND_4
64– FDDLTE _BAND_7
65536 –FDDLTE _BAND_17
524288 –FDDLTE _BAND_20 

<roamingConfig>: integer value
0 –not support
1 –support
2 –no change 

<srvDomain>: integer value
0 –CS only
1 –PS only
2 –CS and PS
3 –ANY
4 –no change 

<bandPriorityFlag>
0 –default
1 –TD-LTE
2 –FDD-LTE 

Answer 1

AT*BAND=6,0,0,0,4

how to get the syntax correct please? That is the bit operations for bands

Ignore bit operations. The text states:

integer type is a sum of integers each representing a GSM band

So for example if you want to support UMTS bands 1. 4 and 9: then you see that 1 –UMTS_BAND_1 with 8 –UMTS_BAND_4 with 256 –UMTS_BAND_9 so you add the numbers 1 + 8 + 256 = 265 and you send the value 265.

Anyway, if you would convert the numbers to binary:

0b000001 –UMTS_BAND_1
0b000010 –UMTS_BAND_2
0b000100 –UMTS_BAND_3
0b001000 –UMTS_BAND_4
... etc. ...

Then you can see that each number has s single bit set. Addition of such numbers is equal to AND bit masking such numbers, as each bit is unqiue..