FRS Signalling Processor
CMX882
In-band tone S0
Dec
0-10
11
Hex
0-$A
$B
Reserved, do not use for S0
Data or other silent (non-voice) call to follow, see S1a
Voice to follow - see S1b
12
$C
13
$D
Reserved, do not use for S0
In-band tone S1a
Dec
0-3
4
Hex
0-3
4
User option for S1a
MSK data to follow
MSK data to follow
MSK data to follow
MSK data to follow
1200b/s
1200b/s
2400b/s
2400b/s
Formatted Blocks
Raw Data
5
5
6
6
Formatted Blocks
Raw Data
7
7
8
8
End of XTCSS coded message (EOM)
Reserved - do not use for S1a
9-13
9-$D
In-band tone S1b
Voice message Compressed
Dec
0
Hex
0
No
Yes
1
1
2-13
2-$D
Reserved, do not use for S1b
Note: Tone numbers in the above tables refer to the Normal tone column as defined in Table 6.
Examples:
Device
Over air
4 tones
Meaning
address
$22
$03
$2C
34C0
03C1
4EB0
Address 34, Un-compressed voice to follow
Address 03, Compressed voice to follow
Address 44, Non voice, user option 0, (E is repeat character)
Note:
For all XTCSS coding the CMX882 will add (in Tx) and strip out (in Rx) the repeat tone as
required. The host µC need only load or read out the normal tones listed in Table 6.
2004 CML Microsystems Plc
33
D/882/7
CMLMICRO [ CML MICROCIRCUITS ]
