TM8100/TM8200 Computer-Controlled Data Interface (CCDI) Protocol Manual
CCR
73
© Tait Electronics Limited
April 2007
2.9.3
Selcall Decode Sequence
Description
The radio sends this message every time the decoder tone buffer is emptied,
in accordance with the notification criteria set by the “I” command. See
“Set Selcall Parameters” on page 66
and
“Notify Buffer Size” on page 73
.
The sequences received are represented with the tones from the toneset.
Repeat tones and gaps will be forwarded as is.
Response
Vssx...xcc
Where:
Effect
When the radio receives the given SELCALL sequence the radio sends the
decoded sequence to the DTE.
2.9.4
Notify Buffer Size
Description
The number of tones to notify, set by the selcall parameter command, allow
the user to define the size of the decode tone buffer. This buffer sets the
maximum time period that the radio will decode and log tones before
reporting to the user, when continuously receiving valid selcall tones. The
timer is calculated as follows:
Tmax = (N x P) + P
Where:
The buffer timer is started after at least one valid tone has been detected.
The buffer timer is reset if a gap is detected prior to expiry.
Parameter
Value
V
ASCII letter V denotes the Selcall decode message
ss
ASCII hex number ss is the number of parameters
x...x
are the tones decoded within the time window specified by the
notify parameters as follows:
■
ASCII digits 0 to 9
■
Special tones are represented with ASCII letters A to F
■
Gap. A gap in CCR is equal to the tone period set by the Selcall
Parameter command
cc
ASCII hex number cc is the checksum
Parameter
Value
Tmax
Notify buffer maximum time
N
Number of tones
P
Tone period
