CM1481 Datasheet, PDF (22/24 Pages) ON Semiconductor – 2-Channel EMI Filter with ESD Protection for Headsets/Speakers

Functional Descriptions ......
Tone
Allocations
Character
0 thro' 9
Function
Decimal digits in the address or data fields.
A
GROUP character in the address field or ”A_HEX” in the data field.
B
Data prefix tone or “B_HEX” in the data field.
C
REMOTE RESET character address code suffix or “C_HEX” in the data field
D
REMOTE RESET character address code suffix or “D ” in the data field
HEX
E
REPEAT character
F
“F_HEX” in the data field
Table 8 Tone Allocations
International
GROUP
CALL
The international standard for calling a specific group of units by inserting the GROUP-
Tone (‘A’) into a Selcall.
The GROUP-Tone (‘A’) represents all tone digits from 0 to 9. Any character in the Selcall
address can be replaced by a GROUP-Tone (‘A’); a second consecutive GROUP-Tone
should be replaced by a REPEAT-Tone. The flexibility of placing GROUP-Tones within a
Selcall Address allows more user-groups to be set-up.
Example:
Address Sequence
1234A
12A45
1A34A
12AEA
Addressed Units
1 2 3 4 0 to 1 2 3 4 9
1 2 0 4 5 to 1 2 9 4 5
1 0 3 4 0 to 1 9 3 4 9
1 2 0 0 0 to 1 2 9 9 9
Non-
International
GROUP
CALL
To provide compatibility with Selcall systems where the only characters permitted to
follow a GROUP-Tone (‘A’) in a sequence are other GROUP- or REPEAT-Tones.
Under this protocol, the first GROUP-Tone is extended to 3 times the normal system
length.
To transmit to such a system as opposed to an International system, the Extended
GROUP-Tone (Tx) option must be selected at initial configuration. This method restricts
the number of Groups available.
Example:
Address Sequence
Addressed Units
1234A
123AE
12AEA
1AEAE
AEAEA
1 2 3 4 0 to 1 2 3 4 9
1 2 3 0 0 to 1 2 3 9 9
1 2 0 0 0 to 1 2 9 9 9
1 0 0 0 0 to 1 9 9 9 9
0 0 0 0 0 to 9 9 9 9 9
The CM1481 is able to transmit and respond to both International and Non-International
GROUP-Calls.
The Transpond facility (Tp) is not available for GROUP-Calls.
The GROUP-Call character can be configured into any address set-up.
22