Company Confidential
21
Raveon Technologies Corp.
function bits in the pager message. If they do, then the M8T can be set to
automatically select paging format.
If the user wishes to force the M8T to decode messages in a particular format,
then set the data format manually using the DF command.
DF 0
(numeric),
DF 1
(alphanumeric),
DF 2
(tone),
DF 3
(auto select).
7.3.
Numeric Messages
When the pager receives a numeric page, it outputs the numeric digits via its
RXD output pin on the I/o connector. The baud rate of the serial port is set with
the
ATBD
command. The outputted characters are ACSII representations of the
BCD numeric digits.
BCD numeric encoding packs 4 bit BCD symbols 5 to a message code word into
bits 30-11. 0-9 are encoded as ASCII 0-9. Values beyond 9 in each nibble (i.e.
0xA through 0xF) are encoded as follows:
•
0xA Reserved (possibly used for address extension)
•
0xB Character U (urgency)
•
0xC " ", Space (blank)
•
0xD "-", Hyphen (or dash)
•
0xE ")", Left bracket
•
0xF "(", Right bracket
Over the air, BCD messages are normally space padded with trailing 0xC's to fill
the code word. The M8T output ASCII characters representing the numeric digits
as shown in this table:
Numeric
Digit
ASCII
ASCII Code
Numeric
Digit
ASCII
ASCII
Code
0x0
0
0x30
0x8
8
0x38
0x1
1
0x31
0x9
9
0x39
0x2
2
0x32
0xA
*
0x2A
0x3
3
0x33
0xB
U
0x55
0x4
4
0x34
0xC
space
0x20
0x5
5
0x35
0xD
-
0x2D
0x6
6
0x36
0xE
)
0x29
0x7
7
0x37
0xF
(
0x28
7.4.
Alphanumeric Messages
When the pager receives an alphanumeric page, it outputs the charactors via its
RXD output pin on the I/o connector. The baud rate of the serial port is set with
the
ATBD
command.
