Программирование пейджеров NEC по эфиру ограничено только разрешением-запрещением соответствующих CAP-кодов.
Receiving inhibition allows any address to be protected by a command
sent by the paging base station. A protect address can no longer receive
message data until the address is unlocked by the release command
transmitted from the base station. Once the pager has received the
protect or release command, it is stored in the EEPROM so that removing
the battery will not cancel the command. Please ensure that the
confidentiallity of this information is maintained.
Transmission sequence
The control characters
which initiate the lock and unlock conditions directly follow the
pager's first address ID, and take the form of message codewords.
Receiving inhibition must be set to 'YES' in the ID ROM. On some models,
certain fields can be changed to suit the operators needs. Each pagers'
code programmer will indicate which fields are programmable/ Please
contact me if you need future information about this.
Format
The order of transmission
for receiving inhibitions is as follows:
1) |
SOH |
Start
of heading |
2) |
h |
Function
control |
3) |
Table
1 |
Inhibit
control |
4) |
Table
2 |
ID
designation |
5) |
Table
3 |
Function
bits designation |
6) |
STX |
Statr
of test |
Please refer to the
tables below for the variables
TABLE
1
|
TABLE
2 |
TABLE
3 |
FUNCTION |
CODE |
ID
DESIGNATE |
CODE |
FUNCTION
BITS |
CODE |
Inhibit |
h |
1 |
Q |
00 |
h |
Cancel
inhibit |
Q |
2 |
SUB |
01 |
Q |
|
|
3 |
# |
10 |
SUB |
|
|
4 |
4 |
11 |
# |
|
|
5 |
CR |
|
|
|
|
6 |
F |
|
|
Each of the control
characters shown above can be found in the character set in CCITT
international alphabet No.5 (7 bits per character) code table. The bits
for each character required are sent in order, starting with bit number
1 (least significant bit)/ Characters are sent in the same order as they
are to be read and are packed into message codewords.
The complete message is
broken into a series of 20-bit blocks, as to fill continuous message
codewords. The first bit is set to 1 which identoifies the codeword as a
message codeword, and the next 19 are message bits. This is transmitted
in one codeword with the required redundancy and even party bits, which
should give a total 32 bits. The message may be split between one
message codeword and the next.
Example
Suppose it is required to
'lock' address 2, subaddress A, then following sequence should be
transmitted after the pager's individual address, applying the rules set
out above
1) |
SOH |
2) |
h |
3) |
h |
4) |
SUB |
5) |
h |
6) |
STX |
Для NEC21 посылки могут идти на 1 или 2 адрес, за посылкой может идти какое-либо сообщение, оно будет нормально отображаться на экране.
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