V i t a l W e l l E l e c t r o n i c s P t e L t d
w w w . v i t a l - w e l l . c o m
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CHAPTER V ADDRESSED MODE
The addressed mode is similar to a multipoint mode. All modems can
communicate with each other by addressing each frame to one of them.
V.1 Operation
Addressed mode
’
s purpose is to offer an optimal radio link performance providing
the multipoint access of the transparent mode.
Compared to the transparent mode, the addressed mode therefore includes the
additional feature to address each data frame to a specific modem.
When enabled, the modem can identifie the clients with a specific number added
at the beginning of each data frame. For example: "1=Hello" sends the data
frame "Hello" to Client 1.
The address header can be omitted by setting the address_at_the_header
control register S127 to 0 (ATS127=0). Then all of the data frames will be sent to
the default address (register S123). This is useful when in a server-client
configuration; all clients set the default address to their server address. For
example, when S127=0, S123=1,
“
Hello
”
sends the data frame
“
Hello
”
to server 1.
Receiver client recognizes the Client transmitting modem by decoding the data
frame and send the data frame to its serial link. When enabled, the modems can
inform the hosts with a specific number added at the beginning of each data
frame received. For example: "2=Hello" indicates that data frame "Hello" comes
from Client 2.
The software flow control (Xon/Xoff) can be enabled (ATS101=1) on its serial link.
V.2 Examples - Configuration with AT commands
User
+++
// Switch to Configuration mode
Modem
>
User
ATS120=192.168<CR>
// Set network ID to 192.168
Modem
>
User
ATS121=10<CR>
// set device id to 10
Modem
>
User
ATS122=11<CR>
// set default destination id to 11
Modem
>
User
ATS124=2<CR>
// Addressed mode
Modem
>
User
ATS126=0<CR>
// no address header, data will be sent to the default
Modem
>
User
ATO<CR>
// Switch to operating mode
Modem
Good Bye!
