RS232 R
ADIO
M
ODEM
232C-868FR1
In «Transparent Secured Mode», a time-out is defined to indicate the end of a frame. This time-out is a
programmable parameter (Register S214) separating each frame from the next one.
2.1.3
Flow control
Two types of flow control are available:
•
Hardware: CTS/RTS (the modem manages RTS signal only).
•
None
Register S216 can be used to program this parameter:
•
'0' stands for hardware flow control.
•
'2' indicates no flow control.
2.1.4
Addressed Secured Mode
The Addressed Secured Mode is similar to a client/server network mode, the difference is that there is
no server and all clients can communicate with each other.
Addressed secured mode’s purpose is to offer an optimal radio link quality and to provide transparent
mode with the security of the secured mode. This transparent addressed secured mode includes the
additional feature to use an address field to address one particular client.
Data Management is as follows:
•
Data transmissions are fully «Data Verified».
•
The modem acts as in transparent mode, adding frame encapsulation.
•
Identification of clients with a specific number added at the beginning of each data frame.
Example: "1=Hello" sends the data frame "Hello" to Client No.1.
•
The receiver client recognises the client transmitting modem by the number starting the data
frame.
Example: "002=Hello" indicates that data frame "Hello" comes from Client No.2.
o
DS232-4 June ’04
©2004 Reg. No. 227 4001, ENGLAND
Page 6
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