TYPHOON800 rfsolutions.ltd, TYPHOON800 Datasheet - Page 10

• Manufacturer Part Number: TYPHOON800
• Description: Rs232/485 Radio Modem
• Manufacturer: rfsolutions.ltd

DS510-1 Aug 2008
'ATP’:
3.2 Transparent Mode
3.3 Addressed Secured mode
'ATR’:
This is the default operating mode.
Data is transferred transparently, without encapsulation, flow control or addressing. I.e. all data sent
onto the serial port by the host is transmitted across the radio link by the RF modem and will be
intercepted by any similarly configured modems.
In this mode the RF modem appears as a wireless serial point-to-point link, reproducing the function of a
half duplex serial cable
It can also be configured to scan the radio link for activity and verify it is free before transmission (listen
before talk) thereby avoiding data collisions.
This is a simplified multipoint network protocol where a network of modems allows one modem to
communicate with any other. All data transfers are encapsulated, addressed and have flow control (i.e.
frames are checked using CRC then acknowledged).
This mode’s purpose is to offer optimal radio link quality with secure data transfer and as such includes
an address field so that it is possible to address a particular modem within a network. Key points are as
follows:
Example: "1=Hello" sends the data frame "Hello" to modem with address 1
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Data transmissions are fully «data verified»
The modem acts as in transparent mode, adding frame encapsulation
Each modem has an address
Identification of a particular modem is enabled by adding that modems “address” at the
beginning of each data frame
Maximum number of modems per network = 255
Maximum number of networks = 255
The modem with address ‘1’ recognises the client transmitting modem by the number starting
the data frame.
Hayes registers reset to default values
This command allows the user to reset ALL the stored EEPROM registers to their default
values (see section 2.9 for register descriptions)
Switch to Stand-by mode
This command allows the user to switch to stand-by mode. The modem is in normal
mode by default. The modem switches back to normal node with a character reception
from the serial link
RS232/485 R
6
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©2008 Reg. No. 227 4001, ENGLAND
ADIO
M
ODEM
Page 10
TYPHOON 800