RF600T_03 RFSOLUTIONS [rfsolutions.ltd], RF600T_03 Datasheet - Page 3

• Manufacturer Part Number: RF600T_03
• Description: Low-Power-Radio Transceiver IC
• Manufacturer: RFSOLUTIONS [rfsolutions.ltd]

DS601-2
All message transfers are tagged with the addresses of both the origin and destination, thus ensuring secure
data transfer at all times. Either node ‘A’ or node ‘B’ can initiate a transfer but only one direction of transfer
can be active at a given time. In the event that the originating node does not get confirmation of receipt of the
data packet, the software re-tries the transfer five times after which node ‘A’ will output an error message to
the host in the form of the ASCII character ‘F’ (Failed).
Correct reception (or otherwise) of a data packet is thus acknowledged and the host devices are relieved of
most of the workload of ensuring that data transfers occur as required.
The RF600T must be configured before power up for either the broadcast or addressed mode of operation by
means of the MODE pin (6). Note that for security, broadcast nodes will not receive data from addressed
nodes.
System Operation
Each RF600T is programmed at manufacture with a 24 bit serial number which uniquely identifies the device.
In an addressed point to point system, these serial numbers are used as the device address for the nodes in
the system and non-volatile eeprom memory in the device stores the address of the ‘other’ node in the
system. If, as at time of manufacture, no address has been stored in the device or if the address has been
erased then the device will only operate in the broadcast mode. If however an address has been stored then
the device will only operate in the addressed point to point mode.
If operation in the broadcast mode is required then with a new device, no action is necessary. If a device has
been used in the point to point addressed mode or if its status is unknown then status erase must be carried
out using the following procedure.
If operation in the addressed mode is required then the following procedure has to be followed to allow the two
nodes in the system to operate together.
The LEARN pin is grounded for a period of 5 seconds and is then allowed to float. The status LED then
flashes slowly for 3 seconds to indicate that the device is erased and will now only operate in the
broadcast mode.
The two nodes, ‘A’ and ‘B’ are placed within radio range of one another are powered up.
The LEARN pin on one device – say ‘B’ is briefly taken low, placing the node into learn mode. The
LEARN/ERASE status LED on ‘B’ comes on and remains on for 20 seconds. If within this period, no
‘learn’ data packet is received (see below) then the LED will be extinguished and the device will operate
normally.
At node ‘A’, the LEARN pin is briefly taken low. The LEARN/ERASE status LED will then come on and
node ‘A’ will transmit its address.
Node ‘B’ will receive and store the address of ’A’.
Node ‘B’ sends back to node ‘A’ both its address and that of node ‘A’.
Node ‘A’ receives and stores the address of ’B’ and confirms to ‘B’ that it has received the information.
Both node ‘A’ and ‘B’ LED's flash their status LED’s rapidly for 3 seconds to show that they have
learned each others addresses.
Note: Other nodes which may be active will ignore this transfer since they have not been placed into
learn mode.
11
th
Low-Power-Radio Transceiver IC
Dec 2003
©2003 Reg. No. 227 4001, ENGLAND
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RF600T