RF620T
RF620R
SmartRadio Transmitter / Receiver
Telemetry Mode (mode pin pulled low via 10K resistor)
Operating mode
The status of the RF620T’s two logic level telemetry inputs will be mirrored on the two telemetry
outputs on the RF620R.
The input states are transmitted:
•
•
•
At power up
Every 2 seconds
After any change of state
Learn/erase procedure
In systems where only one pair of RF600T and RF600R modules is used, no learn is necessary.
In the event that more than one RF600T is in range of an RF600R then the RF620R will receive
transmissions from all in-range RF620T modules, controlling its telemetry channels in response to
all received data packets. In this case it will normally be necessary for each RF600R to learn the
identity of a single RF600T and this can be carried out in the following manner.
RF620T: the learn button is pressed, the learn LED will come on and remain on when the button
is released. The unit will transmit a learn packet and the LED will be turned off. After 5 seconds
another learn packet will be transmitted and the LED will be turned on. Every 5 seconds there-
after a learn packet will be transmitted and the LED state reversed and this will continue until 20
learn packets have been transmitted.
RF620R: the learn button is pressed, the learn LED will come on and remain on when the button
is released. When a learn packet from an RF620T is received, the RF620T address will be saved
to eeprom in the RF620R and the LED will flash 5 times to indicate that the learn has been
successful. The mode will terminate after 60 seconds if no learn packet is received.
If it is required to erase the learned address in the RF620R then the learn button should be
pressed and held for more than 8 seconds and then released after which time the LED will flash
rapidly to indicate that erase of the address has taken place. Note that in this state the RF620R
will respond to any RF600T.
DS620-3 Jan ‘07
©2007 Reg. No. 227 4001, ENGLAND
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