ER900TS EASY RADIO, ER900TS Datasheet - Page 23

• Manufacturer Part Number: ER900TS
• Description: MODULE, TX, FM, 860-920MHZ
• Manufacturer: EASY RADIO

Specifications of ER900TS

• External Depth: 3.8mm
• External Length / Height: 12.5mm
• External Width: 32mm
• Frequency: 868MHz
• Operating Temperature Max: 65°C
• Operating Temperature Min: -20°C
• Output Power: 10mW
• Range: 150m

ISSUE 3
(LPRS ERRATA-003.pdf)
This Errata sheet applies to all ER4/900TRS-02
modules up to and including firmware V2.01.5
ISSUE:
Radio appears to stop responding after an
undefined period.
DESCRIPTION:
When a host device is dependant on receiving a
signal from another remote unit before
transmitting and usually when a lot of data is
being exchanged (ie multiple transmissions &
receptions per second over long periods),
occasionally the PLL may not lock in frequency
when returning to RX mode after a transmission.
In our tests this may only happen after thousands
of exchanges, typically above 5000, although this
number is not definitive.
Work Around:
1)
Send the command:
After the final “ACK“ the module will return a two-
byte ASCII number. E.g. 83.
The ‘3’ is the important number. Any other number
will show the PLL is not locked and needs to be
reset.
Either:
2)
condition, you may be able to detect (through
timeouts in your own software etc) that a problem
has occurred, and perform one of the resolutions
as described in 1).
This issue will be resolved in the next firmware
revision (V2.01.6 & above)
LPRS Data Sheet
ERx00-02 Series V2.3
iii.
ii.
i.
Test for a lock condition:
ER_CMD#L30D?
Send a ‘Dummy’ transmission. This will
force the RX to reset again after the
transmission.
Send a channel update (eg. ER_CMD#C7
etc)
Reset Module through a power on reset
If you do not wish to test for a lock
Datasheet Revision 2.3 Sept 2005
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Easy-Radio ‘02’ (2
Copyright LPRS 2005.
nd
Generation Modules)
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