ER400RS EASY RADIO, ER400RS Datasheet - Page 13

• Manufacturer Part Number: ER400RS
• Description: MODULE, RX, FM, 433MHZ
• Manufacturer: EASY RADIO

Specifications of ER400RS

• External Depth: 4mm
• External Length / Height: 14mm
• External Width: 37mm
• Frequency: 433MHz
• Operating Temperature Max: 65°C
• Operating Temperature Min: -20°C
• Rf Sensitivity: -105dBm
• Range: 250m

Notes
RSSI Output
The Receiver/Transceiver has a built in RSSI (Received Signal Strength Indicator) that provides an analogue
output voltage that is inversely proportional to the RF energy present within the pass band of the receiver. It
ranges from 0 Volt (maximum signal, –50dBm) to 1.2 Volts (minimum signal, -105bBm) and has a slope of
approximately 50dB/Volt. This analogue output signal should only be connected to a high impedance load
(>100k Ohms) and can be used to provide a measure of the signal strength and any interfering signals
(noise) within band during the installation and operation of systems.
Application Notes
MAX232 Application
Compatibility
The ER400TS, ER400RS & ER400TRS use crystal controlled synthesisers to accurately define transmit and
receive frequencies incorporating RS232 protocols, and so should not be used in connection with Non-Easy
Radio RF modules.
Encoding/Decoding
Easy-Radio technology allows the transport of simple encoder/decoder code formats or more sophisticated
schemes. Please contact sales/applications for further technical advice.
LPRS Data Sheet
Easy -Radio ER400TS, ER400RS & ER400TRS 1-1.doc
DATA OUT
HOST RDY
Article I.
Antenna
DATA IN
RF GND
RSSI
BUSY
ANT
VCC
GND
Host Ready Tied Low
1
2
3
4
5
6
7
8
9
100n
+5V
Easy -Radio ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
1.3
1.2
1.1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1
0
-105
1
2
3
4
5
6
7
8
Figure 11 MAX232 Application Circuit
-100
C1+
V+
C1-
C2+
C2-
V-
T2OUT
R2IN
MAX232
-95
Figure 10 RSSI Output
T1OUT
R1OUT
R2OUT
R1IN
T1IN
T2IN
-90
VCC
GND
-85
16
15
14
13
12
11
10
9
433MHz
-80
dBm
Copyright LPRS 2003. March2004
-75
100n
-70
100n
-65
-60
VO
7805
-55
G
N
D
VI
-50
100n
Vin = 8-12V DC
0 Volt
1
6
2
7
3
8
4
9
5
1N4148
PC AT
DCD
DSR
RXD
RTS
TXD
CTS
DTR
RI
GND
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