Справочник Пользователя для Nautilus International Control & Engineering Ltd NRM-900-1
User Manual
(2009)
Rev
1.0
Page 5 of 6
19/11/09
Nautilus International Control & Engineering Ltd.
Due to digital nature of operation, the module is not capable of producing over-modulation or
excessive output power if these limits are violated, but it may be damaged and/or become
inoperative.
Maximum clock frequency of the SPI bus is 6.0MHz.
Input impedance of the digital inputs is >1MOhm. Output impedance of the digital outputs is
<100Ohm. Inputs are not allowed to float and must be properly driven by the host system at
all times.
excessive output power if these limits are violated, but it may be damaged and/or become
inoperative.
Maximum clock frequency of the SPI bus is 6.0MHz.
Input impedance of the digital inputs is >1MOhm. Output impedance of the digital outputs is
<100Ohm. Inputs are not allowed to float and must be properly driven by the host system at
all times.
2.2.3 RF
Specifications
When installed into a Nautilus host system and properly programmed, the module shall
provide the following RF parameters.
provide the following RF parameters.
Parameter Min
Nom
Max
Frequency range, MHz
902.6
927.4
Channel spacing, kHz
400
Output power, dBm
9.0
10.0
12.0
Modulation bandwidth, kHz
500
Data rate, kbps
250
RX sensitivity for 1% BER
-95
2.2.4 External
connections
The module has two 6-pin single-row connectors for power and control signals and one
reverse-polarity SMA connector for the antenna. The module must be used only with the
approved type of antenna. Antenna gain must not exceed 3dBi, otherwise operation may
invalidate module’s approval.
Pin functions are given in the following table:
reverse-polarity SMA connector for the antenna. The module must be used only with the
approved type of antenna. Antenna gain must not exceed 3dBi, otherwise operation may
invalidate module’s approval.
Pin functions are given in the following table:
Pin #
Pin function
J1.1 GND
J1.2
J1.2
SPI MOSI – Data input to the module
J1.3
SPI SCK – Serial clock input to the module
J1.4
SPI MOSI – Data output from the module
J1.5
GDO2 – Status output from the module
J1.6 GND
J2.1
J2.1
+3VDC power input to the module
J2.2 GND
J2.3 GND
J2.4
J2.3 GND
J2.4
SPI CS – Module select input
J2.5
GDO0 – Status output from the module
J2.6 GND
2.2.5 Operating
conditions
The module must be installed in the host system providing protection against adverse
environmental factors, e.g. water and dust ingress.
The host system’s mechanical design shall ensure that no connection except described in
p.2.2.4 can be made to the module, either accidentally or intentionally.
environmental factors, e.g. water and dust ingress.
The host system’s mechanical design shall ensure that no connection except described in
p.2.2.4 can be made to the module, either accidentally or intentionally.