OG STD-302N-R-335M

OG STD-302N-R-335M
OPERATION GUIDE
UHF Narrow band radio transceiver
STD-302N-R
335 MHz
Operation Guide
Version 1.0 (July 2010)
CIRCUIT DESIGN, INC.,
7557-1 Hotaka, Azumino-city,
Nagano 399-8303 JAPAN
Tel: + +81-(0)263-82-1024
Fax: + +81-(0)263-82-1016
e-mail: [email protected]
http://www.circuitdesign.jp
OG_STD-302N-R-335M_v10e
OPERATION GUIDE
CONTENTS
GENERAL DESCRIPTION & FEATURES...........................3
SPECIFICATIONS
STD-302N-R 335 MHz.......................4
PIN DESCRIPTION .............................................................6
BLOCK DIAGRAM...............................................................8
DIMENSIONS......................................................................9
PLL IC CONTROL .............................................................10
PLL IC control ..................................................................10
How to calculate the setting values for the PLL register ........ 11
Method of serial data input to the PLL ................................12
TIMING CHART.................................................................13
PLL FREQUENCY SETTING REFERENCE .....................15
REGULATORY COMPLIANCE INFORMATION................16
CAUTIONS & WARNINGS................................................17
REVISION HISTORY.........................................................18
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OPERATION GUIDE
GENERAL DESCRIPTION & FEATURES
General Description
The UHF FM narrow band semi-duplex radio data module STD-302N-R is a high performance
transceiver designed for use in industrial applications requiring long range, high performance and
reliability.
All high frequency circuits are enclosed inside a robust housing to provide superior resistance
against shock and vibration. A narrow band technique enables high interference rejection and
concurrent operation with multiple modules.
STD-302N-R, a narrowband module with 25 kHz channel steps, achieves high TX/RX switching
speed, making it an ideal RF unit for inclusion in feedback systems.
Features





1 mW RF power, 3.0 V operation
Programmable RF channel
Fast TX/RX switching time
High sensitivity -120 dBm
Excellent mechanical durability, high vibration & shock resistance
Applications

Telemetry
Water level monitor for rivers, dams, etc.
Monitoring systems for environmental data such as temperature, humidity, etc.
Transmission of measurement data (pressure, revolution, current, etc) to PC
Security alarm monitoring
 Telecontrol
Industrial remote control systems
Remote control systems for factory automation machines
Control of various driving motors
 Data transmission
RS232/RS485 serial data transmission
Note: In India, license-exempt application allocated in the 335 MHz band is only remote control
systems of cranes.
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OPERATION GUIDE
SPECIFICATIONS
STD-302N-R 335 MHz
* The MIN/TYP/MAX values for the RF output power and BER are specified in the range of operation environment temperature.
* All values in the Specification column are specified at 25 ºC+/-10 ºC unless otherwise noted.
General characteristics
Item
Communication method
Emission class
Operating frequency range
Operation temperature range
Storage temperature range
Aging rate ( / year)
Initial frequency tolerance *
Dimensions
Weight
Units
MHz
°C
°C
ppm
ppm
mm
g
MIN
TYP
MAX
One way, Half-duplex
F1D
335.7125
335.8375
-20
60
-30
75
-1
1
-1.5
1.5
30 x 50 x 9 mm
25 g
Remarks
No dew condensation
No dew condensation
TX freq., RX Lo freq.
TX freq., RX Lo freq. At delivery
Not including protrusion
* Initial frequency tolerance: At delivery
Initial frequency tolerance is defined as frequency drift at delivery within 1 year after the final adjustment
Electrical specification <Common>
Item
Oscillation type
Frequency stability (-20 to 60°C)
TX/RX switching time
Channel step
Data rate
Max. pulse width
Min. pulse width
Data polarity
PLL reference frequency
PLL response
Antenna impedance
Operating voltage
TX consumption current
RX consumption current
ppm
ms
kHz
bps
ms
us
MHz
ms
Ω
V
mA
mA
MIN
TYP
MAX
PLL controlled VCO
-4
4
15
20
25
2400
4800
15
20
200
Positive
21.25
30
60
50
3.0
5.5
38
42
26
30
Remarks
Reference frequency at 25 °C
DI/DO
DO/DI
DO/DI
DO/DI
DO/DI
TCXO
from PLL setting to LD out
Nominal
Vcc = 3.0 V
Vcc = 3.0 V
For the PLL interface, refer to the documents of MB15E03SLP (FUJITSU) and use it within the specifications
Transmitter part
Item
RF output power
Deviation
DI input level
Residual FM noise
Spurious emission
Adjacent CH power
Occupied bandwidth
OG_STD-302N-R335M_v10e
mW
kHz
V
kHz
dBm
dBm
kHz
MIN
0.5
+/- 2.1
0
-
TYP
1
+/- 2.4
MAX
3
+/- 2.7
5.5
0.17
-54
-37
10
4
Remarks
Conducted 50 Ω
PN9 4800 bps
L= GND, H = 3 V- Vcc
DI=L, LPF=20 kHz
Conducted 50Ω
PN9 4800 bps CH25 kHz/BW 10 kHz
PN9 4800 bps
Circuit Design, Inc.
OPERATION GUIDE
Receiver part
Item
Receiver type
1st IF frequency
2nd IF frequency
Maximum input level
*1
BER (0 error/2556 bits)
*2
BER (1 % error)
Sensitivity 12dB/ SINAD
Spurious response rejections
Adjacent CH selectivity
dB
84
MHz
kHz
dBm
dBm
dBm
dBm
*3
*3
Blocking
Intermodulation
DO output level
dB
MIN
TYP
MAX
Double superheterodyne
21.7
450
10
-108
-117
-120
-120
70
55
50
*4
dB
dB
V
RSSI rising time
50
0
ms
Time until valid Data-out
*5
st
ms
Spurious radiation (1 Lo)
dBm
RSSI
mV
300
190
30
50
50
70
-57
360
250
2.8
50
100
70
120
420
310
Remarks
PN 9 4800 bps
PN 9 4800 bps
fm1 k/ dev 2 kHz CCITT
1 st Mix, 2 signal method, 1 % error
2 nd Mix, 2 signal method, 1 % error
+/- 25 kHz, 2 signal method, 1 % error
Jamming signal +/- 1MHz,
2 signal method, 1% error
2 signal method, 1 % error
L = GND H = 2.8 V
CH shift of 25 kHz (from PLL setup)
When power ON (from PLL setup)
CH shift of 25 kHz (from PLL setup)
When power ON (from PLL setup)
Conducted 50 Ω
With -97 dBm at 335.7875 MHz
With -113 dBm at 335.7875 MHz
Specifications are subject to change without prior notice
Notice
 Communication range depends on the operation environment and ambient surrounding
 Specifications are subject to change to improve the characteristics and for other reasons.
 The time required until a stable DO is established may get longer due to the possible frequency drift
caused by operation environment changes, especially when switching from TX to RX, from RX to TX and
changing channels. Please make sure to optimize the timing. The recommended preamble is more than
20 ms.
 Antenna connection is designed as pin connection. RF output power, sensitivity, spurious emission and
spurious radiation levels may vary with the pattern used between the RF pin and the coaxial connection.
Please make sure to verify those parameters before use.
 The feet of the shield case should be soldered to the wide GND pattern to avoid any change in
characteristics.
Notes about the specification values
*1 BER: RF level where no error per 2556 bits is confirmed with the signal of PN9 and 4800 bps.
*2 BER (1 % error): RF level where 1% error per 2556 bits is confirmed with the signal of PN9 and 4800 bps.
*3 Spurious response, CH selectivity, Blocking: Jamming signal used in the measurement is unmodulated.
*4 Intermodulation: Ratio between the receiver input level with BER 1% and the signal level (PN9 4800 bps)
added at the points of 'Receiving frequency - 200 kHz ' + ' Receiving frequency -100kHz' with which BER 1%
is achieved.
*5 Time until valid Data-out: Valid DO is determined at the point where Bit Error Rate meter starts detecting
the signal of 4800 bps, 1010 repeated signal.
All specifications are specified based on the data measured in a shield room using the PLL setting controller
board prepared by Circuit Design.
Measuring equipment:
SG=ANRITSU communication analyzer MT2605
Spectrum analyzer = ANRITSU MS2663G / BER measure = ANRITSU MP1201G
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OPERATION GUIDE
PIN DESCRIPTION
Pin name
I/O
Description
RF input terminal
Antenna impedance nominal 50 Ω
Equivalent circuit
47P
SAW FILTER
RF
RF
I/O
100nH
GND
GND
I
GROUND terminal
The GND pins and the feet of the shield case
shoud be connected to the wide GND
pattern.
Power supply terminal
DC 3.0 to 5.5 V
VCC
TXSEL
RXSEL
AF
VCC
2.8V
I
I
I
I
22µ
TX select terminal
GND = TXSEL active
To enable the transmitter circuits, connect
TXSEL to GND and RXSEL to OPEN or 2.8
V.
RX select terminal
GND= RXSEL active
To enable the receiver circuits, connect
RXSEL to GND and TXSEL to OPEN or 2.8
V.
10µ
47P
47P
2.8V
10
20K
2.8V
TXSEL
2.8V
10
20K
2.8V
RXSEL
Analogue output terminal
There is DC offset of approx. 1 V.
Refer to the specification table for amplitude
level.
PLL data setting input terminal
Interface voltage H = 2.8 V, L = 0 V
CLK
REG
2K
CLK
2K
DATA
2K
LE
MB15E03
I
PLL data setting input terminal
Interface voltage H = 2.8 V, L = 0 V
MB15E03
DATA
LE
I
I
PLL data setting input terminal
Interface voltage H = 2.8 V, L = 0 V
OG_STD-302N-R335M_v10e
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MB15E03
Circuit Design, Inc.
OPERATION GUIDE
PLL lock/unlock monitor terminal
Lock = H (2.8 V), Unlock = L (0 V)
LD
O
2.8V
2K
LD
MB15E03
102
Received Signal Strength Indicator terminal
RSSI
O
Data output terminal
Interface voltage: H=2.8V, L=0V
DO
O
2.8V
10K
2K
DO
102
DI
I
Data input terminal
Interface voltage: H=2.8V to Vcc, L=0V
Input data pulse width Min. 100 μs Max. 15
ms
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Circuit Design, Inc.
OPERATION GUIDE
BLOCK DIAGRAM
<STD-302N-R 335 MHz>
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OPERATION GUIDE
DIMENSIONS
RF
GND
VCC
TXSEL
RXSEL
AFOUT
CLK
DATA
LE
LD
RSSI
DO
DI
STD-302N-R
335MHz
00000000
RSSI
MADE IN JAPAN
Reference hole position for PCB
mounting(Top view)
OG_STD-302N-R-335M_v10e
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Circuit Design, Inc.
OPERATION GUIDE
PLL IC CONTROL

PLL IC control
Figure 1
up to 1200MHz
VCO
2kohm
Voltage Controled
Oscillator
Fin
CLK
Xf in
Data
2kohm
2kohm
GND
LPF
LE
PLL
Do
+2.8v
LE
PS
VCC
ZC
2kohm
21.25MHz
DATA
MB15E03SL
Vp
Reference Oscillator
CLK
LD/f out
OSCout
P
OSCin
R
LD
STD-302
Control pin name
#:Control v oltage = +2.8v
STD-302N-R is equipped with an internal PLL frequency synthesizer as shown in Figure 1. The operation of
the PLL circuit enables the VCO to oscillate at a stable frequency. Transmission frequency is set externally by
the controlling IC. STD-302N-R has control terminals (CLK, LE, DATA) for the PLL IC and the setting data is
sent to the internal register serially via the data line. Also STD-302N-R has a Lock Detect (LD) terminal that
shows the lock status of the frequency. These signal lines are connected directly to the PLL IC through a 2 kΩ
resistor.
The interface voltage of STD-302N-R is 2.8 V, so the control voltage must be the same.
STD-302N-R comes equipped with a Fujitsu MB15E03SL PLL IC. Please refer to the manual of the PLL IC.
The following is a supplementary description related to operation with STD-302N-R. In this description, the
same names and terminology as in the PLL IC manual are used, so please read the manual beforehand.
OG_STD-302N-R-335M_v10e
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OPERATION GUIDE

How to calculate the setting values for the PLL register
The PLL IC manual shows that the PLL frequency setting value is obtained with the following equation.
fvco = [(M x N)+A] x fosc / R
-- Equation 1
fvco : Output frequency of external VCO
M: Preset divide ratio of the prescaler (64 or 128)
N: Preset divide ratio of binary 11-bit programmable counter (3 to 2,047)
A: Preset divide ratio of binary 7-bit swallow counter (0 ≤ A ≤ 127 A<N))
fosc: Output frequency of the reference frequency oscillator
R: Preset divide ratio of binary 14-bit programmable reference counter (3 to 16,383)
With STD-302N-R, there is an offset frequency (foffset) 21.7 MHz for the transmission RF channel frequency
fch. Therefore the expected value of the frequency generated at VCO (f expect) is as below.
fvco = fexpect = fch – foffset ---- Equation 2
The PLL internal circuit compares the phase to the oscillation frequency f vco. This phase comparison
frequency (fcomp) must be decided. fcomp is made by dividing the frequency input to the PLL from the reference
frequency oscillator by reference counter R. STD-302N-R uses 21.25 MHz for the reference clock f osc. fcomp is
one of 6.25 kHz, 12.5 kHz or 25 kHz.
The above equation 1 results in the following with n = M x N + A, where “n” is the number for division.
fvco=n*fcomp ---- Equation 3
n = fvco/fcomp ---- Equation 4 note: fcomp = fosc/R
Also, this PLL IC operates with the following R, N, A and M relational expressions.
R=fosc/fcomp ---- Equation 5
N = INT (n / M) ---- Equation 6
A = n - (M x N) ---- Equation 7
INT: integer portion of a division.
As an example, the setting value of RF channel frequency fch 869.725 MHz can be calculated as below.
The constant values depend on the electronic circuits of STD-302N-R.
Conditions:
Channel center frequency:
fch = 869.725 MHz
Constant: Offset frequency:
foffset=21.7 MHz
Constant: Reference frequency:
fosc=21.25 MHz
Set 25 kHz for Phase comparison frequency and 64 for Prescaler value M
The frequency of VCO will be
fvco = fexpect = fch - foffset = 869.725 –21.7 = 848.025MHz
Dividing value “n” is derived from Equation 4
n = fvco / fcomp = 848.025MHz/25kHz = 33921
Value “R” of the reference counter is derived from Equation 5.
R = fosc/fcomp = 21.25MHz/25kHz = 850
Value “N” of the programmable counter is derived from Equation 6.
N = INT (n/M) = INT(33921/64) = 530
Value “A“ of the swallow counter is derived from Equation 7.
A = n – (M x N) = 33921 – 64 x 530 = 1
The frequency of STD-302N-R is locked at a center frequency f ch by inputting the PLL setting values N, A and
R obtained with the above equations as serial data. The above calculations are the same for the other
frequencies.
Excel sheets that contain automatic calculations for the above equations can be found on our web site
(www.circuitdesign.jp/eng/).
The result of the calculations is arranged as a table in the CPU ROM. The table is read by the channel
change routine each time the channel is changed, and the data is sent to the PLL.
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OPERATION GUIDE

Method of serial data input to the PLL
After the RF channel table plan is decided, the data needs to be allocated to the ROM table and read from
there or calculated with the software.
Together with this setting data, operation bits that decide operation of the PLL must be sent to the PLL.
The operation bits for setting the PLL are as follows. These values are placed at the head of the reference
counter value and are sent to the PLL.
1.
CS: Charge pump current select bit
CS = 0
+/-1.5 mA select
VCO is optimized to +/-1.5 mA
2.
LDS: LD/fout output setting bit
LDS = 0
LD select
Hardware is set to LD output
3.
FC: Phase control bit for the phase comparator
FC = 1
Hardware operates at this phase
Figure 2
1st Data
2nd Data
2nd data
N11
N10
N9
N8
N7
N6
1st data
CS
LDS
FC
SW
R14
R13
A1
R1
CNT=0
CNT=1
Inv alid Data
DATA
MSB
LSB
CLK
t1
t2
t6
t3
t0
LE
STD-302
terminal name
#: t0,t5 >= 100 ns
t1,t2,t6 >= 20 ns
t3,t4 >= 30 ns
t4
t5
#: Keep the LE terminal at a low level, w hen w rite the data to the shift resister.
The PLL IC, which operates as shown in the block diagram in the manual, shifts the data to the 19-bit shift
register and then transfers it to the respective latch (counter, register) by judging the CNT control bit value
input at the end.
1. CLK [Clock]: Data is shifted into the shift register on the rising edge of this clock.
2. LE [Load Enable]: Data in the 19-bit shift register is transferred to respective latches on the rising edge of
the clock. The data is transferred to a latch according to the control bit CNT value.
3. Data [Serial Data]: You can perform either reference counter setup or programmable counter setup first.
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OPERATION GUIDE
TIMING CHART
Control timing in a typical application is shown in Figure 3.
Initial setting of the port connected to the radio module is performed when power is supplied by the CPU and
reset is completed. MOS-FET for supply voltage control of the radio module, RXSEL and TXSEL are set to
inactive to avoid unwanted emissions. The power supply of the radio module is then turned on. When the
radio module is turned on, the PLL internal resistor is not yet set and the peripheral VCO circuit is unstable.
Therefore data transmission and reception is possible 40 ms after the setting data is sent to the PLL at the
first change of channel, however from the second change of channel, the circuit stabilizes within 20 ms and is
able to handle the data.
Changing channels must be carried out in the receive mode. If switching is performed in transmission mode,
unwanted emission occurs.
If the module is switched to the receive mode when operating in the same channel, (a new PLL setting is not
necessary) it can receive data within 5 ms of switching*1. For data transmission, if the RF channel to be used
for transmission is set while still in receiving mode, data can be sent at 5 ms after the radio module is
switched from reception to transmission*2.
Check that the Lock Detect signal is “high” 20 ms after the channel is changed. In some cases the Lock
Detect signal becomes unstable before the lock is correctly detected, so it is necessary to note if processing
of the signal is interrupted. It is recommended to observe the actual waveform before writing the process
program.
*1
DC offset may occur due to frequency drift caused by ambient temperature change. Under conditions
below -10 °C, 10 to 20 ms delay of DO output is estimated. The customer is urged to verify operation at low
temperature and optimize the timing.
*2
Sending ‘10101…..’ preamble just after switching to transmission mode enables smoother operation of the
binarization circuit of the receiver.
For 4800 bps, a preamble of ‘11001100’ is effective.
Recommended preamble length:
- 20 °C - + 60 °C : 20 ms
Remark
For details about PLL control and the sample programs, see our technical document ‘STD-302 interface
method’
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Circuit Design, Inc.
OPERATION GUIDE
Figure 3: Timing diagram for STD-302
Status immediately after pow er comes on.
Normal status
Channel change
No channel change
CPU
Pow er on
STD-302
Pow er on
#:3
Receiv e mode
Receiv e mode
Receiv e mode
activ e period
activ e period
activ e period
Activ e period
RXSEL
CPU control,
CH change
&
Data rec.
Timing
#:1
#:2
#:4
5 ms
#:4
CH
Data #:5
CH
#:4
Data #:6
Check LD signal
Check LD signal
CH
Data #:7
Check LD signal
LD
40 ms
10 to 20 ms
Transmit mode
activ e
TXSEL
Transmit mode
activ e
Transmit mode
activ e
Data transmit
5 ms
5 ms
#:1 Reset control CPU
5 ms
#:5 40 ms later, the receiver can receive the data after changing the channel..
#:2 Initialize the port connected to the module.
#:6 10 to 20 ms later, the receiver can receive the data after changing the channel.
#:3 Supply pow er to the module after initializing CPU.
#:7 5 ms later, the data can be received if the RF channel is not changed.
#:4 RFchannel change must be performed in receiving mode.
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Circuit Design, Inc.
OPERATION GUIDE
PLL FREQUENCY SETTING DATA REFERENCE
335 MHz band (335.7125 – 335.8375 MHz)
Parameter name
Value
Phase Comparing Frequency Fcomp [kHz]
Start Channel Frequency Fch [MHz]
Channel Step Frequency [kHz]
Number of Channel
Prescaler M
25
335.7125
25
6
64
Parameter name
Reference Frequency Fosc [MHz]
Offset Frequency Foffset [MHz]
Value
21.25
21.7
No.
Channel Frequency
FCH
0
1
2
3
4
5
(MHz)
335.7125
335.7375
335.7625
335.7875
335.8125
335.8375
OG_STD-302N-R-335M_v10e
Expect
Frequency
FEXPECT
(MHz)
314.0125
314.0375
314.0625
314.0875
314.1125
314.1375
: For data input
: Result of calculation
: Fixed value
Parameter name
Reference Counter R
Programmable Counter N Min. Value
Programmable Counter N Max. Value
Swallow Counter A Min. Value
Swallow Counter A Max. Value
Lock
Frequency
FVCO
(MHz)
314.0000
314.0250
314.0500
314.0750
314.1000
314.1250
15
Value
850
196
196
16
21
Number of
Division n
Programmable
Counter N
Swallow
Counter A
12560
12561
12562
12563
12564
12565
196
196
196
196
196
196
16
17
18
19
20
21
Circuit Design, Inc.
OPERATION GUIDE
Regulatory compliance information
Compliance
STD-302N-R 335 MHz was designed to be installed in remote control systems used for cranes in India. The
technical specifications referred to in the design phase are shown below:
Frequency
335.7125, 335.7375, 335.7625, 335.7875, 335.8125, 335.8375 MHz
Output power
< 1 mW
Band width
< 10 kHz
The relevant laws and regulations are subject to change.
Compliance assessment
This product was designed to meet the specification above, however it has not been assessed for conformity with
the appropriate regulations. Users are required to verify that their final product meets the appropriate specifications
and to perform the procedures for regulatory compliance.
Guarantee of regulatory compliance
We only guarantee that this product meets the specification in this document. We are exempt from any other
responsibilities relating to regulatory compliance.
We also recommend that the user consults the authorities in the relevant country for detailed regulatory information
such as valid regulations, test specifications, assessment procedures, marking methods etc, before starting any
project with this product.
If technical documentation is required for compliance assessments, we will provide any documents, which may be
considered necessary for assessment, under NDA. The documentation is only available in English.
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OPERATION GUIDE
Important notice

Customers are advised to consult with Circuit Design sales representatives before ordering.
Circuit Design believes the provided information is accurate and reliable. However, Circuit Design reserves the
right to make changes to this product without notice.
 Circuit Design products are neither designed nor intended for use in life support applications where malfunction
can reasonably be expected to result in significant personal injury to the user. Any use of Circuit Design products
in such safety-critical applications is understood to be fully at the risk of the customer and the customer must fully
indemnify Circuit Design, Inc for any damages resulting from any improper use.
 As the radio module communicates using electronic radio waves, there are cases where transmission will be
temporarily cut off due to the surrounding environment and method of usage. The manufacturer is exempt from
all responsibility relating to resulting harm to personnel or equipment and other secondary damage.
 The manufacturer is exempt from all responsibility relating to secondary damage resulting from the op eration,
performance and reliability of equipment connected to the radio module.
Copyright
 All rights in this operation guide are owned by Circuit Design, Inc. No part of this document may be copied or
distributed in part or in whole without the prior written consent of Circuit Design, Inc.
Cautions
 Do not use the equipment within the vicinity of devices that may malfunction as a result of electronic radio waves
from the radio module.
 Communication performance will be affected by the surrounding environment, so communication tests should be
carried out before actual use.
 Ensure that the power supply for the radio module is within the specified rating. Short circuits and reverse
connections may result in overheating and damage and must be avoided at all costs.
 Ensure that the power supply has been switched off before attempting any wiring work.
 The case is connected to the GND terminal of the internal circuit, so do not make contact between the '+' side of
the power supply terminal and the case.
 When batteries are used as the power source, avoid short circuits, recharging, dismantling, and pressure. Failure
to observe this caution may result in the outbreak of fire, overheating and damage to the equipment. Remove the
batteries when the equipment is not to be used for a long period of time. Failure to observe this caution may
result in battery leaks and damage to the equipment.
 Do not use this equipment in vehicles with the windows closed, in locations where it is subject to direct sunlight,
or in locations with extremely high humidity.
 The radio module is neither waterproof nor splash proof. Ensure that it is not splashed with soot or water. Do not
use the equipment if water or other foreign matter has entered the case.
 Do not drop the radio module or otherwise subject it to strong shocks.
 Do not subject the equipment to condensation (including moving it from cold locations to locations with a
significant increase in temperature.)
 Do not use the equipment in locations where it is likely to be affected by acid, alkalis, organic agents or corrosive
gas.
 Do not bend or break the antenna. Metallic objects placed in the vicinity of the antenna will have a great effect on
communication performance. As far as possible, ensure that the equipment is placed well away from metallic
objects.
 The GND for the radio module will also affect communication performance. If possible, ensure that the case GND
and the circuit GND are connected to a large GND pattern.
Warnings
 Do not take apart or modify the equipment.
 Do not remove the product label (the label attached to the upper surface of the module.) Using a module from
which the label has been removed is prohibited.
Copyright 2010, Circuit Design, Inc.
OG_STD-302N-R-335M_v10e
17
Circuit Design, Inc.
OPERATION GUIDE
REVISION HISTORY
Version
1.0
Date
July 2010
OG_STD-302N-R-335M_v10e
Description
STD-302N-R 335 MHz First issue
18
Remark
Circuit Design, Inc.
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