STD-302N-R 429MHz Operation Guide

STD-302N-R 429MHz Operation Guide
OPERATION GUIDE
UHF Narrow band radio transceiver
STD-302N-R
429MHz
Operation Guide
Version 1.0 (Apr. 2008)
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-429M_v10e
OPERATION GUIDE
CONTENTS
GENERAL DESCRIPTION & FEATURES ...........................3
SPECIFICATIONS
STD-302N-R 429 MHz .......................4
PIN DESCRIPTION .............................................................5
FREQUENCY TABLE ..........................................................7
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
CAUTIONS & WARNINGS ................................................16
OG_STD-302N-R-429M_v10e
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Circuit Design, Inc.
OPERATION GUIDE
GENERAL DESCRIPTION & FEATURES
General Description
The UHF FM narrow band semi-duplex radio data module STD-302N-R is an STD-T67 compliant,
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 429MHz, a narrowband module with 12.5 kHz channel steps, achieves high TX/RX
switching speed, making it an ideal RF unit for inclusion in feedback systems.
This product is designed to meet the basic specifications of the standard, however it has not been
certified for conformity with the technical regulations. Users are required to perform the
procedures for certification with their final products after installing this product in their systems.
Features
10 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
STD-T67 compliance
EU RoHS compliance
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
OG_STD-302N-R-429M_v10e
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Circuit Design, Inc.
OPERATION GUIDE
SPECIFICATIONS
STD-302N-R 429 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
429.25
429.7375
-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
12.5
2400
4800
15
20
200
Positive
21.25
30
60
50
3.0
5.5
44
48
26
30
Remarks
Reference frequency at 25 °C
DI/DO
DO/DI
DO/DI
DO/DI
DI vs DO
TCXO
from PLL setting to LD out
Nominal
Vcc = 3.0 V
Vcc = 3.0 V
For PLL interface, refer to the documents of MB15E03SLP and use it within the specification.
Transmitter part
Item
RF output power
Deviation
DI input level
Residual FM noise
Spurious emission
Adjacent CH power
Occupied freq. bandwidth
OG_STD-302N-R-429M_v10e
mW
kHz
V
kHz
dBm
dB
kHz
MIN
5
+/- 1.7
0
TYP
9
+/- 2.0
0.17
- 37
MAX
12
+/- 2.3
5.5
- 27
40
8.5
4
Remarks
Conducted 50 Ω 429.5 MHz
PN9 4800 bps
L= GND, H = 3 V- Vcc
DI=L, LPF=20 kHz
Conducted 50Ω
PN9 4800 bps
PN9 4800 bps
Circuit Design, Inc.
OPERATION GUIDE
Receiver part
Item
Receiver type
1st IF frequency
2nd IF frequency
Maximum input level
BER (0 error/2556 bits) *1
BER (1 % error) *2
Sensitivity 12dB/ SINAD
MHz
kHz
dBm
dBm
dBm
dBm
MIN
TYP
MAX
Double superheterodyne
21.7
450
10
-108
-115
-120
-120
70
55
Spurious response rejections*3
dB
Adjacent CH selectivity *3
dB
50
Blocking
dB
84
dB
V
50
Intermodulation
DO output level
*4
RSSI rising time
ms
Time until valid Data-out *5
ms
Spurious radiation (1st Lo)
dBm
RSSI
mV
0
300
190
30
50
50
70
-60
350
240
2.8
50
70
100
120
-54
400
290
Remarks
PN 9 4800bps
PN 9 4800bps
fm1 k/ dev 2 kHz CCITT
1 st Mix, 2 signal method, 1 % error
2 nd Mix, 2 signal method, 1 % error
+/- 12.5 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 429.5 MHz
With -113 dBm at 429.5 MHz
Specifications are subject to change without prior notice
Notice
Communication range depends on the operation environment and ambient surrounding
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: 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 4800bps, 1010 repeated signal.
Conditions:
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
OG_STD-302N-R-429M_v10e
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Circuit Design, Inc.
OPERATION GUIDE
PIN DESCRIPTION
Pin name
I/O
Description
Equivalent circuit
47P
SAW FILTER
RF
I/O
RF
RF input terminal
Antenna impedance nominal 50 Ω
100nH
GND
GND
I
GROUND terminal
The GND pins and the feet of the shield case
shoud be connected to the wide GND
pattern.
VCC
2.8V
VCC
TXSEL
RXSEL
AF
CLK
I
Power supply terminal
DC 3.0 to 5.5 V
I
TX select terminal
GND = TXSEL active
To enable the transmitter circuits, connect
TXSEL to GND and RXSEL to OPEN or 2.8
V.
REG
22µ
I
Analogue output terminal
There is DC offset of approx. 1 V.
Refer to the specification table for amplitude
level.
MB15E03
I
PLL data setting input terminal
Interface voltage H = 2.8 V, L = 0 V
MB15E03
PLL data setting input terminal
Interface voltage H = 2.8 V, L = 0 V
LE
I
PLL data setting input terminal
Interface voltage H = 2.8 V, L = 0 V
OG_STD-302N-R-429M_v10e
6
20K
TXSEL
I
I
47P
2.8V
10
2.8V
RX select terminal
GND= RXSEL active
To enable the receiver circuits, connect
RXSEL to GND and TXSEL to OPEN or 2.8
V.
DATA
10µ
47P
2.8V
10
20K
2.8V
RXSEL
2K
CLK
2K
DATA
2K
LE
MB15E03
Circuit Design, Inc.
OPERATION GUIDE
2.8V
LD
O
PLL lock/unlock monitor terminal
Lock = H (2.8 V), Unlock = L (0 V)
2K
LD
MB15E03
102
RSSI
O
Received Signal Strength Indicator terminal
2.8V
DO
DI
O
I
Data output terminal
Interface voltage: H=2.8V, L=0V
10K
2K
DO
102
Data
input
terminal
Interface voltage: H=2.8 to Vcc, L=0V
Input data pulse width Min.208 µs Max.5 ms
OG_STD-302N-R-429M_v10e
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Circuit Design, Inc.
OPERATION GUIDE
Frequency table (STD-T67)
Channel number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
OG_STD-302N-R-429M_v10e
Operating frequency (MHz)
429.1750
429.1875
429.2000
429.2125
429.2250
429.2375
429.2500
429.2625
429.2750
429.2875
429.3000
429.3125
429.3250
429.3750
429.3875
429.3625
429.3750
429.3875
429.4000
429.4125
429.4250
429.4375
429.4500
429.4625
429.4750
429.4875
429.5000
429.5125
429.5250
429.5375
429.5500
429.5625
429.5750
429.5875
429.6000
429.6125
429.6250
429.6375
429.6500
429.6625
429.6750
429.6875
429.7000
429.7125
429.7250
429.7375
8
Transmission time restriction
Transmission for 40 sec, pause for 2 sec
Continuous transmission
(Intermittent communication possible)
Circuit Design, Inc.
OPERATION GUIDE
BLOCK DIAGRAM
<STD-302N-R 429 MHz>
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OPERATION GUIDE
DIMENSIONS
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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
LE
GND
LPF
PLL
Do
+2.8v
LE
PS
ZC
2kohm
21.25MHz
DATA
MB15E03SL
VCC
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-429M_v10e
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Circuit Design, Inc.
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.
-- Equation 1
fvco = [(M x N)+A] x fosc / R
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 (fexpect) is as below.
fvco = fexpect = fch – foffset ---- Equation 2
The PLL internal circuit compares the phase to the oscillation frequency fvco. 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 fosc. 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.
n = fvco/fcomp ---- Equation 4 note: fcomp = fosc/R
fvco=n*fcomp ---- Equation 3
Also, this PLL IC operates with the following R, N, A and M relational expressions.
N = INT (n / M) ---- Equation 6
A = n - (M x N) ---- Equation 7
R=fosc/fcomp ---- Equation 5
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 fch 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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Circuit Design, Inc.
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
A1
CNT=0
1st data
CS
LDS
FC
SW
R14
R13
R1
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.
OG_STD-302N-R-429M_v10e
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Circuit Design, Inc.
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 ms
Remark
For details about PLL control and the sample programs, see our technical document ‘STD-302 interface
method’
OG_STD-302N-R-429M_v10e
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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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OPERATION GUIDE
PLL FREQUENCY SETTING DATA REFERENCE
STD-302N-R PLL setting reference
429MHz band (429.1750 – 429.7375 MHz)
Parameter name
Phase Comparing Frequency FCOMP [kHz]
Start Channel Frequency FCH [MHz]
Channel Step Frequency [kHz]
Number of Channel
Prescaler M
Parameter name
Value
: For data input
12.5
429.1750
12.5
46
64
: 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
Value
Reference Frequency FOSC [MHz]
Offset Frequency FOFFSET [MHz]
21.25
21.7
No.
Channel
Frequency FCH
(MHz)
Expect Frequency
F EXPECT
(MHz)
Lock Frequency
FVCO
(MHz)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
429.1750
429.1875
429.2000
429.2125
429.2250
429.2375
429.2500
429.2625
429.2750
429.2875
429.3000
429.3125
429.3250
429.3375
429.3500
429.3625
429.3750
429.3875
429.4000
429.4125
429.4250
429.4375
429.4500
429.4625
429.4750
429.4875
429.5000
429.5125
429.5250
429.5375
429.5500
429.5625
429.5750
429.5875
429.6000
429.6125
429.6250
429.6375
429.6500
429.6625
429.6750
429.6875
429.7000
429.7125
429.7250
429.7375
407.4750
407.4875
407.5000
407.5125
407.5250
407.5375
407.5500
407.5625
407.5750
407.5875
407.6000
407.6125
407.6250
407.6375
407.6500
407.6625
407.6750
407.6875
407.7000
407.7125
407.7250
407.7375
407.7500
407.7625
407.7750
407.7875
407.8000
407.8125
407.8250
407.8375
407.8500
407.8625
407.8750
407.8875
407.9000
407.9125
407.9250
407.9375
407.9500
407.9625
407.9750
407.9875
408.0000
408.0125
408.0250
408.0375
407.4750
407.4875
407.5000
407.5125
407.5250
407.5375
407.5500
407.5625
407.5750
407.5875
407.6000
407.6125
407.6250
407.6375
407.6500
407.6625
407.6750
407.6875
407.7000
407.7125
407.7250
407.7375
407.7500
407.7625
407.7750
407.7875
407.8000
407.8125
407.8250
407.8375
407.8500
407.8625
407.8750
407.8875
407.9000
407.9125
407.9250
407.9375
407.9500
407.9625
407.9750
407.9875
408.0000
408.0125
408.0250
408.0375
OG_STD-302N-R-429M_v10e
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Number of
Division n
32598
32599
32600
32601
32602
32603
32604
32605
32606
32607
32608
32609
32610
32611
32612
32613
32614
32615
32616
32617
32618
32619
32620
32621
32622
32623
32624
32625
32626
32627
32628
32629
32630
32631
32632
32633
32634
32635
32636
32637
32638
32639
32640
32641
32642
32643
Value
850
254
255
0
63
Programmable
Counter
N
Swallow
Counter
A
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
509
510
510
510
510
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
0
1
2
3
Circuit Design, Inc.
OPERATION GUIDE
Cautions
• 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.
• Do not use the equipment within the vicinity of devices that may malfunction as a result of electronic radio waves
from the radio module.
• The manufacturer is exempt from all responsibility relating to secondary damage resulting from the operation,
performance and reliability of equipment connected to 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 a part 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.
Circuit Design, Inc. All right reserved
No part of this document may be copied or distributed in part or in whole without the prior written consent of
Circuit Design, Inc.
Customers are advised to consult with Circuit Design sales representatives before ordering.
Circuit Design, Inc. believes the furnished information is accurate and reliable. However, Circuit Design, Inc.
reserves the right to make changes to this product without notice.
OG_STD-302N-R-429M_v10e
17
Circuit Design, Inc.
OPERATION GUIDE
Revision history
Version
1.0
Date
Apr. 2008
OG_STD-302N-R-429M_v10e
Description
The first issue
Remark
18
Circuit Design, Inc.
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