Communication Network Interface CNI-903M-1 Radio Pocket Modem User Manual

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Document ID	175299
Application ID	L9IiLDyd6r9Se39d5KZn3w==
Document Description	Users Manual
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Document Type	User Manual
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Date Submitted	2001-10-22 00:00:00
Date Available	2001-12-13 00:00:00
Creation Date	2001-05-03 14:03:53
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Document Lastmod	2001-05-03 14:05:16
Document Title	Users Manual
Document Creator	Acrobat 4.0 Scan Plug-in for Windows

CNI-903M Developer's Guide
User Guide to
CNI—903 M
(Radio Packet Modem)
CNI Inc.
CNI-SDBM Developer’s Guide
I. Overview
2. Specification and features
A.Enviranment
B‘General RF specifications
C.Radio interface
D. Transmitter
E.Receiver
3. Circuit guide
4. Installation Guide
Modem Description
Design Consideration
w‘msnkwwww
I3
Installation
14
Warning Label
15
Antenna Specificaqtion
21
CNI-903M Developer’s Guide
1. Overview
CNI-903M, RPM3(Radio Packet Modem), is a digital data communication
equipment in accordance with Mobitex specification. The frequency it uses ranges
from 896Mhz to 902Mhz for transmission and from 935MHz to 941MHz for reception.
This modem enables you to make data communication in two-way, and it also helps
you to enjoy various types of data services with full mobility due to support for
roaming.
With ‘Interface Connector’ you can apply this modem to many kinds of machines to
use ‘Mobitex Asynchronous Serial Communication (MASCT protocol for
communication. And it enables you to monitor the operation during communication.
0 Basic specification
- Dimension : 47 x 70 x 9mm
- Weight : 37 g
- Supply voltage 1 5.0V i 10%
- Protocol : Mobitex
- Host protocol : MASC
2. Specification and features
A. Environment
- Normal operational temperature : + 15°C ~ +35 'C
- Extreme operation temperature : -25'C ~ +55 °C
- Storage temperature : -40’C ~ +70“C
- Humidity : Withstand 20 ~ 70"/u RH.
B. General RF specifications
- Method of Modulation : GMSK
- Modulation frequency shift
2.0KHZ iOilKHz (Logic ‘1’)
-2.0KHz iO.lKHz (Logic ‘0’)
- Transmission mode : Half-duplex
— Datatransmission speed: 8,000bps
CNl-903M Developer’s Guide
C. Radio interface
- Channel spacing : 12.5KHz
- Bandwidth : less than lOKI—[z
D. Transmitter
- Frequency : 896 ~ 902 MHz
- Transmit power (MAX Power : 2W)
- Frequency stability : tlrippm (-25'C ~ +55"C)
Modulation stability : 15%
Harmonic and Spurious Emission : H -56dBc(Ponable)
E-60dBc(MobiIe)
Output Power in carrier off 1 0.251 W(-36dBm)
Spurious RF Radiation Carrier Off
fl -60dBm (896 ~ 902MHz band)
: D -80dBm (935 ~ 941MHZ band)
E. Receiver
- Frequency : 935 ~ 941MHz
Sensitivity : E-lli dBm ( BLER < 10%)
Adjacent Channel Rejection : > SSdB
Out—of-Band Rejection (foil to lOMl—Iz) : > GUdBc
Image frequency rejection : > 45dBc
CNI-QDZM Developer‘s Guide
3. Circuit guide
A. RF circuit
CNI—903M circuit consists of five parts, each of which is power supply, antenna,
synthesis 1 modulation of frequency, transmission and reception,
® Power supply
Power supply is composed of voltage regulator and switching part. Voltage regulator
generates 3V of power supplied from VBB when the control of RFAEN switch is
turned on.
When RF__EN is high, RF_VCC is regulated with 3V, and RF'VCC is supplied to
PLL IC, VCTCXO, OP-Amp(IC102), VCO, and Buffer Amp(QlO4).
When RX_EN is low, RXAVCC is turned on by QIO7, and RX_VCC (3V) is
supplied to LNA, MIXER, IF AMP and IF [C
When ’I'X_EN is low, TX_VCC is turned on by Ql06, and TXfiVCC (3V) is
supplied to Drive Amp(Q105) and OP-Amp(IC104).
The switch between TX mode and RX mode can be achieved by control of
RX_EN(Q107) and TX_EN(Q106).
® Antenna
Antenna part is composed of antenna matching circuit, BPF, and RX/I‘X signal
isolation circuit
CNI-903M adapts It /4 WHIP antenna to match to mid range frequency of
communication.
TX/RX signal isolation circuit isolates signals of communication and is composed
with switching diode and inductor.
The signals received from antenna meet the send/receive path and then mm is
turned on and the signals proceed only to receiving path. In transmitting mode,
signals from TX Power Amp can not go through RX path because D10] is offi (refer
to RF circuit diagram)
en?
CNI-903M Developer's Guide
© Frequency synthesizer and modulator
Frequency synthesizer consists of PLL part, VCO module and pre-modulation filtert
The PLL part is composed of phase detector, loop filter, and 12.6Mhz VCTCXO
VCO module generates 896~902Mhz frequencies in accordance with the voltage
which is from charge pump of PLL to loop filteri Programmable Divider in PLL
makes the VCO output frequency to any channel value according to the frequency
data from Logic CPU. Phase detector gets low and high fi'equencies from
comparison of phase. Loop filter filters the frequencies to get a value of voltage.
The voltage is input to VCO to achieve phase lock process.
Modulation is completed when modem lC signal of Logic pan is input to VCO and
authorized.
(D Receiver
Receiver filters and amplifies RF signal through SAW filter and LNA.
RX part is double super heterodyne type, and consists of LNA, LPF, Mixer, SAW
filter and IF IC part. There happens RX signal from antenna and the signal is low-
noise—amplificationaNA) through SAW filter and LNA, and it comes to 2nd lF
455KHZ via 2nd X-TAL(39.545MH2).
SAW filter rejects Image frequeney(fci 2‘IF) generated from l’st Mixer while
receiving For example, if the input channel is 939MHz, the output frequency would
be 40MHz from mixer while local frequency is 899MHZ. But if SAW filter will not
filter the image frequency of 93912*IF, S/N would be worse with 40Mllz(899-
859=40) of noise. And SAW filter should filter to prevent local frequency becoming
spurious through LNA and reverse path.
LNA amplifies and sends the faint signal from antenna to mixer, and mixer TR mixes
and generates lst IF with frequency from antenna.
lF comes from mixer. And lF contains inter-modulation product component. MCF
removes that product component. So clean lF(40Ml-lz) can be inserted to IF 1C. 2nd
local frequency entered IF IC is mixed with the IF(40MHZ) signal to be 2nd ]F of
CNI—903M Developer’s Guide
455KH1 simultaneously.
2nd IF signal of 455KHz passes LPF(Ceramic filer) to remove the noise, and the
signal is de-modulated with discriminator method. Here detected RF signal entered
into receiver and R88] signal which indicates the strength, and they are passed to
micro processor in analogue value.
© Transmitter
Transmitter consists of driver amp and power amplifier, and TX power control. It
generates carrier frequency while share RX with frequency synthesizerr
Local frequency is used to direct transmission frequency because there is difference
between transmission and reception. So it only amplifies and propagates through
PA(Power Amp.) which can get high level of gain easily with low power.
B. LOGIC Circuit
(D Summary
This unit consists of CPU part, Memory part, modem part, and power supply part.
(2) CPU part(IC2)
The CPU adode by this unit has 16/32—bit ARM7TDMI RISC processor
(66MHz) and works on 4MHz< The main functions are as follows;
- Execute MASC protocol
- Control PLL circuit of RF part and perform Power Saving function
- Perform Data transaction function( receiving and transmitting) through Data
Pump(Modem)part
- Checking and processing of RSSI Level come from RF pan
- Perform Data transaction with DTE through DTE interface part
@ Memory part (IC1,IC3)
Memory part consists of FLASH Memory (2Mb, lCl) and SRAM(1Mh, lC3).
FlashiMemory stores MSN information and program. And SRAM supplies
memory stocks for program.
CNI-903M Developer's Guide
® Modem Data Pump (IC7)
Modem part is in charge of MASC protocol , and transmits two way Dam
between CPU and RF part, The main functions are as followings ;
- Packet Data Framing
- GMSK Data Modulation
- FEC Encoding/Decoding
- Interleaving/De—imerleaving
CNI-903M Developer‘s Guide
2. Pin Assignments ofCNI—903M
This unit can be easily integrated into anywhere of the wireless modem adopted device.
ree
EDT IBM VIEW
an 2
00000
oe’u’oaa
O i I
fififi”
PIN ASSIGNMENTS
1. GND
2. RXAUDIO
3. GND
4, RTS
5. DSR
6, CTS
7. RI
8. DTR
9. INEANGE
10.
11.
12.
13.
14.
15.
16.
17.
181
19.
‘20.
ONI
SENSE 1
MSG
SENSE3
SENSE?
TXD
RESET
VB B
RXD
VBB
TXIND
: Ground to Host
: Rx Audio
: Ground to Host
2 Ready to send
2 Data Set Ready
2 Clear To Send
3 Ring Indicator
2 Data Transmit Ready
: In Range Indicator
2 On Indicator
: SENSEl
: Message Waiting
i SENSES
1 SENSE2
i Transmit Data
2 RESET
2 4,2V Power Supply
: Receive Data
: 42V Power Supply
: Transmit Indicator
10
NHXNU HQZ H
DNU
Emom.~ZU ho HmDUyflU mUfi—MHE
350 Micmac 5.8220
CNI-903M Developer's Guide
3. Power Supply
Example of Power Supply from out-source : input Voltage is SVilO‘Vn, current is
about 2[A].
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mm“ mauve 1; m .
12 A
CNl‘903M Developer’s Guide
I Design Considerations
To integrate a wireless modem, there are several issues that need to be addressed and
considered. internal connections and placement are critical to a successful implementation
A successful design requires attention to several support mechanisms as following:
DC Power
Serial interface and control
Mechanical mounting
Software
Antenna
RF control
1. Production Applications
The OEM wireless modem is well suited for mobile and fixed applications The wireless
modem enables user to send/receive data anytime anywhere, and can provide
communications for a wide variety of products
1.1 Portable Terminal Use
Portable designs produce good environment for an integrated modem. The portable
terminal is typically battery powered, subject to temperature extremes, and designed to
be physically strong When designing portable device, user needs to pay attention to
the following issue:
DC power noise levels on the host interface
Minimum operating voltage levels
Device internal ambient temperature
Antenna yin and proximity to user
Mechanical design for drop, vibration, dust, salt and liquid spill.
Note : Regarding this last point, CN'l-903M modem is designed on the assumption that the host
device will control these conditions
1.2 Fixed Mount Usage
Fixed-mount usage eliminates most of the mechanical constraints of handheld designs
The core requirement applies, but fixed usage does not present any special conditions
to address.
13 A.
CNI-903M Developer‘s Guide
l Installation
lnstalling CNI—903M modem is very simple as follows:
— Place the modem to connector on product housing, and apply a little force to
push it down to be connected
Caution : Care not to bend or damage the connector pinsl
- Use four #2-56 UNC 2A machine screws to tie up the modern as the figure
shown below.
— Connect modem connection cable to a small hole provided at the rear of the
modem.
- Connect the modem connection cable to Antenna
\ PANEL JACK
\ Mcx PLUj ERNGH' on NEW ANGLEW
1. Mounting
Proper mounting of the modem requires a combination of securely fastening it within the
product housing as well as adequately grounding the modem case to the housing
1.1 Fastening
Mount the modem to the rigid OEM product housing by using four $4266 UNC
2A machine screws as the figure shown below
1.2 Grounding
For CNl-903M modem, the pin number 3 of connector on the modem is ground
pin. So if user properly places the modem, ground is automatically donet
14 m
Gnl
CNI-903M Developer's Guxde
I Warning Label
Following warning label shall be attached on the devices using CNl-903M modems
While this device is in operation, a separation distance of at least 20 centimeters
(7.87 inches) is maintained between radiating antenna and the body of the user
or nearby persons in order to meet the FCC RF exposuxe guidelines.
15 f“-
CNI-903M Developer’s Guide
I Antenna Specification
Product Name : Whip Antenna of 900MHz Range
MODEL : HA—QOO-SSMA
Manufacturer : HanKook Antenna Company
® Application
This specification describes M4 WHIP ANTENNA used for frequency range of
900Ml-lz for transmission DATA of wirelessr
(2 Conditions of using Antenna
I Handheld I Fixed I Mobile I Outdoor I Indoor D Others
8) Shape of Antenna
Refer to attached dmwing No.
@ Electrical features and Performance
ltem Features/Performance Remark
Frequency range 896 ~ 941 MHz
Nominal impedance 50 Q
V.SW.R l : 240
Radiation Omni-direction
Polarization Vertical
Gain Unity
6) Structural Specification
Item Specification/Features Remark
Radiator 61.5 Speedo wire
Sleeve Shrinkable Tube F-Type 01.5
Connector SMA-Plug Ni—plating
Total length 85 13mm
16 /’_\C
CNI-903M Developer's Guide
© Other features and perl‘nrmance
At Temperature
Antenna shall not be deformed or damaged and shall satisfy “Clause 4“ in this
specification afler Placing Antenna at 40°C and 70 =C for 96 hours.
B. Humidity
Afier placing Antenna at surrounding temp. 40°C with relative humidity nf 90 ~ 95 for
96 hours, antenna shall not be deformed or damaged, and shall satisfy “Clause 4” in this
specification
” Efil'
CNI-903M Developer’s Guide
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Stimulus CHI MEN Stimulus CHI MEN
[MHZ] [dB] [MHZ] [dB]
894.000 -22.322 931.000 —21.178
896.000 -22.71 934.000 49.697
899.000 —23.158 936.000 48.528
901.000 -23.608 939.000 -17.647
904.000 43.981 941.000 -16.942
906.000 -24.393 944.000 —16.216
909.000 1 -24.983 946.000 -15.56
911.000 -26.191 949.000 —14.903
914.000 28.439 951.000 44.273
916.000 -32.236 954.000 43.759
919.000 {56.85 956.000 43.303
921.000 -33.206 959.000 42.973
924.000 -28.902 961.000 ~12.718
928.000 -25.681 964.000 42.636
929.000 r -23.126 966.000 -12.401
18
CNI-903M Developer’s Guide
- I
C141 MEN SWR L / REF 1 1 1“?
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C’E'Ef'EF‘ 919 . 990 Q'QB MHz SPHN 5218 BB? W'JL’TNHZ
< Picture2 >
Stimulus CHI MEN [dB] Stimulus [MHZ] CHI MEN
[MHz] [dB]
894.000 1.1658 931.000 11919
896.000 1.1579 934.000 1.231
899.000 —| 1.1494 936.000 1.2688
901.000 1.1413 939.000 1.3018
904.000 1.1349 941.000 13315
906.000 1.1283 944.000 1.3657
909.000 1.1134 946.000 1.4001
911.000 1.133] 949.000 14386
914.000 1.0787 951.000 1.4792
916.000 1.0501 954.000 1.5162
919.000 1.0298 956.000 1.5516
921.000 1.0447 959.000 1.5793
924.000 1.0744 961.000 1.6017
928.000 1.1099 964.000 1.6182
929.000 1.16 966.000 1.631
19 A
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CNl-903M Deve|oper‘s Guide
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< Picture?» >
Stimulus CH 1 CH 1 Stimulus CH 1 CH 1
[ MHz 1 MEN MEN xL [ MHz ] MEN MEN xL
R 191 19] R [Q] [9]
894.000 50.727 76973 931.000 44.422 60938
896.000 51.014 7.3359 934.000 44.288 7.9629
899.000 51.324 _| 6.9336 936.000 44.541 9.8516
901.000 51.551 6.5312 939.000 45.236 11.643
904.000 51.783 6.1953 941.000 46.184 13.26
906.000 52.045 5.8164 944.000 47.193 14.941
909.000 52.516 5.207 946.000 48.588 16.607
911.000 52.674 4.2658 949.000 50.299 18.336
914.000 52.416 3.0273 951.000 52.605 20.037
916.000 51.477 1.9902 954.000 55.584 21.381
919.000 50.026 1.4648 956.000 59.186 22.271
921.000 48.972 1.6152 959.000 63.238 22.281
924.000 47.242 2.1387 961.000 67.991 21.43
928.000 48.064 J 3.0977 964.000 71.57 19.496
929.000 46.029 4.4043 966.000 75.488 16.547
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