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Technical Datasheet 

User’s Manual 

Narrowband multi-channel data radio modem 

LinkWiser

-S400M

 

Cellution Inc. 
#317, NKIC, 48-84 Honguen-1dong, Seodaemun-gu, Seoul, Korea Zip: 120-760 
 
Enquiries: 

[email protected]

 / 

[email protected]

 

Voice: +82-2-3217-4838 / Fax: +82-2-3217-4831 

14

10dBm 

 

Writing: ‘AT+P=8’ // Set the Tx power at 8

th

 level 

Answer: > 

 
Description: Power of the Radio 

Value 

Tx power (dBm) 

8 < 

10dBm 

7 < 

9dBm 

6 < 

7.9dBm 

5 < 

6.3dBm 

4 < 

4.4dBm 

3 < 

2dBm 

2 < 

-1.3dBm 

1 < 

-7.0dBm 

0 < 

-40dBm 

 

12-4-3 RSSI level checking 

Reading: ‘AT+CSQ?’ 

Answer: ‘n’ 

 

Description: ‘n’ is a realistic RSSI level in the unit of ‘dBm’. 
Caution: One time RSSI level reading may not be correct due to circumstances. Thus, more than three 

times of RSSI level readings are recommended. 

 
12-4-4 Destination address setting 

Reading: ‘AT+ADDR?’ 

Answer: ‘n’ // n ranges 0~255 
 

Writing: ‘AT+ADDR=n’ 

 

Description: ADDR means a destination ID, if it is set ‘0’ in the ADDR, the radio enters into the 

Transparent mode. while it is set ‘1~255’ in the ADDR, the radio enters into the Address mode and 

delivers data to the preset destination ID of node only.

 

 

12-5 Timing Chart 

 
12-5-1 Maximum Packet Size 

The LinkWiser accepts 128bytes of packet size of USER DATA only as its one time maximum 

FIFO (First-In-First-Out) is 128bytes. If your packet size (USER DATA) exceeds over 128bytes, then 

you have to split them into several appropriate size of packets with considering the below timing chart 

& air rate. And also you have to put some delay between that divided packet and the packet with 

considering the below timing chart & air rate in order to complete successful transmission. 

 

12-5-2 Timing Chart Overview 
 

Figure1 shows a typical system block diagram comprising hosts (DTE user’s application) connected to 

LinkWiser. Host(A) will be sending and Host(B) will be receiving and processing this data. 

 

Summary of Contents for LinkWiser-S400M

Page 1: ...Narrowband Multi channel Data Radio Modem LinkWiser S400M Technical data Users Manual ...

Page 2: ...LABELING REQUIREMENTS 8 12 CONFIGURATION 9 12 1 ENTERING CONFIGURATION MODE 9 12 1 1 Command Format 9 12 1 2 Configuration Commands in details 9 12 1 3 Registers Description 10 12 2 TRANSPARENT MODE 11 12 2 1 Operation 11 12 2 2 Examples of configuration with AT commands for transparent mode 11 12 3 ADDRESS MODE 11 12 3 1 Operation 11 12 3 2 Examples of configuration with AT commands for address m...

Page 3: ...Wiser S400M without additional interface circuits It is all that just plug into power and connect it to DTE LinkWiser S400M supports point to point point to multi multi drop and repeater function in compliances with most of wire line based networking solutions such as Profibus Modubus Pelco D Pelco P etc and realizes LOS Line of Sight 1 6Km about 1 miles at max 10mW 10dBm output power LinkWiser S4...

Page 4: ...Cellution Inc 317 NKIC 48 84 Honguen 1dong Seodaemun gu Seoul Korea Zip 120 760 Enquiries sales cellution co kr support cellution co kr Voice 82 2 3217 4838 Fax 82 2 3217 4831 4 2 1 PICTURE 3 BLOCK DIAGRAM 4 FEATURES 9 simple 10 pin interface 9 2 different mode Transparent Address programmable ...

Page 5: ...12 5KHz of narrowband 9 424 447MHz Korea 9 Exceptional sensitivity 118dBm 4 8kbps 9 Long distance communication Up to 1 mile 1 6Km in line of sight 9 Operating temperature 30 80 C 9 Programmable COM baud rate 1 2 38 4kbps 9 Compliance with the registration regulation of the government 9 Low cost prompt delivery and no limit to the quantity of order 5 APPLICATIONS 9 Handheld terminals 9 Heavy vehic...

Page 6: ...Item no PIN Description Level Connected to the terminal DTE User terminal Remarks 1 VCC Power input 6 5VDC 24VDC 2 GND Power supply Ground DGND AGND 3 GND Power supply Ground DGND AGND 4 U I User Interface 5 RX_D Serial data receiving end CMOS TX_D RS232C 6 TX_D Serial data transmitting end CMOS RX_D RS232C 7 Sleep Sleep control input end 2 8V low Active 8 GND Power supply Ground DGND AGND 9 TEX S...

Page 7: ... 1 Channel step 12 5KHz OBW Occupied Band Width 8 5KHz 12 5KHz w 4 8kbps Frequency stability 2 0 ppm 30 to 80 C AFC applied Air data rate 4 8kbps GFSK w 12 5KHz NRZI HDLC PLL LOCK TIME free to RX 50us Free TX 1 RX to TX 80us RX TX 2 Operating voltage range 3 6V 10 Dimensions See the below dimension Transmitter part RF output power E R P 10dBm 1 dBm Max 13dBm available on request TX S N 40 dBc Spur...

Page 8: ...eiver Without a good antenna it is impossible to transmit data over a long distance The LinkWiser S400M has the SMA connector basically And it doesn t require additional antenna matching if you purchase Cellution s antennas In most cases the following basic rules will help you 9 Connect an antenna with 50 Ohm impedance 9 Place the antenna vertically straight up or down from the transmitter and rec...

Page 9: ...dio Module is initially powered up Configuration changes are stored permanently in non volatile memory within the Radio Module Exiting Configuration Mode and returning back to data transfer mode is accomplished by typing ATO at the command prompt This will force a soft reset of the Radio Module resulting in any configuration changes taking effect 12 1 1 Command Format LinkWiser module s parameters...

Page 10: ...table Access Registers Name Description R W S102 Serial Link Time Out Indicates the value of the time out on the serial link Ex a value 3 means a 3 milli sec time out time Refer to the below 12 5 R W S103 Sleep Mode Control Sleep Mode Control 0 Disabled Default module always active 1 Enabled If S103 1 the module will be controlled by I O1 I O1 0 Sleep Mode power down mode I O1 1 active R W S104 Se...

Page 11: ...dules in transparent mode behave like wired serial links Therefore radio modules automatically transmit every serial data received on their radio link and also transmit all radio information received on their serial link The transparent mode can be operated for both point to point and multipoint links The data flow control may be carried out by software applications used by various protocols such ...

Page 12: ...122 10 CR set device id to 10 Module User ATO CR exit from the configuration mode Module Good Bye To send data to specific I D of same group same network same frequency you have to set AT ADDR command before sending user data User AT ADDR 16 set the operation mode to address mode the destination I D is 16 User DATA 12 4 Extended AT Command Set This section describes the list of the extended at com...

Page 13: ...d to 40 seconds only Frequency channel table LinkWiser S447 A band Frequency MHz Value 447 2625 21 447 2750 22 447 2875 23 447 3000 24 447 3125 25 447 3250 26 447 3375 27 447 3500 28 447 3625 29 447 3750 30 447 3875 31 447 4000 32 447 4125 33 447 4250 34 447 4375 35 447 4500 36 447 4625 37 447 4750 38 447 4875 39 447 5000 40 447 5125 41 447 5250 42 447 5375 43 447 5500 44 447 5625 45 Frequency cha...

Page 14: ...iting AT ADDR n Description ADDR means a destination ID if it is set 0 in the ADDR the radio enters into the Transparent mode while it is set 1 255 in the ADDR the radio enters into the Address mode and delivers data to the preset destination ID of node only 12 5 Timing Chart 12 5 1 Maximum Packet Size The LinkWiser accepts 128bytes of packet size of USER DATA only as its one time maximum FIFO Fir...

Page 15: ...rval the data flow look like Figure2 but if you configure Serial Link Time Out value less than one byte interval the data flow looks like Figure3 We recommend Figure2 configuration rather than Figure3 for more robust RF transmission Configuring Serial Link Time Out like Figure3 enables to split the packet into several frames and re packetize that frame with adding pre defined preambles headers and...

Page 16: ...n 9600bps Over 1ms of the Serial Link Time Out value is recommended in 19200bps 12 5 4 Air Timing Apart from the above Serial Time Out value developers integrators MUST recognize calculate how long the LinkWiser occupy a frequency to complete transmitting the USER DATA from host s First of all you have to understand that the LinkWiser doesn t send the USER DATA as is The LinkWiser re packetizes th...

Page 17: ...on co kr support cellution co kr Voice 82 2 3217 4838 Fax 82 2 3217 4831 17 make sure that the input voltage range is within 6VDC to 24VDC 3 Please execute the terminal program Please click the connect after selection of a proper baud rate You can use the Set Macros function to make easier to write read our AT command sets However 0D 0A string should be followed for carriage return in this case ...

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