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FreeWave LRS400S, Manual

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FreeWave LRS400S Manual Download Page 16

LRS400S Data Transceiver Users Manual 

LUM0025AA Rev A 

Version 1.0 

16 

Radio Transmission Characteristics 

The Edit Radio Transmission Characteristics option allows the user to modify several different parameters 
in the transceiver. Many of these parameters must be maintained throughout the network for proper 
functionality.  

Note:

   This menu is 

only

 for the sophisticated user who has a good understanding of the principles of 

radio data transmission.  

The settings for the Slave(s) not determined by the Master are RF Xmit Power, Slave Security, Retry 
Time Out and Hop Table Size, Hop Table Version, and Hop Table Offset. 

 

Note: Above image from LRS455. Configuration will be the same. 

Edit Radio Transmission Characteristics  

S

ETTING 

X

MIT AND 

R

CV 

F

REQUENCIES 

 

The 400MHz Data Transceiver has the option to operate in a Frequency Division Duplex mode by 
transmitting on one frequency and receiving on another.  

The LRS400S transceivers must be programmed to operate on the appropriate frequency. To program 
the transceiver for single channel operation, enter the frequency, in Megahertz, into the TX and RX 
Frequency slots.  

If the transceivers are to operate in Frequency Division Duplex, the TX and RX Frequency slots will have 
different frequencies assigned. 

Summary of Contents for LRS400S

Page 1: ...sceiver Manual LUM0025AA Rev A Version 1 0 i FreeWave Technologies LRS400S Data Transceiver Version 1 0 FreeWave Technologies Inc 1880 South Flatiron Court Boulder CO 80301 303 444 9200 303 786 9948 Fax www FreeWave com ...

Page 2: ...cal or electromagnetic stress 2 If Product is used outside of FreeWave specifications 3 If Product has been modified repaired or altered by Customer unless FreeWave specifically authorized such alterations in each instance in writing This includes the addition of conformal coating Special Rate Replacement Option A special rate replacement option is offered to non warranty returns or upgrades The o...

Page 3: ...0025AA Rev A Version 1 0 iii CAUTION The LRS400S series transceiver have maximum transmitted output power of 2W It is recommended that the transmit antenna be kept at least 71 cm away from nearby persons to satisfy FCC RF exposure requirements ...

Page 4: ... 2 Max Packet Size and Min Packet Size 17 3 Xmit Rate 18 4 RF Data Rate 18 5 RF Xmit Power 18 6 Slave Security 19 7 RTS to CTS 19 8 Retry Time Out 19 9 Lowpower Mode 20 C Remote LED 21 MULTIPOINT PARAMETERS 22 EDIT MULTIPOINT PARAMETERS 22 0 Repeaters 22 1 Master Packet Repeat 22 2 Max Slave Retry 23 3 Retry Odds 23 4 DTR Connect 23 6 Network ID 23 8 MultiMaster Sync 23 9 1 PPS Enable Delay 23 A S...

Page 5: ...LRS400S Data Transceiver Users Manual LUM0025AA Rev A Version 1 0 v RS 485 Half Duplex Pin Outs 30 RS232 PIN ASSIGNMENTS 30 RF BOARD PINOUT 31 FREEWAVE TECHNICAL SUPPORT 31 ...

Page 6: ...e key to the overall robustness of the radio link is the height of the antenna In general FreeWave units with a higher antenna placement will have a better communication link In practice the transceiver should be placed away from computers telephones answering machines and other similar equipment The RS232 cable included with the transceiver usually provides ample distance for placement away from ...

Page 7: ...ve are acknowledged or retransmitted until they are acknowledged Therefore the return link in a MultiPoint network is generally very robust Note In licensed band operation it is suggested to set the repeated master packets at 0 due to the spectrum being quiet This will maximize throughput and leverage the advantages of licensed band operation Traditionally a MultiPoint network is used in applicati...

Page 8: ...te of the device that the radio is to be attached to Press Esc to get back to Main menu 6 At the Main Menu press 3 Set FreqKey Max Packet Size Min Packet Size RF Data rate identical on all radios in the network Note Changing these values may help to eliminate interference from other FreeWave networks Press Esc to get back to Main menu 7 At the Main Menu press 5 Set the Network ID value to any valu...

Page 9: ...of the instrument to which it is attached Please note when setting the transceiver s baud rate its RS232 data rate is set The baud rate does not have to be on the same setting for the two transceivers 5 Edit the Call Book Enter the Slave serial number in the Master s Call Book Enter the Master s Serial number in the Slave s Call Book or disable Slave Security in the Slave 6 Shortly after both tran...

Page 10: ...o transmission characteristics regardless of the settings in the Slave The settings not determined by the Master are RF Xmit Power Slave Security Retry Time Out and the Hop Table settings A quick method of identifying a Master is to power the transceiver Prior to establishing a communication link with a Slave all three of the Master s LEDs will be solid red Point to Point Slave 1 This mode designa...

Page 11: ...witchable 6 Mode 6 allows the transceiver to be controlled entirely through software commands A number of key parameters in FreeWave s user interface may be changed either directly with a program such as Windows Terminal or through the use of script files Additionally when the Point to Point Slave Master Switchable option is selected and the transceiver is not calling a Slave it will function as a...

Page 12: ...he baud rate for the other transceiver s in the network For example a pair of transceivers may be used in an application to send data from remote process instrumentation to an engineer s computer In this application the baud rate for the transceiver on the instrumentation might be set to 9600 and the transceiver on the engineer s computer might be set to 57 600 Set Baud Rate 1 Select the appropria...

Page 13: ... Packet Repeat must be set the same in all radios whether the network is in Point to Point or MultiPoint mode The Modbus RTU mode must be selected when transceivers are configured in RS485 or RS422 mode Serial Interface In products for which the protocol of the data port is software selectable use this menu to set the protocol of the data port In the TTL RF board product this setting must be 0 Pro...

Page 14: ... specifies the time after the end of transmission of a character to the RS485 bus that the transceiver stops driving the bus and releases the bus to other devices The units are of a character with a range of 0 9 An entry of 4 means a delay equivalent to the duration of a full character Default is zero delay For data rates of 1200 bits S or slower avoid setting the TurnoffDelay parameter higher tha...

Page 15: ...ch other Three settings must be made for two FreeWave transceivers to communicate in Point to Point mode 1 The Master s serial number must be listed in the Slave s Call Book or Slave Security is turned off in the Slave 2 The Slave s serial number must be listed in the Master s Call Book 3 The Master must be programmed to call the Slave The Call Book allows users to incorporate up to 10 FreeWave tr...

Page 16: ...Power Slave Security Retry Time Out and Hop Table Size Hop Table Version and Hop Table Offset Note Above image from LRS455 Configuration will be the same Edit Radio Transmission Characteristics SETTING XMIT AND RCV FREQUENCIES The 400MHz Data Transceiver has the option to operate in a Frequency Division Duplex mode by transmitting on one frequency and receiving on another The LRS400S transceivers ...

Page 17: ...packet sizes are optimized The following 3 tables provide the information to determine optimum setting values Minimum Packet Size Definition Min Setting Min Packet Size 0 0 1 16 2 32 3 48 4 64 5 80 6 96 7 112 8 128 9 144 Maximum Packet Size 2 level FSK Max Setting Max Packet Size 0 32 1 48 2 64 3 80 4 96 5 112 6 128 7 135 8 135 9 135 Maximum Packet Size 4 level FSK Max Setting Max Packet Size 0 32...

Page 18: ...ta link is preferred over data throughput Note In MultiPoint networks the RF Data Rate must be set identically in all transceivers Any transceiver with an RF Data Rate different from the Master will not establish a link In Point to Point networks the Master s settings take precedence over the Slave RF Data Rate Setting Occupied Bandwidth Modulation Level 1 50kHz 2 level GFSK 2 25kHz 4 level GFSK 3...

Page 19: ...transmit a message to the Slave with the new status This transmission will occur regardless of data being sent If data is ready to be sent the RTS status message will be sent in addition to the data In Point to Point mode the Master will continue sending the new status message until it receives an acknowledgment from the Slave In MultiPoint mode the Master will repeat the message the number of tim...

Page 20: ...number reduces latency and a high number reduces current consumption Setting Description 0 Lowpower disabled 1 LEDs dimmed transceiver remains awake transceiver is listening to the Master s transmissions on every slot and transceiver s data port is shut down if the RTS line is deasserted low In this case the transceiver needs to be awakened before it will be able to send data to the Master 2 LEDs ...

Page 21: ...ription Notes 0 Board LED s Default Only on board LEDs are enabled 1 Board and Remote LED s Onboard LED s are enabled as well as Remote LED s through the Diagnostic port 2 Remote LED s On board LED s are disabled Remote LED s are enabled through the Diagnostic port Note When using Remote LED s the center TX LED will not turn Green when in Setup mode This line is not pinned out ...

Page 22: ...e all data transmissions in a large network the Master would soon become overwhelmed with acknowledgments from the Slaves Without acknowledgements 100 confidence every Slave has received every packet cannot be met To address this issue the user may modify the Master Packet Repeat setting assigning a value between 0 the packet is transmitted once to 9 the packet is transmitted 10 times For networks...

Page 23: ...th the setting of 0 in the Slave the transceiver will transmit when RS232 data is received A setting of 1 will form a Point to Point link with the Master when the DTR line is high With a setting of 2 the transceiver will transmit in bursts This mode is valuable when a network has many low data rate devices and it is desirable to increase overall network capacity Note If DTRConnect is set to 1 and ...

Page 24: ...ork will not function A SLAVE REPEATER Normally a repeater does not have the ability to provide data on the data port When this capability is necessary Slave Repeater should be set to On When using Slave Repeater the baud rate and communication protocol must match the end device B DIAGNOSTICS This option provides diagnostics data to be viewed at the Master in parallel with application data The dia...

Page 25: ... manual for more information If both Rcv Subnet ID and Xmit Subnet ID are set to 0 the Subnet ID will show Roaming in the menu This setting will allow a mobile Slave to roam from subnet to subnet and possibly from network to network This drawing depicts a Network in which Subnet IDs are used to force communications In this example Repeater1 must talk directly to the Master Repeater2 must talk dire...

Page 26: ... from the time the transceiver is powered on until the radio is put into Setup mode Under ideal operating conditions the number of disconnects should be 0 One or more disconnects may indicate a weak link the presence of severe interference problems or loss of power to any of the radios in the link ANTENNA REFLECTED POWER This is a measurement of the transmitted power that is reflected back into th...

Page 27: ...ls measured at each frequency in the transceiver s frequency hop table The individual measurement values at each frequency hop channel are shown in the frequency table Pressing the Enter key when the Radio Statistics menu is displayed accesses the frequency table For a reliable link the margin should be at least 26 dB Low Average Signal Levels can often be corrected with higher gain antennas and b...

Page 28: ... 485 0 D Setup Port 3 E TurnOffDelay OnDelay 0 0 F Flow Control 0 Radio Parameters Default 1 MAX PACKET SIZE 9 2 MIN PACKET SIZE 1 3 XMT RATE 1 4 RF DATA RATE 5 5 RF XMT POWER 10 6 SLAVE SECURITY 0 7 RTS TO CTS 0 8 RETRY TIMEOUT 255 9 LOW POWER MODE 0 A High Noise 0 B MCU Speed 0 C Remote LED 0 MultiPoint Parameters Default 1 MASTER PACKET REPEAT 0 2 MAX SLAVE RETRY 9 3 RETRY ODDS 0 4 DTR CONNECT ...

Page 29: ...ading of the FreeWave transceiver is as described above which allows up to 256 1 8 unit load units on the bus Maximum line length is also 4 000 feet with a third wire required for data common The FreeWave transceiver will check the line to be certain no other device is transmitting before enabling the line driver for data transmission When setting the transceiver to RS 485 enable Modbus and set Ma...

Page 30: ...sed only in transceivers in Point to Point Slave Master switchable mode or for DTR Connect 5 GND Ground Signal return for all signal lines shared with Pin 9 6 DSR Data Set Ready Output Always high when the radio is powered from the 2 5mm power connector Indicated power is on to the radio Also this pin can be used for 12Volts when powering the transceivers directly through the RS 232 port Note This...

Page 31: ...evel on this pin will switch the radio into Setup mode Pin Assignment Color on ACS3610xx cable 1 B input Red 2 Interrupt temporarily ground to invoke menu Brown 3 Data Terminal Ready DTR Orange 4 Ground Black 5 Transmit Data TXD Yellow 6 Ground Black 7 Receive Data RXD Green 8 Carrier Detect DCD Blue 9 Request to Send RTS Violet purple 10 Clear to Send CTS Gray Note Pin 1 on the board level transc...

Page 32: ...3710 413 1875 2670 406 6875 3020 408 8750 3370 411 0625 3720 413 2500 2680 406 7500 3030 408 9375 3380 411 1250 3730 413 3125 2690 406 8125 3040 409 0000 3390 411 1875 3740 413 3750 2700 406 8750 3050 409 0625 3400 411 2500 3750 413 4375 2710 406 9375 3060 409 1250 3410 411 3125 3760 413 5000 2720 407 0000 3070 409 1875 3420 411 3750 3770 413 5625 2730 407 0625 3080 409 2500 3430 411 4375 3780 413...

Page 33: ...625 4160 416 0000 4620 418 8750 5080 421 7500 5540 424 6250 4170 416 0625 4630 418 9375 5090 421 8125 5550 424 6875 4180 416 1250 4640 419 0000 5100 421 8750 5560 424 7500 4190 416 1875 4650 419 0625 5110 421 9375 5570 424 8125 4200 416 2500 4660 419 1250 5120 422 0000 5580 424 8750 4210 416 3125 4670 419 1875 5130 422 0625 5590 424 9375 4220 416 3750 4680 419 2500 5140 422 1250 5600 425 0000 4230...

Page 34: ...0 428 5000 6320 429 5000 5850 426 5625 6010 427 5625 6170 428 5625 6330 429 5625 5860 426 6250 6020 427 6250 6180 428 6250 6340 429 6250 5870 426 6875 6030 427 6875 6190 428 6875 6350 429 6875 5880 426 7500 6040 427 7500 6200 428 7500 6360 429 7500 5890 426 8125 6050 427 8125 6210 428 8125 6370 429 8125 5900 426 8750 6060 427 8750 6220 428 8750 6380 429 8750 5910 426 9375 6070 427 9375 6230 428 93...

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