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LRS-455-EU Data Transceiver Users Manual 

 LUM0032AA Rev A 

Version 1.0 

24 

 

Additional Transceiver information 

This section contains additional important information about FreeWave transceivers. The following topics 

are included in this section: 

  Operational RS422 and RS-485 Information 

  RS232 Pin Assignments 

  OEM Board Pin Assignments  

Operational RS-422 and RS-485 Information 

For both RS-422 and RS-485, the FreeWave transceiver can drive 32 standard unit loads and loads the 

bus with only 1/8 unit load. This means the user can tie up to 256 devices on the bus if all of the line 

receivers have 1/8 unit load. 
RS-422 is used for 4-wire or full duplex communication with one Master and multiple Slaves. The 

FreeWave Master transceiver keeps the line driver asserted at all times. The maximum line length is 

4,000 feet using 2, 120 ohm twisted pair cables with a 5th wire for data common. 
RS-485 full duplex using 4 wire plus common is the same as RS-422, except the system can have 

multiple Masters on the bus. 
The most common operation of RS-485 is a two-wire comprised of a 120 ohm impedance single twisted 

pair. In this system the loading 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, set Modbus RTU to 1 and make Master Packet Repeat match in 

the transceiver(s) that will use RS-485. Also set TurnOff Delay to 4. 
The TurnOffDelay setting in the menu is used to control the length of time the transmitter driver stays 

asserted after data transmission has finished. This is needed to allow the last transmitted character to 

reach the end of a long line and is normally set to one character length of time. This setting also allows 3 

complete reflections to the end of the line to ensure the ringing on the line has fully dampened before 

releasing the bus to another device. Shorter line lengths may use shorter delays, but four one-quarter-

character delay times are recommended. In Modbus, a TurnOffDelay setting of 0 will cause internal timing 

errors. 
There is no provision for hand shaking in any of the above modes of operation, so data rates above 9600 

bps in RF Data Rate = 5 are not recommended without a protocol that can handle error detection 

properly. 

Содержание LRS-455-EU

Страница 1: ...r Manual LUM0032AA Rev A Version 1 0 i FreeWave Technologies LRS 455 EU Data Transceiver Version 1 0 Revision A FreeWave Technologies Inc 1880 South Flatiron Court Boulder CO 80301 303 381 9200 303 786 9948 Fax www FreeWave com ...

Страница 2: ...rical 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...

Страница 3: ...ate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However no guarantee shall be made that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is ...

Страница 4: ...S 455 EU series radios have been certified to the following ETSI standards ETSI EN 300 113 1 2009 ETSI EN 300 113 2 2009 ETSI EN 301 489 1 2008 EN 61000 4 2 1995 With A1 1998 and A2 2001 EN 61000 4 3 2006 EN 61000 4 4 2004 EN 61000 4 6 1995 With A1 2004 and A2 2006 EN55022 2006 ISO 7637 2 2004 ...

Страница 5: ...LRS 455 EU Data Transceiver Users Manual LUM0032AA Rev A Version 1 0 v ...

Страница 6: ...S 12 EDIT RADIO TRANSMISSION CHARACTERISTICS 12 Setting Xmit and Rcv Frequencies 12 1 and 2 Max Packet Size and Min Packet Size 12 3 Xmit Rate 13 4 RF Data Rate 13 5 RF Xmit Power 14 6 Slave Security 14 7 RTS to CTS 14 8 Retry Time Out 15 9 Lowpower Mode 15 A High Noise 16 C Remote LED 16 MULTIPOINT PARAMETERS 17 EDIT MULTIPOINT PARAMETERS 17 0 Repeaters 17 1 Master Packet Repeat 17 2 Max Slave Re...

Страница 7: ...032AA Rev A Version 1 0 vii FACTORY DEFAULT SETTINGS 23 OPERATIONAL RS 422 AND RS 485 INFORMATION 24 RS 422 and RS 485 Full Duplex Pin Outs 25 RS 485 Half Duplex Pin Outs 25 RS232 PIN ASSIGNMENTS 25 RF BOARD PINOUT 26 FREEWAVE TECHNICAL SUPPORT 26 ...

Страница 8: ... 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 other equipment To improve the data link FreeWave Te...

Страница 9: ...ave 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 applicat...

Страница 10: ...o match the baud rate 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 I...

Страница 11: ...to match the baud rate 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 ...

Страница 12: ...aracteristics 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 designates the transceiv...

Страница 13: ...ook Point to Point Slave Master Switchable 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 call...

Страница 14: ...the 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 appropri...

Страница 15: ...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 Protocol Additional Information RS232 Also used for T...

Страница 16: ... Default is zero delay For data rates of 1200 bits S or slower avoid setting the TurnoffDelay parameter higher than 4 At those rates the functionality of the microprocessor changes so that a TurnoffDelay of 5 will have the same effect as if set to 1 and a setting of 6 will have the same effect as 2 and so on Note TurnOffDelay must be set to a value of at least 4 for RS4xx operation FlowControl Thi...

Страница 17: ...received data in one burst This is the appropriate setting for most Modbus RTU devices With a setting of 2 and higher the radio will wait for a number of slots calculated by the following formula Modbus RTU Setting Master Packet Repeat Setting 1 x 2 For example in a radio where the Modbus RTU setting 2 and the Master Packet Repeat setting 3 the radio will wait for 2 3 1 x 2 or 12 slots ...

Страница 18: ...each 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 ...

Страница 19: ...and Hop Table Offset 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 LRS 455 EU transceivers must be programmed to operate on the appropriate frequency To program the transceiver for single channel operation enter the frequ...

Страница 20: ...ver off when no data is being passed The Xmit Rate setting allows the duty cycle of the Master Transmit Beacon to be changed A setting of 0 is the highest duty cycle and a setting of 9 is the lowest duty cycle 4 RF DATA RATE The RF Data Rate controls the data rate used for over the air communication and should not be confused with the serial port Baud Rate Currently the only supported RF Data Rate...

Страница 21: ... TO CTS Menu selection RTS to CTS in the Radio Parameters menu provides the option of allowing the RTS line on the Master transceiver to control the CTS line of the Slave This pass through control can be enabled in both Point to Point and Point to MultiPoint In MultiPoint networks the Master RTS line will control all Slaves CTS lines When enabled the CTS line ceases to function as flow control It ...

Страница 22: ...her hand the function in the Master is effectively the same With a setting of 255 the Master will allow a Slave to stay connected as long as 1 packet in 255 is successfully received at the Master The Retry Time Out parameter is useful when a MultiPoint network has a roving Master or Slave s As the link gets weaker a lower setting will allow a poor link to break in search of a stronger one Note Set...

Страница 23: ... in normal operation regardless of the Lowpower Mode setting Once RTS is dropped the transceiver reverts to the Lowpower Mode If the transceiver has the DTRConnect option set to 1 or 2 and if the Lowpower Mode enabled set to 1 31 the RTS line on the transceiver must be asserted for the DTRConnect feature to operate properly A HIGH NOISE The High Noise Option is useful in determining if out of band...

Страница 24: ...dge 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 networ...

Страница 25: ...ved 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 the RTS to CTS function is enabled on the radio then RTS to CTS takes precedence over D...

Страница 26: ... must match the end device B DIAGNOSTICS This option provides diagnostics data to be viewed at the Master in parallel with application data The diagnostic program MUST be run from the Master transceiver Diagnostics requires the following 1 Diagnostics set to 1 to 128 in the Master 2 A second computer or serial connection to run the diagnostics software 3 A diagnostics cable Available from FreeWave...

Страница 27: ...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 directly to Repeater1 Slaves 1 2 and 3 are forced along the direction o...

Страница 28: ...erating 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 the transceiver from mismatched antennas or cables or loose connections between the transceiver and ...

Страница 29: ...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 better antenna placement Note Please consult the install manual for antenna and FCC requirements OV...

Страница 30: ...32 485 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 CONNEC...

Страница 31: ...f 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 set Modbus RTU to 1 and make Ma...

Страница 32: ...Used 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 Thi...

Страница 33: ...level 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 trans...

Страница 34: ... 460 750 20 435 125 2080 448 000 4140 460 875 40 435 250 2100 448 125 4160 461 000 60 435 375 2120 448 250 4180 461 125 80 435 500 2140 448 375 4200 461 250 100 435 625 2160 448 500 4220 461 375 120 435 750 2180 448 625 4240 461 500 140 435 875 2200 448 750 4260 461 625 160 436 000 2220 448 875 4280 461 750 180 436 125 2240 449 000 4300 461 875 200 436 250 2260 449 125 4320 462 000 220 436 375 228...

Страница 35: ...720 464 500 620 438 875 2680 451 750 4740 464 625 640 439 000 2700 451 875 4760 464 750 660 439 125 2720 452 000 4780 464 875 680 439 250 2740 452 125 4800 465 000 700 439 375 2760 452 250 4820 465 125 720 439 500 2780 452 375 4840 465 250 740 439 625 2800 452 500 4860 465 375 760 439 750 2820 452 625 4880 465 500 780 439 875 2840 452 750 4900 465 625 800 440 000 2860 452 875 4920 465 750 820 440 ...

Страница 36: ...455 125 5280 468 000 1180 442 375 3240 455 250 5300 468 125 1200 442 500 3260 455 375 5320 468 250 1220 442 625 3280 455 500 5340 468 375 1240 442 750 3300 455 625 5360 468 500 1260 442 875 3320 455 750 5380 468 625 1280 443 000 3340 455 875 5400 468 750 1300 443 125 3360 456 000 5420 468 875 1320 443 250 3380 456 125 5440 469 000 1340 443 375 3400 456 250 5460 469 125 1360 443 500 3420 456 375 54...

Страница 37: ...680 445 500 3740 458 375 1700 445 625 3760 458 500 1720 445 750 3780 458 625 1740 445 875 3800 458 750 1760 446 000 3820 458 875 1780 446 125 3840 459 000 1800 446 250 3860 459 125 1820 446 375 3880 459 250 1840 446 500 3900 459 375 1860 446 625 3920 459 500 1880 446 750 3940 459 625 1900 446 875 3960 459 750 1920 447 000 3980 459 875 1940 447 125 4000 460 000 1960 447 250 4020 460 125 1980 447 37...

Страница 38: ...IRMWARE VERSION 1 70 Point to Point Repeaters are NOT supported FIRMWARE VERSIONS 1 67O AND LOWER Setting Master Packet Repeat to 0 and Modbus RTU to 1 results in a large data transmission delay Master Packet Repeat should be set to 1 or higher if the Modbus RTU setting is enabled ...

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