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Appendix G.  Short-Haul Modems 

G-2

The remote RF401 is typically powered via the datalogger’s CS I/O port.  

Refer to Section 

4.2

, 

Power Supplies 

(p. 13)

, for more information about power 

supplies. 

With short-haul modems it is necessary to configure the base 

station RF401’s “RS-232 Auto Power Down Enable” (in the 

Advanced Setup \ Interface Parameters menu) to mode "0" which 

will maintain the radio's RS-232 port always active.  This results 

in an additional constant 2 mA current drain by the RF401.  If you 

don’t do this, the base RF401’s RS-232 port will turn off 30 

seconds after activity and the attached SRM-5A (which gets its 

power from the port) will not receive any messages from the PC. 

Refer to Appendix 

B

, 

Advanced Setup Menu

 

(p.  B-1)

,  for 

information about the Advanced Setup menu. 

NOTE 

Содержание RF401

Страница 1: ...INSTRUCTION MANUAL RF401 series and RF430 series Spread Spectrum Data Radios Modems Revision 4 17 C o p y r i g h t 2 0 0 1 2 0 1 7 C a m p b e l l S c i e n t i f i c I n c...

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Страница 3: ...under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order Quotations for repairs can be give...

Страница 4: ......

Страница 5: ...digital cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European marke...

Страница 6: ......

Страница 7: ...ore beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit...

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Страница 9: ...AC adapter used must have a DC output not exceeding 16 5 Volts measured without a load to avoid damage to the RF401 RF430 Series radio Over voltage damage is not covered by factory warranty See Sectio...

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Страница 11: ...tep 4 Connect 11 3 3 Antenna Considerations 12 3 3 1 Line of Sight 12 3 3 2 Mounting 12 3 3 3 Antenna Cable Routing 12 3 3 4 Antenna Cable Weather Sealing 12 4 System Components 12 4 1 RF401 or RF430...

Страница 12: ...ber of Retries B 3 B 2 2 Number of Time Slots for Random Retry B 3 B 2 3 Number of Bytes Transmitted before Delay B 3 B 2 4 Sync Timer Setting B 3 B 2 5 Number of Retry Failures B 3 B 3 Received Signa...

Страница 13: ...le of our RF401 series radios 2 1 2 RF430 has a USB port allowing it to be connected directly to a PC s USB port 3 3 1 RF401 Basic Point to Point Network 9 3 2 Point to Point or PakBus communications...

Страница 14: ...the wake up initializer and remains asleep missing the data transmission D 3 D 4 DevConfig Deployment panel showing the CR206 X setup for Example 1 D 5 D 5 DevConfig Deployment panel showing the RF40...

Страница 15: ...of Contents v H 1 900 MHz Distance vs Path Loss Lp in dB per Three Path Types H 6 H 2 Path Type vs Path Characteristics Selector H 6 K 1 900 MHz Gain Antenna Test Distances K 6 L 1 Advanced Setup Men...

Страница 16: ...Table of Contents vi...

Страница 17: ...f there is a problem interference can be reduced using methods such as moving the device reorienting or using a different type of antenna or adding RF shielding The RF401 series and RF430 series radio...

Страница 18: ...e 922 MHz frequency is used in Australia Israel RF416 2 4 GHz Spread Spectrum Radio transmits data to another RF416 radio an RF432 radio a CR216 X datalogger or an AVW216 interface This product should...

Страница 19: ...2 its USB port will only communicate at 38 4 kbps Therefore the RF430 operating system will need to be updated to a newer version if the network will contain dataloggers that do not support 38 4 kbps...

Страница 20: ...network Radios set to PakBus Aware and radios set to PakBus Node can be in the same network PakBus Aware is the default setting for RF430 radios and RF401 radios with an operating system of OS4 or hig...

Страница 21: ...RF430 910 5 to 917 7 MHz RF411 RF431 920 0 to 927 2 MHz RF416 RF432 2 45015 to 2 45975 GHz Interface ports CS I O 9 pin RF401 series only RS 232 9 pin 4 wire Tx Rx CTS GND USB Port RF430 series only...

Страница 22: ...networks refer to Section 5 Software p 22 and Appendix F Non PakBus Example Configurations p F 1 For this system you will need the following hardware or the equivalent 1 Two radios either two RF401s o...

Страница 23: ...er for different Windows operating systems and assume driver files have been copied to the PC TABLE 3 1 PC Driver Installation Windows XP Windows Vista Windows 7 1 Connect the RF430 radio to a compute...

Страница 24: ...dio is connected to a PakBus datalogger CR200 X CR800 CR1000 CR3000 Otherwise use Transparent default for RF401 s with OS3 or lower SDC or CSDC Address Use default 7 only needed if remote radio is con...

Страница 25: ...tenna cable with Yagi or omnidirectional antenna attached to the RF401 antenna jack The separation between the base RF401 antenna and the remote RF401 antenna can be any convenient distance see Sectio...

Страница 26: ...d check for 12 V between CS I O connector pin 8 and pin 2 GND or contact Campbell Scientific c Configure the remote radio using the same settings as the base radio see e in Section 3 2 1 Step 1 Set Up...

Страница 27: ...4 Step 4 Connect You are now ready to connect to your datalogger using the LoggerNet Connect screen After you connect notice the flashing of the green LEDs on both radios This indicates that RF packe...

Страница 28: ...is very difficult to remove Some careful cable handling even pinholes can let in significant amounts of water thoughtful cable routing and good weather proofing can prevent this Apply a 1 8 inch thic...

Страница 29: ...ps Therefore the RF430 operating system will need to be updated to a newer version if the network will contain dataloggers that do not support 38 4 kbps Operating system updates are available from www...

Страница 30: ...its open circuit level The RF401 or RF430 radio will sustain damage if the Power jack voltage ever exceeds 18 Volts 120 VAC line voltages vary from location to location and from time to time so obser...

Страница 31: ...rt is not automatically selected by Auto Sense 4 2 3 Non datalogger Remote Site Radio to MD485 networks and radio to phone networks require a power supply with a null modem port at the non datalogger...

Страница 32: ...isted below Description 900 MHZ 0 dBd ANTENNA OMNI WAVE WHIP RPSMA STRAIGHT LINX 3 2 inches long 900 MHZ 0 dBd ANTENNA OMNI WAVE WHIP RPSMA RT ANGLE ASTRON 6 75 inches long 900 MHZ 3 dBd ANTENNA OMNI...

Страница 33: ...characteristics Thus a low power transmitter that complies with the technical standards in Part 15 with a particular antenna attached can exceed the Part 15 standards if a different antenna is attach...

Страница 34: ...RF430 series Spread Spectrum Radio Modems 18 FIGURE 4 3 Item 14201 900 MHz Yagi 9 dBd w Mounts FIGURE 4 4 Item 14205 900 MHz Yagi 6 dBd w Mounts FIGURE 4 5 Item 14221 900 MHz Omnidirectional Collinea...

Страница 35: ...RF401 series and RF430 series Spread Spectrum Radio Modems 19 FIGURE 4 6 Item 15970 900 MHz Indoor Dipole 1 dBd Window Wall Mounted FIGURE 4 7 Item 16005 2 4 GHz Omnidirectional 1 2 Wave Whip 0 dBd...

Страница 36: ...s and RF430 series Spread Spectrum Radio Modems 20 FIGURE 4 8 Item 16755 2 4 GHz Enclosed Yagi 13 dBd w Mounts FIGURE 4 9 Example COAX RPSMA L Cable for Yagi or Omni Colinear FIGURE 4 10 Antenna Surge...

Страница 37: ...requires the 14462 surge protector in order to connect to the radio The RG8 Antenna Surge Protector are recommended in preference to the COAXRPSMA in the following applications When the antenna cable...

Страница 38: ...dvanced setup menu DevConfig is included with Campbell Scientific s PC400 and LoggerNet datalogger support software and can also be downloaded at no charge from our website DevConfig is intended to fa...

Страница 39: ...ton on the bottom left of the DevConfig screen 7 Press the Setup button on the radio and DevConfig will display the Deployment panel defaulting to the RF401 RF411 RF416 or RF430 RF431 RF432 tab see FI...

Страница 40: ...mixed array datalogger CR510 CR10 X CR23X The ME Master setting should be chosen if a COM200 series phone modem or another ME configured device is connected to a base RF401 s CS I O port The baud rat...

Страница 41: ...s of using the PakBus Aware and PakBus Node Protocols compared to the Transparent protocol are Greater immunity to interference and RF collisions by using RF retries Ability to have standalone RF rout...

Страница 42: ...nless there are neighbouring RF401 RF430 networks Ideally neighbouring radio networks use different hop sequences to prevent interference Valid entries are 0 to 6 To determine if there is a neighbouri...

Страница 43: ...if you configure one of those it will be necessary to also configure each of the three bulleted parameters above In any case be sure to select the same Standby Mode for all of the radios in the netwo...

Страница 44: ...The settings entered in DevConfig s PakBus tab are only used when the radio is set to the PakBus Node protocol The PakBus Node protocol setting is for standalone RF routers repeaters In this mode the...

Страница 45: ...ntral Router Setting specifies a PakBus address for a router that is able to work as Central Router By specifying this setting the radio will be configured as a Branch Router meaning that it will not...

Страница 46: ...RF430 series Spread Spectrum Radio Modems 30 FIGURE 5 3 Select RF4XX for connection type for a multipoint non PakBus network FIGURE 5 4 For the datalogger settings the baud rate must match the radio s...

Страница 47: ...advertently maintained for a long period of time Maximum Time On Line applies to both scheduled connections and manual connections However for manual connections from the Connect Screen it is always b...

Страница 48: ...When connecting to servers older than LoggerNet 3 4 1 the behavior will be variable Generally you will be disconnected at some point but the timing of the disconnect will not be predictable Attention...

Страница 49: ...tion is inadvertently maintained for a long period of time Maximum Time On Line applies to both scheduled connections and manual connections However for manual connections from the Connect Screen it i...

Страница 50: ...Valid Radio Net Addresses are 0 through 63 Radio Address This is the unique radio address for the remote radio Valid addresses are 0 through 65 535 Advanced Maximum Packet Size Data is transferred in...

Страница 51: ...he radio networking protocols are used to direct packets not PakBus protocols the network s representation in PakBus Graph may be significantly different than one would expect FIGURE 5 7 depicts the p...

Страница 52: ...to a charging transformer problem The battery itself may have discharged too low too many times ruining the battery Lead acid batteries like to be topped off Power supply must be able to sustain at l...

Страница 53: ...tion between the RF401 and RF430 and commercial transmitter antenna Try horizontal polarization of antennas A field test in such situations is essential 8 There is insufficient signal strength There a...

Страница 54: ...is corrupted The remote possibility exists that this file has become corrupted in your PC After you create the Network Map in PC208W you can back up PC208W dnd in case this should happen If this appea...

Страница 55: ...there is no guarantee 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 turnin...

Страница 56: ...Appendix A Part 15 FCC Compliance Warning A 2...

Страница 57: ...1023 3 Net Address Mask 0 3fh 4 Radio Address Mask 0 3ffh 5 Hop Table 0 6 ii Radio Standby Modes 1 Standby Mode 0 24 mA Always ON 3 4 mA 1 2 sec Cycle 4 2 mA 1 sec Cycle 5 1 mA 2 sec Cycle 6 6 mA 4 s...

Страница 58: ...gure RF401 for Firmware Download b Interface Parameters i SDC Address Not Active 7 or 8 ii RS 232 Auto Power Down Enable 0 RS 232 always active to power RS 232 devices 1 RS 232 TX automatically powers...

Страница 59: ...average retry delays which will lower data throughput B 2 3 Number of Bytes Transmitted before Delay This feature prevents radios which have lots of data to transfer from tying up a network until it...

Страница 60: ...dio Parameters Radio Diagnostics menu RSS readings are cleared upon exiting the Setup Menu or cycling the radio s 12 Volt power The RSS reading is a relative signal level indication expressed in dB de...

Страница 61: ...set to about the same value What this value is will depend upon the nature of the anticipated activity The defaults are 5 seconds and 4 8 seconds so if you go more than 4 8 seconds without activity a...

Страница 62: ...default of 7 this number should be set to the Max Response Delay indicated in TABLE B 1 for the standby mode you are using plus 200 milliseconds 0 2 seconds For example if your standby mode delay is 2...

Страница 63: ...RF401 s address only the address bits that correspond to address mask 1 s are used in the comparison Example 1 Incoming Packet s Header Address xxxx xxxx xxxx xxxx RF401 s Network Address Mask 1111 1...

Страница 64: ...ddress mask to 3fh 0h so it will receive any packet that has the same Network Address and hopping sequence regardless of Radio Address Combined Network Radio Addresses If programming PC208W for Point...

Страница 65: ...001D 0 30 001E 0 31 001F 0 32 0020 0 1022 03FE 0 1023 03FF 1 0 0400 1 1 0401 2 0 0800 2 1 0801 3 0 0C00 3 1 0C01 4 0 1000 4 1 1001 5 0 1400 5 1 1401 6 0 1800 6 1 1801 7 0 1C00 7 1 1C01 8 0 2000 8 1 2...

Страница 66: ...Appendix C Address and Address Mask C 4 NET ADDRESS decimal RADIO ADDRESS decimal COMBINED 16 BIT ADDRESS hexadecimal 15 0 3C00 15 1 3C01 16 0 4000 16 1 4001...

Страница 67: ...kBus Address in LoggerNet 3 RF Protocol Select PakBus Aware if the RF401s and RF430s in your network are set to PakBus Aware or PakBus Node The Transparent setting must be used if your network include...

Страница 68: ...though these power modes introduce 1 second or 8 seconds respectively of latency they use less power than the always on modes With settings other than always on the radio receivers turn on periodicall...

Страница 69: ...3 This graph represents a radio that transmits a wake up initializer that is shorter than the cyclic sleep of the receiving radio The receiver does not detect the wake up initializer and remains aslee...

Страница 70: ...wakeup header if needed 8 Sec with Long Header radio wakes up every 8 seconds for 100 msec to look for wakeup header 0 5 mA current drain transmits a 8 2 second wakeup header if needed 8 Sec radio wak...

Страница 71: ...Appendix D Setting Up RF401 to CR206 X Communications D 5 FIGURE D 4 DevConfig Deployment panel showing the CR206 X setup for Example 1...

Страница 72: ...ate setting in the LoggerNet Setup screen must also be set to 9600 4 Select Hop Sequence 0 which matches the CR206 X s hop sequence FIGURE D 5 DevConfig Deployment panel showing the RF401 setup for Ex...

Страница 73: ...a CR206 X in a PakBus network CR206 X Example Setup 2 see FIGURE D 6 1 Enter PakBus Address 1 2 Select PakBus Aware for RF Protocol 3 Select Hop Sequence 0 4 Select Network Address 0 5 The Radio Addr...

Страница 74: ...setting in the LoggerNet Setup screen must also be set to 9600 4 Select Hop Sequence 0 which matches the CR206 X s hop sequence 5 Select Net Address 0 which matches the CR206 X s address 6 The Radio...

Страница 75: ...hich matches the CR206 X s and RF401 1 s hop sequence 4 Select Net Address 0 which matches the CR206 X s and RF401 1 s address 5 The Radio Address is fixed at 0 in PakBus modes 6 Select Power Mode 2ma...

Страница 76: ...Appendix D Setting Up RF401 to CR206 X Communications D 10...

Страница 77: ...ackets slightly in excess of 9600 baud When RF packets are received by the radio that data is immediately sent to the active interface port without flow control no RTS For many applications the radio...

Страница 78: ...eive line 5 Modem Enable I Raised when datalogger determines that associated modem raised the ring line 6 Synchronous Device Enable I Used by datalogger to address synchronous devices can be used as a...

Страница 79: ...ce in Auto Sense default setting for most applications In Auto Sense the RF401 will test for 5 V on CS I O port pin 1 to determine if a datalogger is present and if so select the CS I O port b Use Tra...

Страница 80: ...Retries can for example reduce pauses in real time monitoring of Input Locations i Click the Apply button F 2 Remote Station Setup Transparent Protocol 1 Point to point a Complete the steps above maki...

Страница 81: ...int represented a Setup map ComPort_1 RF400 RF400Remote CR10X 3 The station s Maximum Baud Rate is typically 9600 4 Extra Response Times are typically 0 s In the case of point to multipoint the RF401s...

Страница 82: ...rs sent for one second after command mode character 4 RF401 responds by sending OK CR The AT Command mode characters are sent by PC208W along with other commands to change the base RF401 s Radio Addre...

Страница 83: ...ATCN m R OK 1200 i D1000 creates a 1 second delay ii T sends quoted string w o waiting for a character echo iii is string sent to put RF401 in AT Command mode use other character if phone modems in pa...

Страница 84: ...Appendix F Non PakBus Example Configurations F 6 FIGURE F 2 PC208W Datalogger Generic Dial String...

Страница 85: ...nt to point see Section 3 2 Quick Start Point to Point or PakBus p 6 Default settings should work unless there is a neighbouring network RX LED Test To determine if there is a neighbouring RF401 netwo...

Страница 86: ...wn Enable in the Advanced Setup Interface Parameters menu to mode 0 which will maintain the radio s RS 232 port always active This results in an additional constant 2 mA current drain by the RF401 If...

Страница 87: ...Sometimes reflections provide a helpful path around an obstacle There can be some trees and bushes in the signal path with reduction in signal strength but a hill will block the signal effectively Th...

Страница 88: ...to take in making range estimates is to do a site survey that considers the topography location of antennas and radios and cable lengths make some assumptions about the path losses and see if there is...

Страница 89: ...with the exception of Lp Unfortunately signal path loss can make the difference between a marginal link mile apart and a reliable link 10 miles apart Transmitter Power Transmitter output power is oft...

Страница 90: ...wave 2 4 GHz ANT 2 4 CW RCT RP 16005 0 2 15 4 5 MaxRad Enclosed Yagi 2 4 GHz WISP24015PTNF 16755 13 15 1 17 Receiver Sensitivity Receiver sensitivity is usually specified in dBm for a specific bit er...

Страница 91: ...requency path length and position of the obstacle along the path An example at 900 MHz a 10 mile path length with an obstacle halfway along the path will see diffraction losses from an obstacle within...

Страница 92: ...e 2 mi 4 mi 6 mi 8 mi 10 mi 14 mi 18 mi 22 mi 26 mi 30 mi 2nd power 102 108 111 114 116 119 121 123 124 125 3rd power 105 114 119 123 126 130 133 136 138 140 4th power 108 120 127 132 136 142 146 149...

Страница 93: ...xRad BMOY8905 Yagi with 5 of LMR195 cable on a 4 pole Terrain is mostly flat with sagebrush How far can I go Pt 20 dBm Lt 50 x 11 1 dB 100 ft 5 55 dB Gt 9 dBd 11 15 dBi Lr 5 x 11 1 dB 100 ft 55 dB Gr...

Страница 94: ...Appendix H Distance vs Antenna Gain Terrain and Other Factors H 8...

Страница 95: ...ch device and can send the settings to each device Refer to the LoggerNet manual for more information about the Network Planner FIGURE I 1 Configuring a phone to RF401 network using the Network Planne...

Страница 96: ...CR1000_2 b ComPort_1 default settings c PhoneBase see FIGURE I 2 1 Maximum Baud Rate 38400 2 Modem Pick List per PC s phone modem 3 Extra Response Time 0 s d PhoneRemote input base site s phone numbe...

Страница 97: ...etwork in operation using the same hopping sequence as yours stop communications on your network and observe RF401 green LEDs for activity At this point any green LED activity would indicate that ther...

Страница 98: ...Appendix I Phone to RF401 Series I 4 FIGURE I 2 Phone base configuration...

Страница 99: ...Appendix I Phone to RF401 Series I 5 FIGURE I 3 Enter the base site s phone number...

Страница 100: ...RF401 CS I O port Connect the site phone line to COM220 Connect power to the PS100 Connect antenna to RF401 When you turn on the PS100 supply the RF401 receives 12V power and you will see the LEDs li...

Страница 101: ...2 POINT TO POINT COMMUNICATIONS Transparent Protocol PC Modem COM220 A100 PS100 RF401 RF401 Mixed array Datalogger null modem LoggerNet SETUP a Setup ComPort_1 PhoneBase PhoneRemote RF401 RF401Remote...

Страница 102: ...nsparent Protocol PC Modem COM220 A100 PS100 RF401 RF401 DL1 RF401 DL2 LoggerNet SETUP a Setup ComPort_1 PhoneBase PhoneRemote RF401 RF401Remote CR10X RF401Remote_2 CR10X_2 b ComPort_1 default setting...

Страница 103: ...agree with respective RF401Remote settings 2 Protocol Transparent 3 CS I O Baud Rate 9600 4 All other settings default If there is a neighbouring RF401 network you should change the Hopping Sequence...

Страница 104: ...nt which connector goes to which unit connect via SC12 cables to the COM220 and the base RF401 CS I O port Connect the site phone line to COM200 Connect power to the PS100 Connect antenna to RF401 Whe...

Страница 105: ...onfig see Section 5 1 DevConfig p 22 4 Configure the base radios s follows a Active Interface leave at default Auto Sense b Network Address can be default 0 if no neighbouring RF401 networks are opera...

Страница 106: ...er br 0 and press Enter to send it to CSAT3 to configure RS 232 communications to 9600 baud 9 Enter ri 1 and press Enter to send it to CSAT3 to turn on RS 232 drivers if you want to save this setting...

Страница 107: ...ecommendations are given as to where to place the system to avoid rf reflections see TESTING Wave Antenna footnote 2 in this appendix The basic parts of the system are 1 PC running a terminal program...

Страница 108: ...iver Take care to connect only pins 2 and 3 End view of male SC12 Connector 4 Press any alpha numeric keys on PC keyboard Make sure that Properties Settings ASCII Setup Echo characters locally or the...

Страница 109: ...uivalent ProcommTM setting is NOT enabled 4 Press Setup button on RF401 RF411 5 Select 3 to restore defaults then select 5 to save parameters and exit The presence of a neighbouring RF401 RF411 networ...

Страница 110: ...power to Remote RF401 RF411 Field Power Cable Item 14291 connected to a 12V battery battery can be an 8 cell pack of alkaline A C or D cells or a lead acid battery If your 12V power supply is a batter...

Страница 111: ...few to no characters echoed back 1 Be careful to not exceed maximum supply voltage of 16 VDC to RF401 RF411 Use quiet power supply without noise or hum a 12V lead acid battery is fine if no trickle ch...

Страница 112: ...3 dBd 900 MHz Collinear Omni Antenna d Set up remote RF401 RF411 with NO antenna and with antenna connector 20 inches above floor e Arrange antenna distance apart according to following table TABLE K...

Страница 113: ...ail Tests K 7 f Type 8 groups of 5 characters on the terminal aaaaabbbbbccccc etc g 100 of characters should appear on screen with good yagi collinear antenna h Removing yagi collinear antenna you sho...

Страница 114: ...Appendix K RF401 RF411 Pass Fail Tests K 8...

Страница 115: ...E OF INACTIVITY TO SLEEP sec LONG HEADER LENGTH L 01 24 mA 0 ms 700 ms 32 4 mA 5 43 2 mA 5 1200 ms 5 1 mA 5 2200 ms 6 0 6 mA 5 4200 ms 74 0 4 mA 5 8200 ms 1 Standard Setup menu selection 1 2 Standard...

Страница 116: ...ceive current of data request receptions Ir 4 The average receive current from time of inactivity to sleep Ii The remote RF401 RF411 s total average current It can be calculated over an interval T as...

Страница 117: ...g the average current drain contribution of the RF401 RF411 From the above section It Is Id Ir Ii Calculating each term Is table mA value 4 mA It 6 1 mA The dominant average current drain contributors...

Страница 118: ...It Is Ih Iq Ir Ii Calculating each term Is table mA value 4 mA It 6 9 mA As in Example 1 the standby mode current long header and the time of inactivity to sleep currents dominate the average RF401 RF...

Страница 119: ...de current Advanced Setup Menu selection 7 The same amount and frequency of data are collected as in Example 1 It Is Ih Iq Ir Ii Calculating each term Is table mA value 0 4 mA It 12 4 mA ms 8200 lengt...

Страница 120: ...de current Advanced Setup Menu selection 7 The same amount and frequency of data are collected as in Example 1 It Is Id Ir Ii Calculating each term Is table mA value 0 4 mA It 2 4 mA In this example t...

Страница 121: ...ata 10 data points are collected as in Example 1 however the frequency of collection is changed from once a minute to once an hour It Is Ih Iq Ir Ii Calculating each term Is table mA value 4 mA It 4 1...

Страница 122: ...The same amount of data are collected as in Example 1 however the frequency of collection is changed from once a minute to once an hour It Is Ih Iq Ir Ii Calculating each term Is table mA value 0 4 m...

Страница 123: ...01 RF411 must generate a longer long header which involves more transmit time at 73 mA However the remote site will normally benefit from a lower standby mode current since it does not usually transmi...

Страница 124: ...Appendix L RF401 RF411 Average Current Drain Calculations L 10...

Страница 125: ...and collision problems inherent in RF networks The RF PakBus Protocol 1 Minimizes the number of small link state packets transmitted over RF 2 Maximizes the RF packet size 3 Establishes an ad hoc poin...

Страница 126: ...re the PakBus Aware and PakBus Node protocols ignore the Radio Address and Radio Mask settings and limit the available Radio Net addresses to 0 1 2 or 3 M 6 Hop Metric Signal Strength and Standby Mode...

Страница 127: ...hop metric would be 1 1000 msec If the radio was doing the sec Cycle and signal level was 49 the composite hop metric would be 3 5000 msec The signal strength that is used for the hop metric is avera...

Страница 128: ...binations than available for the RF400 radios increasing the likelihood of RF401 networks that merge unexpectedly Also there is potential for interference from RF400 radios RF400 radios with Net Addre...

Страница 129: ......

Страница 130: ...ua Apinag s nbr 2018 Perdizes CEP 01258 00 S o Paulo SP BRASIL www campbellsci com br vendas campbellsci com br Campbell Scientific Canada Corp 14532 131 Avenue NW Edmonton AB T5L 4X4 CANADA www campb...

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