Wireless Modbus™ and 4-20mA Transceiver Model RXT-320
Contents
1. e 10 Typ KA si 8 35 52 S RXT Series Wireless Transceiver 3 3 E Detcon Mounting Plate EZ Optional bd l 16 Messi oles x i57 i Am 7 3 NPT Ports J va CON a E N 3n g mountin 2 ED d p holes A T Outlet Box w Drain p 5 8 1 mounting 8 32 tapped holes x2 ground point i a D 4 ns Custom Aluminum J Box L For Battery Option p 295 Figure 9 RXT 320 Wireless Transceiver w Battery Assembly and Mounting Dimensions 2 2 1 Remote Mounting The RXT 320 wireless transceiver is normally connected directly to the J Box containing the battery terminal board assembly In situations where RF line of sight is diminished by obstructions it may be necessary to remotely mount the wireless transceiver away from this J Box Remote separation distances of up to 15 feet are possible with the recommended cable Such an installation will require an additional J Box which connects to the separated transceiver and houses Detcon s 12 position terminal board plus additional hardware See Figure 10 RXT 320 Wireless IM Rev 2 1 Page 8 of 27 a RXT 320 Wireless Modbus detcon inc Remote RXT 320 Wireless Transceiver ES Remote J Box w 8 Position Terminal Board Remote 3 NPT T Outlet Box w Drain Power Modbus amp 12C Extension Cable to from Remote RXT Transceiver2. 3 NPT Cord Connectors lt Up to 15 Length Cable Glands Required B i J Box w aN Model 100 Terminal Board 3 NPT T Outlet Box w Drain ud Figure 10 RXT 320 Wireless Transceiver Remote Mounting A custom extension cable needs to be built per Figure 11 to interface the remote transceiver to the Model 100 Terminal Board The recommended cable for remote transceiver separation is Belden 1421A 24AWG shielded twisted pair 4 pairs w drain wire NOTE It is highly recommended to install the extension cable inside rigid metal conduit to eliminate potential EMI and RFI interference and to maintain a Class I Division I rating NOTE Color coding of the cable will no longer match the color coding on the Model 100 Terminal Board for the J1 connector NOTE Programming of RXT transceiver from the Model 100 Terminal Board will be disabled RXT 320 Wireless IM Rev 2 1 Page 9 of 27 detcon Inc RXT 320 Wireless Modbus TM RXT 320 TRANCEIVER WIRING RED POWER por lt RED POWER BLACK GND y 3 BLACK GND 0 MA m bee BLUE MODBUS A E i BLUE MODBUS A WHITE MODBUS B MEN m WHITE MODBUS B SENSOR i N p N B H E X ws RENTAR ORC
3. CLASS DIV 1 GROUPS CD T4 CLASS ZONE 1 GROUP IIB T4 denser RATED 7 30VDC 20 mA MAX Tamb 40 Cto 75 C Um z 30V Warning Potential electrostatic charging hazard See Instructions Intrinsically Safe Securite Intrinseque e US Do not use solvents or equivalent I Pr ntains intrinsi ircui i intertek Product go S sically safe circuits and Exia ETL Classified Conforms to UL STD 913 UL STD 1203 E Me Certified to CSA STD C22 2 No 30 CSA STD C222 No 157 gt FE nippy aint e perae E e Fd Figure 8 RXT 320 Approval Label 2 Do not use in areas containing air saturation levels of Acetic Acid Acetone Ammonium Hydroxide Fuel C Diethyl Ether Ethyl Acetate Ethylene Dichloride Furfural N Hexane MEK Methanol 2 Nitropropane or Toluene 3 Ensure that the transceiver is properly threaded into a suitable explosion proof rated junction box with a female 34 NPT threaded connection The sensor should be threaded up at least 5 full turns until tight Avoid use of Teflon Tape or any type of non conductive pipe thread coating on the NPT threaded connection RXT 320 Wireless IM Rev 2 1 Page 6 of 27 a detcon inc RXT 320 Wireless Modbus 4 A good ground connection should be verified between the sensor s metal enclosure and the junction box If a good ground connection is not made the sensor can be grounded to the junction box using the sensor s external ground lug Also verify a good ground
4. detcon inc Wireless Modbus and 4 20mA Transceiver Model RXT 320 Model RXT 320 Detcon Wireless Transceiver uy alr Operator s Installation and Instruction Manual DETCON Inc 4055 Technology Forest Blvd The Woodlands Texas 77381 Ph 281 367 4100 Fax 281 298 2868 www detcon com August 2 2012 Document 3588 Revision 2 1 detcon inc RXT 320 Wireless Modbus Page intentionally blank Shipping Address 4055 Technology Forest Blvd The Woodlands Texas 77381 Mailing Address P O Box 8067 The Woodlands Texas 77387 8067 Phone 888 367 4286 281 367 4100 Fax 281 292 2860 e www detcon com sales detcon com RXT 320 Wireless IM ii detcon inc RXT 320 Wireless Modbus TM Table of Contents 1 0 Introduction R 1 1 1 DESC E 1 1 2 RXT 320 Wireless Radio ete dilatar rabiar seais 2 1 3 Model 100 Terminal Board Optional essent rennen nenne 3 1 4 Smart Battery Pack Optional eese eene nennen nne en ementi neret eret nne 4 1 5 Quad Battery Charger Optional tecla ee ode eee pente be edge e Pe ede ee 5 1 6 Solar Panel Optional nr RERO ER d e ae ete Le ere PUR Yee eer cive 6 2 0 Installation PR 6 2 1 Guidelines for Sate Us id cd e ol 6 2 2 MOUDLTB ener iter i t ete ys decency ete ee ep t dti
5. interface is set up to be a master interface to the slave device which means the transceiver will act as the master to the sensor attached but be seen as a slave globally Modbus addressing will dictate how the transceiver deals with a request If the Modbus address in the request does not equal the address assigned to the RXT 320 the transceiver simply sends along the request unchanged on to its Modbus It will behave similar to transparent mode The request will be responded to if a sensor with an address equal to the address in the request is found If so the sensor will respond back to the transceiver via Modbus which will then send the response back to the controller over the RF network If the Modbus M address in the request equals the address assigned to the RXT 320 and does not fall within the RXT 320 internal registers the transceiver will translate the Modbus address to 01h and send along the request on its Modbus interface with the new translated address This translate function allows a single DM 100 sensor to be installed per each RXT 320 since all DM 100 sensors have a fixed address of Olh If a sensor with an address of 01h is found it will respond back to the transceiver via Modbus The transceiver will then translate the O1h address back to its original value and send the response back to the controller over the RF network If the Modbus M address in the request equals the address assigned to the RXT 320 and fa
6. 2000 These inputs present a load of 162 ohms to ground so a current of 20mA will develop around 3 4V across the input and ground This will consume a third less power versus the 250 ohm load used in other implementations The inputs are protected for voltages up to 30V but the input reading will reach a maximum of 2048 for currents greater than 20mA Electrically the 4 20mA interface supports 2 wire and 3 wire devices Figure 13 Up to two Sensors using two 4 20mA Interfaces RXT 320 Wireless IM Rev 2 1 Page 14 of 27 detcon inc RXT 320 Wireless Modbus TM NOTE The 4 20mA inputs do NOT support 4 wire implementations 2 3 5 Serial Clock amp Serial Data Line This is the C interface for the transceiver consisting of a serial clock SCL and serial data line SDA These are used to monitor the status of the battery pack if installed and to read the value of the Modbus address switches of the Model 100 Terminal Board if installed 2 3 6 Programming Data Clock amp Reset These connections are used to program the RXT 320 transceiver and should be used by Detcon personnel only 2 4 Model 100 Terminal Board Settings This section applies to transceiver assemblies that use the optional Model 100 Terminal Board This terminal board contains a set of jumpers that must be configured properly for the board to operate properly These jumpers are normally configured at the factory and should not be changed Misplacement of these jumpers ma
7. RXT Programming Interface to Wireless Transceiver Refer to section 2 4 for more information about the setup of the Model 100 Terminal Board RXT 320 Wireless IM Rev 2 1 Page 3 of 27 detcon Inc RXT 320 Wireless Modbus TM Pd WIRELESS DS Y Me 2 om X t ESES WIRELESS J a2 325 PROGRAM E N J MODBUS OUT POWER IN 3 WIRELESS SOLAR Qs Jagg 5 amp 262 EN EI e I E Jn l Ll Hain Lr Alala IH PN H FH I H HiH H m vA aA tx 285 ZA DISPLAY 4 Figure 4 Model 100 Terminal Board 1 4 Smart Battery Pack Optional The RXT 320 transceiver can also be powered by an optional battery pack that enables it to be remotely mounted without the need for any cables because of its wireless operation The available battery pack is Detcon s plug in Smart Battery Pack which provides an output of 12VDC See Figure 5 If installed the RXT 320 transceiver will detect the battery and will continuously query the battery pack for remaining battery life The battery pack consists of rechargeable Lithium Ion batteries and is equipped with integrated safety electronics that include fuel
8. connection between the junction box and earth ground 5 Proper precautions should be taken during installation and maintenance to avoid the build up of static charge on the plastic weather guard of the transceiver 6 Do not substitute components that are not authorized by the scope of the safety approval This may impair the intrinsic safety rating 7 Do not operate the unit outside of the stated operating temperature limits Do not operate the unit outside the stated operating limits for voltage supply 9 The sensor power supply common black wire must be referenced to the metal enclosure body ground during installation 10 These units are designed to meet EN60079 0 EN60079 1 EN60079 11 UL913 7 Ed and CSA C22 2 No 157 92 11 These units are designed have a maximum safe location voltage of Um 30V 12 These units pass dielectric strength of 500VRMS between circuit and enclosure for a minimum of 1 minute at a maximum test current of 5mA 99 2 2 Mounting The RXT 320 wireless transceiver should be vertically oriented and mounted to an explosion proof enclosure or junction box The J Box contains the optional Model 100 Terminal Board If a battery pack is used Detcon s custom J Box is needed to accommodate both the terminal board and the battery pack plus a T Outlet box with a drain is required See Figure 9 The RXT 320 wireless transceiver assembly is typically mounted on a wall or pole Obstacles between RXT transceivers
9. for compatibility with some controllers NOTE If the transceiver is assigned a Modbus address between EOh EFh on the Term board the RXT 320 will remap its address to the 80h 8Fh address respectively and function the same way 3 5 Sleep Mode A sleep mode is available to increase the battery life of the RXT 320 transceiver assemblies that have them Upon command from the Modbus M all RXT 320 transceivers will turn off their wireless radios for the requested period of time During this time there will be no communication possible with other RXT 320 transceivers The command is given through a single Modbus broadcast command Modbus address of 0 with the number of seconds to go to sleep Every RXT 320 transceiver that receives this command will turn off their on board radio and count down the seconds until it reaches zero at which time the radios will be turned back on The controller can query the sleep timer on its own transceiver to determine how many seconds are left and can begin Modbus communication when it reaches zero NOTE Sleep mode is not supported by transceivers that are in transparent mode since no address is assigned and therefore its internal registers are not accessible through Modbus M When the RXT 320 transceiver radio is put to sleep it will reduce the RXT 320 power consumption by about 90 This of course does not include other devices running off of the battery only the transceiver Generally the controller will
10. ic Avete P de et ente e ehe edo 7 2 2 1 Remote Mounting isse tet aae e ga EA pete canda ont Ra un EEUU AS 8 2 3 Wiring Connections FUNCHONS ssec nii a A E aea a Ea enn 12 2 3 1 VDC Power d VDE Reus RER 12 2 3 2 Modb us MA CEB eerie iles eet iere gae Oe taka Tne hes daa eee T deseen sets 13 2 3 3 LATINOS soared s eee tedio tee eti esos yeu a e ii ote este dd 13 2 3 4 4220mA At 6D nd a ERE EE ERE D Elo VO TT COTTE 14 2 3 5 Serial Clock amp Serial Data Line eese esee eene eene nne senes 15 2 3 6 Programming Data Clock amp Reset eese eese eese ene nenne nenne nennen nenas 15 2 4 Model 100 Terminal Board Settings sees nennen tenente 15 3 0 Operation and Config ration een bere terree teen e eeu anao o poene eaa n ooo cie ga gue Pera ea eaa ae nea ee eaa ae epe ee eaa 16 3 1 Transparent Moden ista rA RERO RR DUET rte AO 16 3 2 Master Configuration with Controller ooooccnnccnnnccnnocnnonccononnnononononaconnnonnnnonnnocnnn enne nennen tenens 17 3 3 Slave Configuration with Sensotec oiie E EE enne neene nennen nennen tenentes 17 3 4 Slave Configuration with Alarm Station ccccccccccssceceesscecceeeecceseeeeeeecaeecenaeecesneeeeeeaeeeeetaeeeeenees 17 3 5 MIU EC A A 18 4 0 Modbus Communications eese sees eee eee enses etse tta satanas tasa tes setas se essa tease ena conca sets setas toas eno 18 4 1 General Modbus Description eene ennemi n narra nano
11. inc RXT 320 Wireless Modbus 4 1 General Modbus Description The RXT 320 performs Modbus communication using the RTU transmission mode per the Modbus specification The basic frame format for Modbus consists of a Modbus address function code data and CRC Address Field Function Code Data CRC Figure 15 Modbus Frame Format As stated earlier the Address Field is the unique Modbus address of each device for the whole system The Function Code is the function to be performed The Data contains read or write data and is formatted according to the function being performed The CRC Cyclic Redundancy Code is used to detect errors in the frame Frames with errors are invalid and ignored Modbus transactions consist of both a request by the controller and response from the device being addressed so there are two frames transferred for every transaction Every request is evaluated by the RXT 320 to determine if it is addressed to it and whether it falls within the register address range If these two conditions are true the RXT 320 will then check to see if it is a valid Function Code Function Codes supported by the RXT 320 are Function Code 03 03h Read Holding Registers Function Code 06 06h Write Single Register Function Code 16 10h Write Multiple Registers If an invalid function code is performed then the RXT 320 will ignore the request by default and the controller will t
12. nn cnn narran naci n arranco 19 4 1 1 Modb sVM Exceptions ue t a ER Mes aan 19 4 1 2 Modbus Broadcast Requests esses eee been ete 6 cnn SAE ERE ATEAN rese nennen 20 4 2 Modbus Register Map amp Description coooonocccnnoccconnonnncnoncconnncnonnononnc nono nonnn nennen tenen nennen 20 4 2 1 Register Detcon TY De ee ee eren P S Ee DR RH REI eR 21 4 2 2 Register AlarmOQuipulS tii dilata S EE EH PERRO Mete dece AO 21 4 2 3 Register 4 20mA Reading esses eese en a E nee een nnne sen nnnnn acc nccnnnnnnnnss 22 4 2 4 Register Battery dr O iue e e te ete nt ee Hh eee Re n roles 22 4 2 5 Reoisterc uC Veron rroa adas 22 4 2 6 Register Sleep Time eee diete A iia 22 4 2 7 Register Control e e tiet o sese rH E eb sie diede em ei eee 23 4 2 8 Register SIGIus ai ati ettet eet t Hte ea ect Ed ee bee Md dvds Uer t s o osas 23 4 2 9 Register Address Switch eae e depre eterne eno eodeni orae eee eie a vea 23 4 2 10 Register TiMestaMp oooconnnnnoncnnnnnnnnnnnnnnnnnnnnnnnnccnnnn nn nn E nennen nnnnne sense ene nn nen senten enne ne innen nenne nenas 24 5 0 Troubleshooting Guid Irene en eI Etre etur aee deccensnaseudecccensedsudcceccsaessseUeceannansasccecassessdcdedeeserss 24 X MERECE E 24 YA E AR AAA 25 7 1 Sp re Ce EE 26 R2 REVISION EO9 sre du ette ste eoe n c eie ee eate Pee ete bM Fete ee 27 RXT 320 Wir
13. put the network to sleep after all devices have been polled on the network While the network is asleep there are no devices being read so the user will have to trade off power consumption versus the time between updating reading a device on the network 4 0 Modbus Communications The RXT 320 wireless transceiver incorporates an RS 485 two wire interface for communication with various Modbus devices such as a control system or sensor There can be up to 32 devices attached to an RXT 320 wireless transceiver and up to 32 RXT 320 transceivers on a single wireless network As with normal Modbus operation there can be only one Modbus master that polls all the other devices which are considered Modbus slaves Each slave device must have a unique Modbus address The Modbus master control unit with its transceiver is responsible for broadcasting requests and receiving slave device responses Slave device transceivers receive these broadcasts and pass the Modbus requests on to the slave devices attached When a response is generated by the slave device its transceiver transmits the response back to the broadcasting transceiver which then places the response on the bus back to the master control unit Modbus communication is accomplished by two wire half duplex RS 485 9600 baud 8 data bits 1 stop bit no parity through the transceiver s connection to the Modbus device RXT 320 Wireless IM Rev 2 1 Page 18 of 27 a detcon
14. stipulated in table The output voltage range must be between 7 30VDC Before applying power make sure that all wiring is correct Not all wires from the wireless transceiver are used in most configurations Wires that are not used should be individually capped off and secured out of the way in the T Outlet that mounts the transceiver to the J Box condulet This prevents exposure to any active components power or ground 2 3 2 Modbus A amp B The RXT 320 transceiver features a ModbusTM compatible communication port The connections are Modbus A blue wire and Modbus B white wire and are polarity dependent Modbus communication is accomplished by two wire half duplex RS 485 9600 baud 8 data bits 1 stop bit no parity through the transceiver s connection to the Modbus device It is necessary to set a Modbus address for the RXT 320 unless operating in transparent mode 2 3 3 Alarm 0 3 Each RXT 320 wireless transceiver provides outputs for up to four alarms Alarm 0 Alarm 1 Alarm 2 and Alarm 3 which can drive relays on custom terminal boards provided by Detcon There are four internal Modbus registers that directly control these outputs The outputs are open drain and rated for up to 300mA at 50V See Figure 12 They are not intended to drive alarm devices directly but rather to drive relay coils interposing relays which in turn will drive a higher current output Detcon alarm terminal boards are available that allo
15. the remote J Box and thread the transceiver into the remote T Outlet box until tight 6 Remove all 6 of the 4 pin phoenix connectors from the 12 position terminal board in the remote J Box and connect the RXT transceiver wires to 3 of the phoenix connectors per the wiring diagram in Figure 11 Reference Table 2 RXT 320 Transceiver Wire Identification for color code identification NOTE Wires that are not used should be individually capped off and secured out of the way in the T Outlet box so that they are not exposed to any active components power or ground 7 Reconnect these 3 phoenix connectors to their corresponding places back on the 12 position terminal board 8 Measure out the cable to be used for the extension cable to be no more than 15 feet long Feed one end of the cable through a 34 NPT cord connector cable gland and then into the 34 NPT hole located on the bottom of the remote J Box 9 Connect the cable wires of the extension cable to the remaining three 4 pin phoenix connectors from step 6 per the wiring diagram in Figure 11 Reference Table 1 Extension Cable Wire Identification for color code identification 10 Reconnect these 3 remaining phoenix connectors to their corresponding places back on the 12 position terminal board and thread the 34 NPT cord connector to the bottom of the remote J Box 11 Install the J Box cover of the remote J Box 12 Feed the other end of the cable through another 34 NPT cord connector a
16. the assembly and can be installed in conjunction with the optional battery pack providing a constant power source The external power supply will also maintain the battery pack fully charged with no overcharging issues to be concerned with due to the battery pack s smart circuitry In this configuration external charging of the battery pack will not be necessary In the event the external power fails the battery pack will continue to power the wireless transceiver assembly until external power is restored or the battery is discharged If the Model 100 Terminal Board option is not used power to the transceiver should be directly applied to its red and black wires accordingly If the terminal board is used wiring designations for power are and External DC Power In on the J5 connector of the Model 100 Terminal Board The maximum wire length between the transceiver assembly and a 24VDC source is shown in Table 3 Wire Gauge vs Distance The maximum wire size for termination in the J Box is 14 AWG Table 3 Wire Gauge vs Distance AWG Wire Dia Meters Feet Overturn Protection 22 0 723mm 700 2080 3A 20 0 812mm 1120 3350 5A 18 1 024mm 1750 5250 7A 16 1 291mm 2800 8400 10A 14 1 628mm 4480 13 440 20A NOTE Wiring table is based on stranded tinned copper wire and is designed to serve as a reference only NOTE The supply of power should be from an isolated source with over current protection as
17. 20 Wireless Modbus 7 0 Specifications Frequency ISM 2 4GHz Range Indoor No Line of Sight 1 000ft Outdoor RF Line of Sight with external antenna 3 Miles Spread Spectrum Digital Sequence Spread Spectrum DSSS Modulation 0 QPSK Sensitivity 102dBm 1 PER Inputs RS 485 Modbus RTU 9600bps Two 4 20mA inputs Outputs RS 485 Modbus RTU 9600bps Power Input 7 30VDC Power Consumption Base RXT 320 unit 500mW 20 mA max at 24VDC Total Power is dependent on communication update rate between RXT 320 transceivers Operating Temperature Range 40 C to 85 C Approvals cETLus Class 1 Division 1 Groups CD ATEX 112GEx d ib ib IIB T6 pending CE Marking pending Dimensions 8 3 H x 2 4 Dia Weight 300z 850g RXT 320 Wireless IM Rev 2 1 Page 25 of 27 RXT 320 Wireless Modbus TM Spare Parts Part Number Spare Parts 976 000320 316 RXT 320 Wireless Transceiver Part Number Optional Accessories 897 850800 010 NEMA 7 Aluminum Condulet Base 897 850400 010 NEMA 7 Aluminum Condulet Solid Cover 897 850902 010 NEMA 7 Tall Aluminum Condulet w Window Cover Required for Battery Option 960 202200 000 Condensation prevention packet For condulet replace annually 800 004221 000 Mounting Plate 8522 750 34 NPT Plug 899 15075 34 NPT x 1 5 Nipple 897 044400 34T 34 NPT T Outlet Box w Aluminum Cover
18. 898 52310 V2 NPT Drain 899 07550 34 NPT to Y2 NPT Adapter Required for Drain 500 005168 100 Model 100 Terminal Board 976 000303 012 12V Smart Battery Pack 976 000304 004 Quad Charger w AC Adapter 500 003198 000 12 Position Terminal Board Remote Mounting 301 58205 34 NPT Cord Connector Remote Mounting RXT 320 Wireless IM Rev 2 1 Page 26 of 27 a detcon inc RXT 320 Wireless Modbus 7 2 Revision Log Revision Date Changes made Approval 1 0 05 19 10 Original Release LBU 1 1 11 12 10 Update to table 1 Wire Identification LBU 2 0 04 12 11 Extensive revision and detail added to all aspects of LBU manual 2 1 08 02 12 Updated board and wiring diagrams updated spare part list LBU RXT 320 Wireless IM Rev 2 1 Page 27 of 27
19. C power jack of the charger providing 24VDC The Quad Battery Charger has four charging ports each with 8 pin Beau connectors for battery pack connection The ports and connectors are keyed to prevent incorrect positioning and connection Each port has its own FAULT LED indicator and CHARGE LED indicator and will display either a red light or green light depending on the status of each battery being charged Charging times will vary depending on the charge state of each battery pack but a full charge of a depleted battery pack can take up to 24 hours Figure 6 Quad Battery Charger When first powered on and with no battery packs connected to the charger all the LED indicators on the Quad Charger should be green When a battery pack is seated into a charging port the CHARGE LED will change from green to red indicating the battery pack is not sufficiently charged Once fully charged the LED will change from red to green and the battery pack is ready to be used The Fault LED should remain green indicating that there are no problems with the battery pack or charging port If the Fault LED turns red with the battery pack connected then there is a problem or issue with the battery pack and it should not be used and be removed immediately If the Fault LED turns red without a battery pack connected to the charge port then there is a problem or issue with the port and that port should no longer be used Battery p
20. F Slave 80 8F EO EF Alarm Station F8 FF Reserved per Modbus 3 1 Transparent Mode In transparent mode the RXT 320 wireless transceiver behaves like a wired Modbus device in that any data transmitted over Modbus will be passed on over the RF network and be broadcast to all other RXT 320 s in the wireless network and presented on their respective Modbus interface The transparent mode is achieved by setting the transceiver s Modbus address equal to 00h through the transceiver s terminal board If the Model 100 Terminal Board is not installed the transceiver will default to an address of 00h The transceiver will behave as neither a master nor slave and its internal RXT 320 registers can not be accessed Any devices connected to a transceiver in transparent mode will receive all controller requests via the Modbus interface and a response by the device will occur only if its Modbus address is equal to the request address If so the device will respond back to the transceiver via Modbus which will then send the response back to the controller over the RF network RXT 320 Wireless IM Rev 2 1 Page 16 of 27 detcon inc RXT 320 Wireless Modbus TM NOTE Transparent mode does not support accessing the internal registers of the transceiver through Modbus since there is no address assigned Consequently many features are not available such as sleep battery status 4 20mA inputs and alarm outputs 3 2 Mas
21. VELA Y 700 Series Transient Protection PCA RED POWER WIRELESS is 2882S gt Jw 333 gt Ye A PROGRAM EN Z El AN El POWER IN SOLAR WIRELESS o gt aag 8 MODEL 100 TERMINAL BOARD Figure 11 Wiring Diagram for Remote RXT 320 Transceiver Mounting RXT 320 Wireless IM Rev 2 1 Page 10 of 27 a detcon inc RXT 320 Wireless Modbus Remote Mounting Steps 1 Remove the J Box cover of the RXT 320 wireless transceiver assembly 2 If the wireless transceiver assembly has the Smart Battery Pack unplug the battery pack from the terminal board by pulling the battery pack out of the junction box 3 Identify the J1 6 pin phoenix connector and the J8 3 pin phoenix connector on the Model 100 Terminal Board and disconnect from the board Remove all transceiver wire connections from the connectors Reconnect the 3 pin connector to its corresponding place and save the 6 pin connector for step 13 4 Usea wrench at the bottom section of the RXT transceiver and unthread the RXT until it can be removed 5 Feed the RXT transceiver wires through the 3 NPT hole of the remote T Outlet box connected to
22. acks can remain connected to the charger even after a full charge indication Green Charge LED is shown due to the protection circuitry of the battery pack which prevents any overcharging issues RXT 320 Wireless IM Rev 2 1 Page 5 of 27 detcon Inc RXT 320 Wireless Modbus TM 1 6 Solar Panel Optional Detcon also offers an optional solar panel to be used in conjunction with the Smart Battery Pack It provides 24VDC output and connects to the J5 connector of the Model 100 Terminal Board This option enables continuous operation of the wireless transceiver and charging of the battery pack eliminating the need for external recharging It is an ideal choice for virtually any area with sufficient daily average sunlight Since the solar panel is considered and external power supply a special conduit installation will be required If the optional solar panel is installed consideration should be given to position the panel where the most sunlight is available The solar panel can be mounted remotely to allow for maximum sunlight exposure If necessary a sunshade can be used for the wireless transceiver assembly to help reduce its operating temperature ha il sel m q ho wem hal x hal G en Figure 7 Solar Panel 2 0 Installation 2 1 Guidelines for Safe Use 1 Install unit only in areas with classifications matching with those described on the approval label Follow all warnings listed on the label PI ASA 10
23. anism for place all RXT 320s in a system to sleep to conserve battery power If there are no batteries used within the network of RXT 320 transceivers this register is not utilized RXT 320 Wireless IM Rev 2 1 Page 22 of 27 a detcon inc RXT 320 Wireless Modbus Upon power up this register is set to 0 and the RXT 320 is not in low power mode To place a network to sleep the controller will generate a broadcast request Modbus address 0 and do a single write function code 06 to register 8202 with the number of seconds the network should go to sleep During sleep there can be no access to any device on the network so the user will have to trade off sleep time versus getting device updates Once a non zero value is written to this register on all RXT 320s they will begin counting down until the Sleep Time reaches zero at which time all RXT 320s should be active again and ready for network communication The controller can monitor the sleep time remaining by accessing Sleep Time register on the RXT 320 attached to it The Modbus M interface remains active only the wireless network is placed in a low power state The value of this register can be between 0 and 65535 which allows a maximum sleep time of 18 2 hours Removal of power will reset Sleep Time to 0 4 2 7 Register Control The Control register is generally unused and should not be written to normally Using the control register the RXT 320 can be reset Modbus exception
24. be accessed by the master and provide additional control and status from that transceiver Using these registers the master controller can control alarm outputs read the two 4 20mA inputs read battery life or put the network to sleep to conserve battery The address also determines the mode of operation for the transceiver This will determine if it is attached to a master controller or if it is attached to a slave device 3 0 Operation and Configuration The RXT 320 wireless transceiver assembly will power up as soon as power is applied There is no external power switch to the assembly NOTE Before applying power check to make sure that all the wiring connections and external devices are installed correctly NOTE Applying power with devices hooked up incorrectly may cause damage to the equipment The user will need to manually configure the Modbus address for the RXT 320 from the Model 100 Terminal Board If there is no Model 100 Terminal Board the transceiver will have no address and function in transparent mode After the transceiver has been configured and powered up it will begin normal operation If the unit has been configured properly the unit will operate differently based on the address given from the terminal board which is read once every five seconds using the IC interface Table 5 RXT 320 Addressing and Operational Modes Modbus Address hex RXT 320 Function 00 Transparent Mode FO Master 01 7F 90 D
25. can impact RF line of sight and may result in communication problems Each transceiver should be in view of at least one other transceiver In some cases it may be necessary to extend and elevate the RXT transceiver away from the J Box device assembly Refer to section 2 2 1 for such remote mounting applications Detcon offers an optional mounting plate that can be used for mounting the wireless transceiver assembly on a wall or pole If ordered with this option secure the wireless transceiver assembly to the mounting plate using two of the four 3 8 diameter holes located on the top face of the mounting plate If not already done so from the factory The whole assembly can now be mounted on a secure wall using the four 7 16 diameter holes located on the base of the mounting plate See Figure 9 The assembly can also be mounted to a pole with two U Bolts secured through the 7 16 holes on the base NOTE If wall mounting without the mounting plate make sure to use at least 0 5 spacers underneath the J Box s 1 4 mounting holes to move the wireless transceiver assembly away from the wall and allow clearance to the transceiver RXT 320 Wireless IM Rev 2 1 Page 7 of 27 a detcon Inc RXT 320 Wireless Modbus
26. cifically this is used to place all RXT 320s in a low power sleep state to conserve battery life If none of the RXT 320s are battery powered there is no need to issue a sleep command According to the Modbus specification a broadcast request is defined as a request with the Address Field set to O and is used for writing only There is no response returned as with normal Modbus transactions since all devices on the system are accessed at the same time Both Function Codes 06 and 16 writes are supported with a broadcast request on the RXT 320 Since there is no response on the broadcast request there is a requirement to wait for a period of time before sending out the next request This allows all slave devices to process the command before the next request is received This is defined as the turnaround delay This turnaround delay should be approximately 150 milliseconds for broadcast requests sent to the RXT 320 Controllers in general can meet this timing because it takes longer than this to generate the next request so it may be unnecessary to make any adjustments to meet this timing NOTE Controllers that generate Modbus broadcast requests to the RXT 320 must ensure a turnaround delay of 150ms is met otherwise the next request can cause the broadcast request to be overwritten and ignored Broadcast requests are not confined to sleep commands but can be used where any normal write command is used Broadcast requests received by th
27. connectors are seated correctly and not offset Reseat connector is necessary Modbus Communication Problems Probable Causes Incorrect Modbus address incorrect rotary switch settings incorrect wiring Verify Modbus address corresponds to the appropriate function desired Master Slave Transparent Mode Alarm Station Verify there are no duplicate Modbus addresses on the network Verify Modbus address has been configured correctly on term board rotary switches Verify correct polarity on Modbus wiring Condensation Problems Probable Causes Loose cover on T Outlet box loose cover on transceiver housing loose NPT connections to condulet j box expired condensation prevention packet Verify cover is tight on T Outlet box and transceiver housing Verify all NPT connections are secure and tight Replace condensation prevention packet 6 0 Warranty Detcon Inc as the manufacturer warrants under intended normal use each new Model RXT 320 wireless transceiver to be free from defects in material and workmanship for a period of one year from the date of shipment to the original purchaser Should the transceiver fail to perform in accordance with published specifications within the warranty period return to Detcon Inc for necessary repairs or replacement All warranties and service policies are FOB the Detcon facility located in The Woodlands Texas RXT 320 Wireless IM Rev 2 1 Page 24 of 27 a detcon inc RXT 3
28. e RXT 320 are also passed on to the local Modbus interface to allow a controller to write to slave devices on that interface 4 2 Modbus Register Map amp Description When the RXT 320 is assigned a Modbus address the following registers become available to the controller for access All RXT 320 transceivers implement this register set If the RXT 320 is configured as an Alarm Station address 2 80h 8Fh or EOh EFh then a secondary set of registers is made available for controlling Alarm Outputs Table 8 Both register maps are shown below Some registers are Read Only R and others are Read Write R W as shown by the Access column This equates to specific function codes where Read is function code 03 and Write is function code 06 or 16 NOTE A write to a Read Only register is allowed and returns a response but it does not change the value of the register In some devices this would return an exception code The following sections will describe each register or register set for the register maps RXT 320 Wireless IM Rev 2 1 Page 20 of 27 detcon inc RXT 320 Wireless Modbus TM Table 7 RXT 320 Register Map Register Access Name Description 8192 R Detcon Type Detcon Register Type 22 for RXT 320 8193 R W Alarm 0 Output Controls the Alarm 0 Output 8194 R W Alarm 1 Output Controls the Alarm 1 Output 8195 R W Alarm 2 Output Co
29. eless IM iii detcon inc RXT 320 Wireless Modbus Table of Figures Figure 1 RXT 320 Wireless Transceiver Assembly eese enne ee nennen nre 1 Figure 2 Typical Wireless Layout eene cete ds 2 Figure 3 Mesh Network Topology essen enenenennetnnrs enne een ter enne enne nnne 3 Figure 4 Model 100 Terminal Board eese eene conan nano nne e nemen rra nac neret 4 Figure 5 Smart Battery Pack zai et c te ate reete ne RE ETE 4 Figure 6 Quad Battery Charger ih e eee ti ree cendi ote exa de Rte de 5 Figure 7 Solar P nel 2 eed tede o Let ee i rg ege ERE e ee Ce D E HORE ae 6 Figure 8 RXT 320 Approval Label eeseeeseeeeeeeeeeeeen eene enemies enne nnne tenen nnr inneren nnne 6 Figure 9 RXT 320 Wireless Transceiver w Battery Assembly and Mounting Dimensions 8 Figure 10 RXT 320 Wireless Transceiver Remote Mounting eese 9 Figure 11 Wiring Diagram for Remote RXT 320 Transceiver Mounting eene 10 Figure 12 Internal Alarm Output Circuit eese eene ene nennen ner enne enne entree 14 Figure 13 Up to two Sensors using two 4 20mA Interfaces eeeseseeseeeseeeeee eene nennen 14 Figure 14 Model 100 Terminal Board Rotary SWitChesS ooooonnnccnnonnonanconcccnnnncnnnnononaconnnonnnnnnnnc cora cranncannna nn 15 Figure 16 Modbus Frame Format s orinario a nen enne enn en thes eterne nn near rana ne ne
30. er 8204 There are two bits in this sixteen bit register pertaining to the battery Battery Detect bit 6 lowest bit is 0 and Battery Fault bit 7 Both bits default to a value of 0 Battery Detect will be set once the first read of the battery over the PC interface was successful Battery Fault will be set if a battery was detected but the last read failed Battery Fault is re evaluated upon every read of the battery which is set to approximately every 5 seconds Register 8206 PC Batt Read Fails will increment by 4 each time there is a failure since there are 4 attempts before declaring failure This register can be cleared by writing a O to it at any point Once the battery has been detected the controller can read the battery life registers 8199 and 8200 The battery adjusts these values based upon the average current usage If this usage varies widely over time it will take some time to re adjust the battery life readings For instance an Alarm Station with no alarms will consume a very small amount of battery but when Alarms are active this will jump to a much higher level of usage So in this case battery life may go from several weeks down to several hours The battery life is presented in two forms life remaining in percentage register 8199 and life remaining in minutes register 8200 The battery Life remaining is percentage is a value between O and 100 and battery life in minutes is an unsigned value between O and 65535 Both readi
31. eren nnns 19 List of Tables Table 1 Extension Cable Wire Identification eese nene enne nennen nennen entree 12 Table 2 RXT 320 Transceiver Wire Identification esses nene nennen 12 Table 3 Wire Gauge vs Distance oie nes eet cte e E Ru cene Heated cleat da Sene ORTA do 13 Table 4 Model 100 Terminal Board Jumper Settings sese nennen 15 Table 5 RXT 320 Addressing and Operational Modes esee eene 16 Table 6 Exception Codes iia yeas ro i eio ee hited th b e rite e ee ede iet ine 19 Table 7 RKT 320 Register Map euet tet e Tel tr ida 21 Table 8 RXT 320 Secondary Alarm Output Register Map eese een nennen 21 RXT 320 Wireless IM iv a detcon inc RXT 320 Wireless Modbus 1 0 Introduction 1 1 Description The RXT 320 wireless transceiver is designed to take Modbus communication between devices to a wireless platform The transceiver connects directly to a Modbus device and transfers Modbus data to from the device through the transceiver s wireless radio The transceiver broadcasts this information throughout a wireless network of other RXT 320 transceivers connected to Modbus devices thus creating a seamless network of Modbus devices that need not be physically connected in any way The RXT 320 transceiver can be mounted to a J Box condulet with an optional Model 100 Terminal Board that allows for power data connections and addre
32. gauge voltage current and temperature monitoring circuits This smart circuitry continuously monitors the battery s condition and reports critical status information to the wireless transceiver via the Modbus registers The battery pack is designed to plug onto an 8 pin Beau connector on the Model 100 Terminal Board and should not be exposed to outside elements without being housed and protected Only Detcon products specifically designed to utilize these battery packs should be used Operating periods before recharge will vary based on devices attached along with the transceiver and the usage of those devices but can be as long as 2 3 months and battery life can be up to 5 years before battery pack replacement is required Improper use of the battery pack may be hazardous to personnel or the environment and will void the warranty t Figure 5 Smart Battery Pack NOTE The RXT 320 wireless transceiver can also be powered by a customer provided external DC power source Refer to section 2 3 1 for more details RXT 320 Wireless IM Rev 2 1 Page 4 of 27 detcon ine RXT 320 Wireless Modbus 1 5 Quad Battery Charger Optional Detcon s Smart Battery Pack can be charged as needed using Detcon s optional Quad Battery Charger which can charge up to four battery packs at one time The Quad Battery Charger comes with a plug in AC DC adapter that plugs into a standard 120V AC outlet for power The DC end of the adapter plugs into the D
33. ices As with normal Modbus operation there can only be one Modbus master and all other devices are considered as slave devices Each device must have a unique Modbus address Each transceiver is also assigned a Modbus address via the Model 100 Terminal Board which has two rotary switches used to set the address The Modbus master unit s transceiver is responsible for broadcasting requests and receiving slave device responses Slave device transceivers receive these broadcasts and pass the Modbus information on to the slave devices attached via their local Modbus interface When a response is generated by the slave device it sends it back to its transceiver through the Modbus interface The transceiver then broadcasts that RXT 320 Wireless IM Rev 2 1 Page 1 of 27 a detcon Inc RXT 320 Wireless Modbus information back to the master unit s transceiver which then places that information on the bus for the master unit Modbus Master B R3 Control Unit Modbus Slave Devices Figure 2 Typical Wireless Layout The transceiver provides for the following features connectivity e Modbus Interface Master or Slave connection for up to 32 Modbus devices on the network e Wireless Radio IEEE 802 15 4 Mesh Topology 16 RF channels DSSS encoding 2 4GHz e 4 20mA Inputs Tw
34. imeout and continue with the next transaction 4 1 1 Modbus Exceptions The RXT 320 is capable of returning Modbus exceptions when it cannot service a Modbus request meant for that RXT 320 By default this is turned off since it can cause issues with some controllers that do not process Modbus exceptions The following exception codes are supported and returned when Modbus exceptions are enabled Table 6 Exception Codes Exception Code 01 Illegal Function Name Meaning Unsupported function code Only 03 06 and 16 are supported The registers being requested falls only partially within the valid RXT 320 register ranges For example the RXT 320 registers start at 8192 If an access is perform requesting registers 8191 to 8192 then this is an Illegal Data Address since 8191 does not fall completely within the valid register range This would not be an exception though if register address 8190 to 8191 were used this would be passed on to the Modbus M interface for a local device to respond 02 Illegal Data Address There are other exception codes defined in Modbus but these are the only ones returned by the RXT 320 RXT 320 Wireless IM Rev 2 1 Page 19 of 27 a detcon inc RXT 320 Wireless Modbus 4 1 2 Modbus Broadcast Requests The Modbus broadcast request was introduced in the RXT 320 to support commands to be executed across all RXT 320 transceivers simultaneously More spe
35. lls within the RXT 320 internal registers the transceiver will not translate The transceivers RXT 320 registers will be accessible and it will respond back to the controller over the RF network without ever having put any data on the transceivers Modbus interface Any sensors connected to the transceiver would never see the request 3 4 Slave Configuration with Alarm Station Another function of the RXT 320 wireless transceiver is as an alarm output device when connected to an alarm station Each RXT 320 provides up to four alarm outputs Alarm 0 Alarm 1 Alarm 2 and Alarm 3 which can drive relays on custom terminal boards provided by Detcon or interposing relays provided by the customer These outputs are not intended to drive alarm devices directly due to their low current output but RXT 320 Wireless IM Rev 2 1 Page 17 of 27 a detcon inc RXT 320 Wireless Modbus TM rather to drive relay coils which in turn will drive a higher current output There are four RXT alarm output registers that become available when in alarm station mode The four alarm outputs are controlled by four internal registers within the RXT 320 and can be controlled on all RXT 320 transceivers by writing to these four registers using the Modbus address assigned that transceiver If the RXT 320 transceiver is assigned a Modbus address between 80h 8Fh there will be a duplicate set of four registers available to control the alarm outputs These are introduced
36. nd then into the 34 NPT hole of the T Outlet box connected to the J Box housing the Model 100 Terminal Board 13 Connect the cable wires to the 6 pin phoenix connector from step 3 per the wiring diagram in Figure 11 Reference Table 1 Extension Cable Wire Identification for color code identification 14 Reconnect the 6 pin phoenix connector back to J1 of the Model 100 Terminal Board and thread the 34 NPT cord connector to the T Outlet box NOTE Color coding of the cable will no longer match the color coding on the Model 100 Terminal Board for the J1 connector RXT 320 Wireless IM Rev 2 1 Page 11 of 27 detcon inc RXT 320 Wireless Modbus TM NOTE Programming of RXT transceiver from the Model 100 Terminal Board will be disabled 15 Plug battery pack back in place and reinstall the J Box cover from step 1 Table 1 Extension Cable Wire Identification Function Color Reference VDC Power Orange White VDC Return Green White Modbus A Blue White Modbus B White Blue Serial Clock SCL White Green Serial Data Line SDA White Brown Common Ground White Orange Common Ground Brown White Drain Wire Bare No Color 2 3 Wiring Connections Functions Dependant upon use and function the RXT 320 wireless transceiver can be wired in different ways to different devices It is important to insure that the wiring is correct for the device to operate properly Wire identification f
37. ngs are generally necessary to provide appropriate feedback to the user Life in minutes is the best for determining when to change the battery For example if the user wanted to be notified a day before the battery needed to be changed the user could set a threshold in the controller to be notified of low battery after 1440 minutes 1 day Since 65535 is the maximum value for life remaining in minutes this represents a maximum of 45 5 days The battery life for an application can be much greater than this value and will remain at a reading of 65535 until it drops below this Life in percentage was added for this reason Percentage will track starting at 100 percent and drop down as battery life decreases The controller can therefore use both registers one to represent usage in percentage to present to the user and then use the life in minutes to set a threshold on when a low battery condition exists for changing the battery 4 2 5 Register uC Version This is set to a value based upon the version of firmware programmed into the RXT 320 microcontroller It is stored as two byte value representing the major and minor revision numbers So a 0113h 275 decimal represents a major version of 01 and minor version of 13 As software is updated this will be incremented appropriately 4 2 6 Register Sleep Time The Sleep Time represents the amount of time in seconds the RXT 320 will be in a low power sleep state Its main purpose is to provide a mech
38. ntrols the Alarm 2 Output 8196 R W Alarm 3 Output Controls the Alarm 3 Output 8197 R 4 20mA A Reading for 4 20mA Sensor Input A 8198 R 4 20mA B Reading for 4 20mA Sensor Input B 8199 R Battery Life Percent Battery Life remaining in 8200 R Battery Life Minutes Battery Life remaining in minutes 8201 R uC Version Micro Controller Firmware Version Major Minor 8202 R W Sleep Time Sleep Time in seconds 8203 R W Control RXT 320 Control register 8204 R Status Status 8205 R Battery Voltage Battery Voltage in millivolts 8206 R W I2C Batt Read Fails PC Battery Read failure count 8207 R W E Rog FC Rotary Switch Read failure count 8208 R Timestamp Secs High Time from Startup Seconds High 8209 R Timestamp Secs Low Time from Startup Seconds Low 8210 R Timestamp mSecs Time from Startup Milliseconds as o Reserved Reserved registers Table 8 RXT 320 Secondary Alarm Output Register Map Register Access Name Description 0000 R Detcon Type Detcon Register Type 03 for RL4 0001 R W Alarm 0 Output Controls the Alarm 0 Output 0002 R W Alarm 1 Output Controls the Alarm 1 Output 0003 R W Alarm 2 Output Controls the Alarm 2 Output 0004 R W Alarm 3 Output Controls the Alarm 3 Output 4 2 1 Register Detcon Type Both register maps include this Detcon Type and is a unique identifier of the type of device and associated register map A controller can therefore perform a search and determine what Detcon device
39. o inputs available to connect two 4 20mA sensors devices e Alarm Outputs 4 low current outputs capable of driving relays for audible visual alarms e Battery Operation Low Power Sleep and battery life available from Detcon Smart Battery Pack e Addressable For Modbus access to RXT 320 control and status set through term board e Multiple Modes Operational mode Transparent Master Slave Alarm Station based on address configuration 1 2 RXT 320 Wireless Radio The RXT 320 transceivers utilize radios based upon the IEEE 802 15 4 standard that operate at 2 4 GHz using DSSS encoding for robustness DSSS was initially used by the military to resist jamming but later was widely adopted for wireless implementations since it was robust in noisy environments DSSS transmits data across a wider frequency range than the actual frequency range required for the information This operation minimizes cross talk and interference from other transceivers and is less susceptible to noise from other sources The IEEE 802 15 4 defines 16 separate RF Channels that can be used in the 2 4 GHz range The default channel is 1 but can be change if there is RF interference or if there is an existing network using that channel Transceivers will only respond to other transceivers with the same RF Channel RXT 320 Wireless IM Rev 2 1 Page 2 of 27 detcon inc RXT 320 Wireless Modbus TM NOTE If there are multiple Modbus networks in the same vicinity each sys
40. or the transceiver can be found in Table 2 RXT 320 Transceiver Wire Identification Table 2 RXT 320 Transceiver Wire Identification Function Color Reference VDC Power Red VDC Return Black Modbus M A Blue Modbus B White Alarm 0 Brown Alarm 1 Orange Alarm 2 Violet Alarm 3 Gray 4 20mA A Green 4 20mA B Yellow Serial Clock SCL White Black Serial Data Line Data SDA White Brown Programming Data White Green Programming Clock White Blue Programming Reset White Violet 2 3 1 VDC Power amp VDC Return All RXT 320 wireless transceivers need to have DC power applied to the transceiver s red VDC power and black VDC return wires The power requirements for the transceiver are such that the DC voltage input range is 7 to 30 volts This power will normally be supplied by the device the transceiver is connected to but can come from alternate DC sources such as the optional Smart Battery Pack solar panel or external customer supplied DC source RXT 320 Wireless IM Rev 2 1 Page 12 of 27 a detcon inc RXT 320 Wireless Modbus TM If an external power source is installed the RXT 320 wireless transceiver requires two conductor connections for the power supply External DC power can be customer provided with an output voltage range between 7 to 30VDC or by Detcon s optional 24VDC solar charging panel Both of these alternatives will provide continuous operation of
41. s are present on a Modbus M system 4 2 2 Register Alarm Outputs There are four registers that control the four open collector Alarm Outputs A value of 0 written to these register will turn the Alarm Output off not grounded A value of 1 or non zero value will turn the Alarm Output on grounded If the secondary Alarm Output registers are enabled the registers are duplicated and writing to either set will turn on or off the Alarm Outputs The current value of the Alarm outputs can be read at any time The default value for all Alarm Outputs upon power up or reset is 0 RXT 320 Wireless IM Rev 2 1 Page 21 of 27 a detcon inc RXT 320 Wireless Modbus TM 4 2 3 Register 4 20mA Reading There are two 4 20mA inputs and their current value is stored in the 4 20mA A and B registers The value of these register will range between 0 to 2048 with 0 being OmA and 2048 being 20 48mA Therefore a 4mA input will read 400 and a 20mA input will read 2000 Any currents above 20 48mA will remain at 2048 since this is the maximum value for this register 4 2 4 Register Battery Info If a Detcon battery pack is connected to the RXT 320 transceiver there are five registers associated with information about that battery The RXT 320 utilizes the I2C interface to read battery status and only one Detcon battery pack can be read per RXT 320 The controller can determine if a battery is present by reading the Status Register regist
42. s can be enabled and the Alarm Outputs 2 and 3 can be used as indications of receive for Modbus or Wireless interfaces Each bit in the control register can control a particular function and should be read first then modify the bits needed and written back The default state of the register is 0 All reserved bits should always be set to a 0 when writing The listing below shows the bit assignments Bit 15 Reserved set to 0 Bit 14 Debug Rx Activity Status Alarm 2 Wireless Rx Alarm 3 Modbus Rx Bit 13 12 Reserved set to 0 Bit 11 Modbus Exceptions Enabled Bit 10 08 Reserved set to 0 Bit 07 Reset the microcontroller and wireless radio Bit 06 Reset the microcontroller Bit 05 00 Reserved set to 0 4 2 8 Register Status This register contains status of the RXT 320 and some of the bits have already been covered in the battery description These default to 0 upon reset The bit assignment and description are given below Bit 15 08 Reserved set to 0 Bit 07 PC Fault on last read of Modbus Address Switch Rotary Switch on Term Board Bit 06 Modbus Address Switch Detected Always set to a 1 when address set Bit 05 I2C Fault on last read of Battery Status Bit 04 Battery Detected Bit 03 Alarm Station address detected second set of Alarm Output registers available Bit 02 Slave RXT 320 Bit 01 Master RXT 320 controller attached to Modbus interface Bit 00 Reserved set to 0 4 2 9 Regis
43. ssing enabling it to interface with a wide range of devices Refer to Figure 1 for a typical wireless transceiver assembly RXT 320 Wireless Transceiver J Box w ape Model 100 Terminal Board 3 NPT T Outlet Box w Drain Figure 1 RXT 320 Wireless Transceiver Assembly The RXT 320 wireless transceiver provides interfaces for 4 20mA devices as well as Modbus devices There can be up to 32 devices total on a single wireless network and a transceiver can support more than one device Additionally there can be up to 32 RXT 320 transceivers in a single wireless network The RXT 320 transceiver s radio operates at 2 4GHz and conforms to non licensed radio frequency appliance usage around the world Wireless network integrity and security is accomplished using Direct Sequence Spread Spectrum DSSS wireless mesh technology Each transceiver is capable of functioning as a router or repeater for all other RXT 320 transceivers on the network This means that data between devices can hop through neighboring transceivers to communicate with each other thereby widening network access points This unique and innovative technology is designed to create a robust network that automatically routes around congestion and line of sight obstacles while improving throughput as the number of devices increases The RXT 320 transceiver comes equipped with an RS 485 port for communication with local Modbus dev
44. tem must reside on a different RF Channel to keep data from one appearing on the other The 802 15 4 standard also implements a mesh network allowing any RXT 320 transceiver to relay or repeat data between adjacent neighbors This makes the network very robust and provides the following immediate benefits Allows re routing of data in case of loss of a transceiver Allows re routing around wireless obstacles Longer distances between transceivers because data can hop from one transceiver to the next Included in sensor controller and alarm station transceivers RXT 320 transceivers can be deployed with less concern about physical location e Figure 3 Mesh Network Topology 1 3 Model 100 Terminal Board Optional The RXT 320 wireless transceiver can be ordered with an optional Model 100 Terminal Board mounted in a condulet J Box See Figure 4 The terminal board includes connector plugs for the following J1 6 Pin Phoenix Connector RXT 320 Wireless Transceiver J2 5 Pin Phoenix Connector Slave Device Master Controller Remote Monitor J3 6 Pin Connector RXT Programming Port Detcon Factory use only J4 3 Pin Phoenix Connector Model 100 Loop Powered LED display J5 3 Pin Phoenix Connector 7 30VDC External power source or 24VDC Solar Panel J6 8 Pin Beau Connector 12VDC Battery Power Use only Detcon s Smart Battery Pack J7 3 Pin Phoenix Connector Spare Modbus Connection J8 3 Pin Phoenix Connector
45. ter Address Switch The rotary switch on the Model 100 Termination board provides the Modbus address through the IC interface There is both an Address Switch Detect and Fault bit defined in the status register The rotary switch is read approximately every 5 seconds and the Fault bit is set if the last read failed Register 8207 D C Switch Read Fails will increment by 4 each time there is a failure since there are 4 attempts before declaring failure This register can be cleared by writing a 0 to it at any point RXT 320 Wireless IM Rev 2 1 Page 23 of 27 a detcon inc RXT 320 Wireless Modbus TM 4 2 10 Register Timestamp Three registers are utilized to maintain a timestamp that increments on the microcontroller after power up These are all set to 0 upon power up or a microcontroller reset The first two registers 8208 and 8209 are internally combined into a single 32 bit register and incremented each second The last register 8210 maintains the millisecond count and will count from 0 to 999 and start over again 5 0 Troubleshooting Guide Power Problems Probable Causes Depleted battery Low Charge battery not seated properly Recharge or replace battery Reseat battery Transceiver not Responding Probable Causes Incorrect jumper settings on term board incorrect wiring connectors not seated properly Verify jumper settings are properly configured Verify transceiver wiring matches color coding on term board Verify
46. ter Configuration with Controller The RXT 320 wireless transceiver can function as a master when connected to a controller by assigning it a Modbus address of FOh through the transceiver s Model 100 Terminal Board In this configuration the controller can send out requests and receive data status from slave devices over the wireless network through its Modbus interface to the transceiver The transceiver s local Modbus interface is set up to be a slave interface to the master controller which means the transceiver will act as a slave to the controller but be seen as the master globally Requests from the controller will be received by the transceiver through the Modbus interface and the transceiver will transmit the request over the RF network to all RXT 320 s If the slave device being commanded is found a response will be generated which will be received by the master transceiver over the RF network and sent back to the controller via the local Modbus interface 3 3 Slave Configuration with Sensor The RXT 320 wireless transceiver can also function as a slave when connected to a slave device sensor by assigning it a Modbus address that is not equal to FOh controller or 00h transparent mode This Modbus addressing will affect how the slave RXT 320 deals with the request it receives In this configuration the transceiver can receive requests and send out data status over the wireless RF network The transceiver s local Modbus
47. w either AC or DC Battery operation with the relays built onto the board These boards RXT 320 Wireless IM Rev 2 1 Page 13 of 27 a detcon inc RXT 320 Wireless Modbus provide a complete solution to connecting an RXT 320 to power and providing high current relay closures When using interposing relays it is strongly recommended to install a transient protection diode 1N4001 across the relay coil to mitigate the voltage spike when the coil is de energized RXT 320 Interposing Relay Alarm Output 1N4001 5 Relay Diode lt i MOSFET N CH i 3 e From RXT 320 50V 300mA 444 b Processor Output V LN AY AU 49 9K Figure 12 Internal Alarm Output Circuit NOTE External relays used with this circuit must not exceed voltage current requirements and must have transient protection to minimize the voltage spike when the coil is de energized 2 3 4 4 20mA A amp B The RXT 320 supports up to two 4 20mA signal inputs A and B used for monitoring 4 20mA devices See Figure 13 For the primary 4 20mA signal input use A green wire For the secondary 4 20mA signal input use B yellow wire The input values are continuously read and stored in two separate registers accessible through Modbus at the address assigned to the transceiver Readings on a 4 20mA input are converted to representative values for example 4mA is read as a value of 400 and 20mA is read as a value of
48. y cause the transceiver to become inoperative The following table describes the jumper positions Table 4 Model 100 Terminal Board Jumper Settings Jumper Setting JP1 2 3 JP2 1 2 JP3 1 2 JP4 1 2 JP5 2 3 JP6 1 2 JP7 1 2 NOTE These settings assume the RXT 320 is not being used with a Detcon Model 100 sensor If the RXT 320 is being used with a Model 100 sensor these jumper settings may be different Please refer to the appropriate Model 100 manual for the correct settings The Model 100 Terminal Board also contains two rotary switches which are used to set the Modbus address for the RXT 320 wireless transceiver The address selected is a two digit hex value with the MSD most significant digit represented by the top rotary switch closest to the J1 connector and the LSD least significant digit represented by the bottom rotary switch closest to the J2 connector For example a hex value of 9F would be represented by a 9 on the top switch and an F on the bottom switch Figure 14 Model 100 Terminal Board Rotary Switches RXT 320 Wireless IM Rev 2 1 Page 15 of 27 RXT 320 Wireless Modbus TM detcon inc NOTE If using a Smart Battery Pack battery pack removal is required to access the rotary switches for Modbus addressing and to access the board jumpers Assigning a Modbus address to the transceiver allows registers within the transceiver itself to
Download Pdf Manuals
Related Search