USER MANUAL
Contents
1. RCV RCV RCV XMT XMT RCV XMT XMT Figure 8 Daisy chain wiring for Model 2085 host and slaves 4 3 CONNECTION TO THE RS 232 INTERFACE Once you have properly configured the Model 2085 and connected the twisted pair wires correctly simply plug the Model 2085 directly into the DB 25 port of the RS 232 device Remember to insert and tighten the two captive connector screws Note If you must use a cable to connect the Model 2085 to the RS 232 device make sure it is a straight through cable of the shortest possible length we recommend 6 feet or less 4 4 OPERATING THE MODEL 2085 Once the Model 2085 is properly installed it should operate transparently as if it were a standard cable connection Operating power is derived from the RS 232 data and control signals there is no ON OFF switch All data signals from the RS 232 and RS 485 interfaces are passed straight through Additionally one hardware flow control signal is passed in each direction 15 APPENDIX A PATTON MODEL 2085 SPECIFICATIONS Transmission Format Data Rate Range RS 232 Interface RS 485 Interface Options Transmit Line Transmit Mode Control Signals RTS CTS Delay Carrier Surge Protection Power Temperature Humidity Size Asynchronous Up to 115 200 bps Up to 9 miles DB 252. ISO w Ariniky An ISO 9001 Certified Company USER MANUAL MODEL 2085 High Speed RS 232 to RS 485 Interface Converter pE PATTON Ei Elecironics To Part 07M2085 D Doc 047033UD Revised 4 15 97 1 1 RADIO AND TV INTERFERENCE The Model 2085 generates and uses radio frequency energy and if not installed and used properly that is in strict accordance with the manufacturer s instructions may cause interference to radio and television reception The Model 2085 has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules which are designed to provide reasonable protection from such interference in a commercial installation However there is no guarantee that interference will not occur in a particular installation If the Model 2085 does cause interference to radio or television reception which can be determined by disconnecting the RS 232 interface the user is encouraged to try to correct the interference by one or more of the following measures moving the computing equipment away from the receiver re orienting the receiving antenna and or plugging the receiving equipment into a different AC outlet such that the computing equipment and receiver are on different branches 1 2 CE NOTICE The CE symbol on your Patton Electronics equipment indicates that it is in compliance with the Electromagnetic Compa
3. DTR 20 DCD Data Carrier Detect From Model 2085 To Model 2085 From Model 2085 To Model 2085 To Model 2085 To Model 2085 Copyright Patton Electronics Company All Rights Reserved
4. Off Echo Off 1 5 Carrier Control Method The setting for switch S1 5 determines whether the carrier is Constantly On or Controlled by RTS This setting allows for operation in switched carrier multipoint and or hardware handshaking applications 1 5 Setting On Controlled by RTS Off Constantly On S1 6 Receive Impedance The setting for switch S1 6 selects the impedance of the input receiver You may select either a low impedance of 120 Ohms or a high impedance of 16 kKOhms By selecting the proper impedance for each drop there may be up to 50 receivers in one application S1 6 Setting On Low 120 Ohm Off High 16 kOhm typical S1 7 and S1 8 2 Wire 4 Wire Modes Switches S1 7 and S1 8 are set together to determine whether the Model 2085 is in 2 wire or 4 wire operating mode Note 2 wire mode is half duplex only 1 7 1 8 Setting On On 2 wire mode Off Off 4 wire mode 7 3 4 CONFIGURATION SWITCH APPLICATIONS The switch settings generally needed to configure the Model 2085 for various applications are shown in the table below Note Do not change switch settings until you have carefully read Section 3 3 TYPICAL MODEL 2085 APPLICATIONS Switch Point to Point Multi point Settings 4w 4W HDX 2W 4w 2W S1 1 Xmt Off Imp OFF OFF OFF OFF OFF S1 2 Xmt Off Imp OFF OFF OFF OFF OFF S1 3 RTS CTS Delay ON ON ON OFF ON S1 4 Echo OFF OFF OFF OFF OFF 1 5 Carrier Con
5. DIP switch showing ON and OFF positions O Z 3 1 SETTING THE DCE DTE SWITCH For your convenience the Model 2085 has an externally accessible DCE DTE switch If the device connected to the Model 2085 is a modem or multiplexer or is wired like one set the switch to DTE This setting causes the Model 2085 to behave like Data Terminal Equipment and transmit data on pin 2 If the device connected to the Model 2085 is a PC terminal or host computer or is wired like one set the switch to DCE This setting causes the Model 2085 to behave like Data Communications Equipment and transmit data on pin 3 3 2 DIP SWITCH CONFIGURATION The eight switches on switch set S1 see Figure 3 above configure the Model 2085 for echo mode carrier control method RTS CTS delay transmit off impedance receive impedance and 2 wire 4 wire operation These switches are located internally on the Model 2085 s PC board To access switch set S1 use a small flat blade screwdriver to pop open the Model 2085 s case as shown in Figure 4 below Figure 4 Opening the Model 2085 s plastic case with a small screwdriver 3 3 DIP SWITCH SETTINGS All possible settings for the Model 2085 s configuration switches are presented in Figure 5 below Following Figure 5 is a detailed description of each switch function If you have additional questions contact Technical Support at 301 975 1000
6. S1 SUMMARY TABLE Position Function Factory Default S1 1 Transmit Off Impedance Off High Z S1 2 Transmit Off Impedance Off 1 3 RTS CTS Delay On 8 msec 1 4 ECHO Mode Off Echo Off 1 5 Carrier Control On RTS Cont 1 6 Receive Impedance On 120 Ohm 1 7 2 Wire 4 Wire On 2 Wire S1 8 2 Wire 4 Wire On Figure 5 Summary of DIP switch default settings for set S1 Note Switches S1 1 amp S1 2 should be switched simultaneously Switches S1 7 amp S1 8 should also be switched simultaneously 1 1 and S1 2 Transmit Off Impedance Switches S1 1 and S1 2 are set together to determine whether the receiving device sees the impedance of the Model 2085 s transmitter as being high or intermediate when the transmitter is turned off The intermediate setting is useful in half duplex environments where the receiving device does not respond well to the high setting S1 1 S1 2 Setting On On Intermediate Impedance Off Off High Impedance S1 3 RTS CTS Delay The setting for switch S1 3 determines the amount of delay between the time the Model 2085 sees RTS and when it sends CTS Note RTS CTS Delay setting should be based upon transmission timing 1 3 Setting On 8 mSec Off no delay S1 4 Echo Mode The setting for switch S1 4 determines whether the Model 2085 echoes data back to the transmitting device half duplex mode only 1 4 Setting On Echo On
7. a star or daisy chain topology Both topologies require special wiring as well as specific DIP switch settings for master and slave units Note Refer to Section 3 2 2 for multipoint DIP switch settings 4 2 1 STAR TOPOLOGY Using a star topology you may connect several Model 2085s together in a master slave arrangement Maximum distance between the units will vary based upon the number of drops data rate wire gauge etc Call Technical Support for specific distance estimates Figure 7 below shows how to wire the two pair cables properly for a Model 2085 star topology Note that the ground connection is not needed HOST FIRST SLAVE SECOND SLAVE XMT RCV ie oer ae eh eer ae een RCV XMT RCV Cie eee eee RCV RCV XMT VORNE aoe cet oteseds XMT RCV p XMT eS ie eae re eee XMT Figure 7 Star wiring for Model 2085 host and slaves 14 4 2 2 DAISY CHAIN TOPOLOGY Using a daisy chain topology you may connect several Model 2085s together in a master slave arrangement Maximum distance between the units will vary based upon the number of drops data rate wire gauge etc Call Technical Support for specific distance estimates Figure 8 below shows how to wire the two pair cables properly for a Model 2085 daisy chain topology Note that the ground connection is not needed HOST FIRST SLAVE OTHER SLAVE S XMT RCV RCV XMT
8. male or female DCE DTE switchable DB 25 male or female RJ 11 or RJ 45 jack terminal block with strain relief 2 4 wire unconditioned twisted pair 4 wire full or half duplex 2 wire half duplex DSR turns ON immediately after the terminal raises DTR DCD turns ON after recognizing the receive signal from the line CTS turns ON after the terminal raises RTS 8 mSec or no delay The carrier is switch selected either continuous operation or switched operation controlled by RTS 600W power dissipation at 1 mS Draws operating power from RS 232 data and control signals no AC power or batteries required 0 to 50 C 5 to 95 non condensing 2 66 x 2 10 x 0 73 16 APPENDIX B PATTON MODEL 2085 RS 232 PIN CONFIGURATIONS DIRECTION DCE SETTING DIRECTION To Model 2085 1 FG Frame Ground 2 TD Transmit Data 3 RD Receive Data 4 RTS Request to Send 5 CTS Clear to Send 6 DSR Data Set Ready 7 SG Signal Ground 8 DC Data Term Ready DTR 20 D Data Carrier Detect To Model 2085 From Model 2085 To Model 2085 From Model 2085 From Model 2085 From Model 2085 DIRECTION DTE SETTING DIRECTION From Model 2085 FG Frame Ground TD 1 2 TD Transmit Data 3 RD Receive Data 4 RTS Request to Send 5 CTS Clear to Send 6 DSR Data Set Ready 7 SG Signal Ground 8 Bata Tenn Ready
9. may be set to constantly on or controlled by RTS and the unit can operate with or without echo RTS CTS delay may be set for no delay or 8 mS The Model 2085 is equipped with either male or female DB 25 for RS 232 connection Options for twisted pair connection include terminal blocks with strain relief RJ 11 RJ 45 and DB 25 male or female Silicon Avalanche Diodes provide 600 watts per wire of protection against harmful data line transient surges 3 0 CONFIGURATION The Model 2085 is configured using an eight position DIP switch and a DCE DTE switch Figure 1 below shows the location of the DCE DTE switch externally accessible on the PC board as well as the power supply daughter board and terminal block DCE DTE Switch r p Figure 1 Top view of Model 2085 board showing DCE DTE switch OOOO Terminal Block Figure 2 below shows the location of the eight position DIP switch on the underside of the Model 2085 PC board Figure 3 following page shows the orientation of the eight position DIP switch with respect to ON OFF positions DIP Switch S1 a Figure 2 Bottom view of Model 2085 board showing internal DIP switch EEEE ON Saadun OFF Figure 3 Close up of
10. standard However you must make sure that the signals polarities and pairing of your connection conform to the above diagram 4 1 2 4 WIRE CONNECTION USING RuJ 11 OR RJ 45 The RJ 11 and RJ 45 connectors on the Model 2085 s RS 485 side are pre wired for a standard TELCO wiring environment The signal pin relationships are shown below RJ 11 SIGNAL RJ 45 SIGNAL A EEEE SE GND Tih ak tate N C PE EEEE RCV 2ean GND F E XMT SEE EEE RCV Fess isthe aks XMT Acide i Busines XMT Ba se P RCV Dieses te XMT Oi EE EE GND Oiana RCV T ineiniateeis GND to E N C Connection to ground is optional OnkWNM ONMDURWMY In most modular RS 485 applications it is necessary to use a cross over cable The diagram below shows how a cross over cable should be constructed for an environment where both the Model 2085 and the RS 485 device use a 6 wire RJ 11 connector Similar logic should be followed when using RJ 45 connectors or a combination of the two MODEL 2085 RS 485 DEVICE SIGNAL PIN PIN RS 422 SIGNAL GND Pee N C RCV PES 4 XMT XMT eee 5 RCV XMT Beenie al 2 RCV RCV anne 3 XMT GND Go N C 10 4 1 3 4 WIRE CONNECTION USING TERMINAL BLOCKS If your RS 485 application requires you to connect two pairs of bare wires to the Model 2085 you will need to open the case to access the terminal blocks The following instructions will tell you how to open the case connect the bare wires to the terminal blocks and fas
11. ten the strain relief collar in place so that the wires won t pull loose 1 You should already have the case open for the configuration procedure If not open the case according to the diagram in Section 3 2 2 Strip the outer insulation from the twisted pairs about one inch from the end a 3 Strip back the insulation on each of the 2 twisted pair wires about 25 4 Connect one pair of wires to XMT and XMT transmit positive and negative on the terminal block making careful note of which color is positive and which color is negative 5 Connect the other pair of wires to RCV and RCV receive positive and negative on the terminal block again making careful note of which color is positive and which color is negative Ultimately you will want to construct a two pair cross over cable that makes a connection with the RS 485 device as shown below Model 2085 RS 485 Device 11 6 If there is a shield around the telephone cable it may be connected to G on the terminal block We recommend connecting the shield at the computer end only to avoid ground loops A ground wire is not necessary for proper operation of the Model 2085 7 When you finish connecting the wires to the terminal block the assembly should resemble the diagram below LINX 9 A9H 8 Place the 2 halves of the strain relief assembly on either side of the telephone wire and press together very lightly Slide the assembly so that it is abo
12. tibility EMC directive and the Low Voltage Directive LVD of the Union European EU A Certificate of Compliance is available by contacting Technical Support 2 0 GENERAL INFORMATION Thank you for your purchase of this Patton Electronics product This product has been thoroughly inspected and tested and is warranted for One Year parts and labor 2 1 FEATURES e Operates asynchronously point to point or multipoint over 2 or 4 wires e Up to 50 multipoint device drops in a polling environment Data rates to 115 2 Kbps e Passes transmit amp receive data one control signal each direction No AC power or batteries are required Variable high low impedance settings Able to operate with or without echo e Carrier can be set as constantly on or controlled by RTS Compact size 2 66 x 2 10 x 0 73 e Twisted pair connection via strain relief RU 11 or RJ 45 Silicon Avalanche Diode surge protection 2 2 DESCRIPTION The Model 2085 High Speed RS 232 to RS 485 Interface Converter provides exceptional versatility in a compact package Requiring no AC power or batteries for operation the Model 2085 supports asynchronous RS 232 data rates to 115 2 Kbps over one or two unconditioned twisted pair The Model 2085 passes one control signal in each direction and can handle up to 50 terminal drops in a multipoint polling environment The Model 2085 may be configured for high or low impedance operation carrier
13. trol OFF ON ON Master OFF ON Slaves ON 1 6 Rev Impedance ON ON ON Master ON Slaves OFF Last Slave ON 1 7 2 wire 4 wire OFF OFF ON OFF ON 1 8 2 wire 4 wire OFF OFF ON OFF ON 4 0 INSTALLATION Once you have properly set the configuration switches you are ready to connect the Model 2085 to your system This section tells you how to properly connect the Model 2085 to the RS 485 and RS 232 interfaces and how to operate the Model 2085 4 1 CONNECTION TO THE RS 485 INTERFACE To function properly the Model 2085 must have one or two twisted pairs of metallic wire These pairs must be dry unconditioned metallic wire between 19 and 26 AWG the higher number gauges may limit distance somewhat For your convenience the Model 2085 is available with several different physical interfaces on the RS 485 side DB 25 following the RS 520 standard RJ 11 jack RJ 45 jack and terminal blocks with strain relief 4 1 1 4 WIRE CONNECTION USING THE DB 25 The DB 25 connector on the Model 2085 s RS 485 side conforms to the RS 530 interface standard When connecting to an RS 485 device that also conforms to the RS 530 standard your cable should be crossed over in the manner shown below MODEL 2085 RS 485 530 DEVICE SIGNAL DB 25 PIN DB 25 PIN SIGNAL XMT Bp dk RA 3 RCV XMT Dees Genco 16 RCV RCV ea eee 2 XMT RCV i eres 14 XMT NOTE It is not necessary that the RS 485 device adhere to the RS 530
14. ut 2 inches from the terminal posts and press together firmly If your cable diameter is too small or too large for our strain relief please contact our technical support We have strain relief assemblies to accommodate most cable diameters W LWX 9 A9H continued 12 9 Insert the strain relief assembly with the wire going through it into the slot in the bottom half of the modem case and set it into the recess in the case 10 BEND the top half of the case as necessary to place it over the strain relief assembly Do not snap the case together yet 11 Insert one captive screw through a saddle washer and then insert the captive screw with the washer on it through the hole in the DB 25 end of the case Snap that side of the case closed Repeat the process for the other side This completes the cable installation process 4 1 4 2 WIRE CONNECTION Most RS 485 devices employ a two wire half duplex configuration When using this configuration be sure to first set the Model 2085 to two wire mode then use only the transmit XMT pair as shown on the following page 13 2085 SIGNAL RS 485 SIGNAL The above wiring pattern applies regardless of whether you are making the RS 485 connection via DB 25 RJ 11 RJ 45 or terminal blocks For specific wiring instructions please refer to the previous pages of Section 4 4 2 WIRING FOR MULTIPOINT CIRCUITS The Model 2085 supports multi point applications using either
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