USER MANUAL
Contents
1. Copyright 1997 Patton Electronics Company All Rights Reserved2. Asynchronous Full half duplex AC power not required derives approximately 3mA from RS 232 data and control voltages Compliant with IEC 801 5 level 2 1kV Model 222NS Only DCE data is received from the remote short range modem via RX and RX and is sent to the DTE from the Model 222N via pin 3 of the RS 232 interface the RS 232 interface is the DB 25 connector closest to the DTE DCE switch 2 20 x 1 75 x 75 11 APPENDIX B PATTON MODEL 222N CABLE RECOMMENDATIONS The Patton Model 222N operates at frequencies of 20kHz or less and has been performance tested by Patton technicians using twisted pair cable with the following characteristics Wire Gauge Capacitance Resistance 19 AWG 9mm 83nf mi or 15 72 pf ft 0163 Ohms ft 22 AWG 6mm 83nf mi or 15 72 pf ft 0326 Ohms ft 24 AWG 5bmm 83nf mi or 15 72 pf ft 05165 Ohms ft To gain optimum performance from the Model 222N please keep the following guidelines in mind Always use twisted pair wire this is not an option Use twisted pair wire with a capacitance of 20pf ft or less Avoid twisted pair wire thinner than 26 AWG i e avoid higher AWG numbers than 26 Use of twisted pair with a resistance greater than the above specifications may cause a reduction in maximum distance obtainable Functionality should not be affected Environmental factors too numerous to mention can affect the maximum distances obtainable at a particular
3. ISO yo An ISO 9001 Certified Company USER MANUAL MODEL 222N and 222NS Miniature RS 232 to RS 422 Converters pa PATTON Ba FlectronicsTo Part 407M222N C Doc 023022UC Revised 9 8 97 1 1 RADIO AND TV INTERFERENCE The Model 222N 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 222N 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 222N 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 Compatibility
4. EMC directive and the Low Voltage Directive LVD of the Union European EU A Certificate of Compliance is available by contacting Patton 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 4 FEATURES Bi directionally converts RS 232 signals to balanced RS 422 DCE DTE switch selectable on RS 232 interface Supports transmit and receive data X ON X OFF flow control Loops back all handshaking signals on the RS 232 interface Very thin case 75 for closely spaced computer ports No AC power or batteries required draws all necessary operating power from RS 232 interface Supports data rates to 19 200 bps 2 2 DESCRIPTION The Patton Model 222N interface converter allows computers terminals and modems employing the RS 232E interface to communicate with devices using RS 422 balanced electrical signals This unit derives the necessary power for operation from the data and control voltages on the RS 232 interface The 222N features bi directional data conversion at full or half duplex at distances up to 3 5 miles An external DCE DTE switch lets you connect to the serial port of either a computer terminal DTE or a modem DCE without using a crossover cable The Model 222N is available with several RS 422 interface options DB 25 male or female following the
5. RS 530 standard RJ 11 RJ 45 or terminal blocks with strain relief The surge protected Model 222NS uses high speed avalanche diodes to intercept data line transient surges and shunt them safely to chassis ground Compliant with IEC 801 5 level 2 1kV the 222NS can protect itself and connected equipment from nearby lightning strikes and other surges of electromagnetic radiation 3 0 CONFIGURATION The Model 222N is designed to be easy to use There are no internal jumpers or DIP switches to set so there is no need to open the case to configure the unit you may need to open the case for wire connection refer to section 4 0 The only configuration necessary for operation is proper setting of the external DTE DCE switch The figure below shows the location of the DTE DCE switch on the PC board as well as the location of the terminal block and surge suppressors S model only DCE DTE Switch Surge L J Suppressors E IUHUUUEUUum 222NS only LN DCE JE DTE Terminal Block ee ee m di ODO 3 1 SETTING THE DTE DCE SWITCH For your convenience the Model 222N has an externally accessible DTE DCE switch see diagram below If the device connected to the Model 222N is a modem or multiplexer or is wired like one set the switch to DTE This setting causes the Model 222N to behave like Data Terminal Equipment and transmit data on pin 2 If the device connected to the Mo
6. color is negative Ultimately you will want to construct a two pair cross over cable that makes a connection with the RS 422 device as shown below Model 222N RS 422 Device XMT RCV 4 a s RCV RCV XMT ple XMT 6 If there is a shield around the telephone cable it may be connected to G on the terminal block To avoid ground loops we recommend connecting the shield at one end only A ground wire is not necessary for proper operation of the Model 222N 7 When you finish connecting the wires to the terminal block the assembly should resemble the diagram below LINX 9 AOu 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 about 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 LINX 9 AOH 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 then insert the captive scr
7. IN 1 no connection 2 G Ground 3 RCV Receive Data 4 XMT Transmit Data 5 XMT Transmit Data 6 lt 7 8 x O IG Gig Receive Data G Ground no connection NOTE Signals XMT and XMT are the EIA 422 A and B transmitters respectively Signals RCV and RCV are the EIA 422 A and B receivers respectively 13 14 APPENDIX D PATTON MODEL 222N BLOCK DIAGRAM Deng TA E 1 Eug 9 D DTE B 5 C O AI DCE 2d He 1 C 2 S T DTE o R NOTE Io g DATA TRANSMITTED DATA CLAMPED TO 2v p p SCHMITT TRIGGER SIGNAL FLOW THROUGH THE DB 25 IS SHOWN FOR THE MODEL 222N IN DCE MODE RTS CTS DSR lt D DTR POWER SUPPLY FG V 2 s ACTIVE FILTER AE OUTPUT SURGE 5 BUFFER PROTECTION Mine E R OUTPUT SURGE 4 BUFFER PROTECTION A d T MODEL 299NS ONLY 2 rex S e R SURGE 2 s PROTECTION REV p SURGE i PROTECTION Se ROV LINEISHELD NEGATIVE WITH RESPECT TO RCV WHEN NOSIGNALIS BEING RECEIVED PATTON ELECTRONICS Title MODEL 222N 222NS BLOCK DIAGRAM Size Document Number REN A QGAOg3BO1 O1 A Date July 24 1990 Sheet 1 of
8. del 222N is a PC terminal or host computer or is wired like one set the switch to DCE This setting causes the Model 222N to behave like Data Communications Equipment and transmit data on pin 3 DCE BH DTE 4 0 INSTALLATION Once you have properly configured the DTE DCE switch you are ready to connect the Model 222N to your system This section tells you how to properly connect the Model 222N to the RS 422 and RS 232 interfaces and how to operate the Model 222N 4 1 CONNECTION TO THE RS 422 INTERFACE The Model 222N supports data only communication distances up to 4000 feet between itself and the RS 422 device To function properly the Model 222N must have 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 222N is available with several different physical interfaces on the RS 422 side DB 25 following the RS 530 standard RJ 11 jack RJ 45 jack and terminal blocks with strain relief 4 1 1 RS 422 CONNECTION USING THE DB 25 The DB 25 connector on the Model 222N s RS 422 side conforms to the RS 530 interface standard See Appendix C When connecting to an RS 422 device that also conforms to the RS 530 standard your cable should be crossed over in the manner shown below MODEL 222N RS 422 530 DEVICE SIGNAL DB 25PIN DB 25 PIN SIGNAL XMT Bites ahi et
9. e 3 RCV XMT 14 tute 16 RCV RCV Sieh een 2 XMT RCV 16222 aaa sanhi 14 XMT The DB 25 connector that is farthest from the DTE DCE switch NOTE It is not necessary that the RS 422 device adhere to the RS 530 standard However you must make sure that the signals polarities and pairing of your connection conform to the above diagram 4 1 2 RS 422 CONNECTION USING RJ 11 OR RJ 45 The RJ 11 and RJ 45 connectors on the Model 222N s RS 422 side are pre wired for a standard TELCO wiring environment The signal pin relationships are shown below RJ 11 SIGNAL RJ 45 SIGNAL aaa nata GND Tues N C Dite RCV D gioia GND Sio eme XMT S scena RCV Ad ss isthe aks XMT Ad usi XMT Bude RCV Dieses te XMT Oi E EE GND Onounsem RCV Dy inating GND S osos N C In most modular RS 422 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 222N and the RS 422 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 222N RS 422 DEVICE SIGNAL PINZ COLOR COLOR PIN 422 SIGNAL GNDt 1 Blue N C RCV 2 Yellow Red 4 XMT XMT 3 Green Black 5 RCV XMT 4 Red Yellow 2 RCV RCV 5 Black Green 3 XMT GNDt 6 White N C Connection to ground is optional 1 Bl
10. ew 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 2 CONNECTION TO THE RS 232 INTERFACE Once you have configured the Model 222N for DTE or DCE and connected the twisted pair wires correctly simply plug the 222N directly into the DB 25 port of the RS 232 device After doing so remember to insert and tighten the two captive connector screws NOTE If you must use a cable to connect the Model 222N to the RS 232 device make sure it is a straight through cable of the shortest possible length we recommend 6 ft or less 4 3 OPERATING THE MODEL 222N Once the Model 222N 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 422 interfaces are passed straight through All control signals from the RS 232 interface are looped back NOTE If your system requires hardware flow control you will need the Patton Model 285 RS 232 to RS 485 converter Call Patton Customer Service at 301 975 1007 10 APPENDIX A PATTON MODEL 222N SPECIFICATIONS Date Rates Transmission Format Transmission Mode Power Surge Protection Factory Switch Setting Dimensions 19 200 bps according to the RS 232 interface
11. site Use maximum distance figures as a general guideline only 12 APPENDIX C PATTON MODEL PIN ASSIGNMENTS EIA 232 Interface DB 25 Connector DIRECTION STANDARD DCE SETTING DIRECTION To Model 222N 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 Data Term Ready DTR 20 DCD Data Carrier Detect To Model 222N From Model 222N To Model 222N From Model 222N From Model 222N From Model 222N DIRECTION From Model 222N STANDARD DTE SETTING FG Frame Ground TD Transmit Data RD Receive Data RTS Request to Send CTS Clear to Send SG Signal Ground Data Term Ready DTR 20 DCD Data Carrier Detect DIRECTION From Model 222N To Model 222N From Model 222N To Model 222N To Model 222N To Model 222N APPENDIX C PATTON MODEL PIN ASSIGNMENTS EIA 422 EIA 530 Interface DB 25 Connector SIGNAL PIN SIGNAL PIN Transmit Data XMT 14 2 XMT Transmit Data Receive Data RCV 16 3 RCV Receive Data EIA 422 Interface RJ 11 Female Connector RJ 11 6 Pin SIGNAL PIN 1 Q Ground 2 RCV Receive Data 3 XMT Transmit Data 4 XMT Transmit Data 5 RCV Receive Data 6 G Ground EIA 422 Interface RJ 45 Female Connector RJ 45 8 Pin SIGNAL P
12. ue 1 Blue 2 Orange 2 Yellow 3 Black 3 Green 4 Red 4 Red 5 Green 5 Black 6 Yellow 6 White 7 Brown 8 Slate Standard AT amp T color codes yours may be different 4 1 3 RS 422 CONNECTION USING TERMINAL BLOCKS If your RS 422 application requires you to connect two pairs of bare wires to the Model 222N 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 fasten the strain relief collar in place so that the wires won t pull loose 1 Open the unit by gently inserting a screwdriver between the DB 25 connector and the lip of the plastic case see below You don t have to worry about breaking the plastic but be careful not to bend the D sub connector ELTE Le Once the unit has been opened you will be able to see the terminal blocks located at the rear of the PC board 2 Strip the outer insulation from the twisted pairs about one inch from the end C E 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
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