model 222n
Contents
1. USER MANUAL MODEL 222N and 222NS Miniature RS 232 to RS 422 Converters pe PATTON BE TlectronicsTo 24 FEATURES Bi irectionally 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 extemal 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 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 With surge handling c2. apacity of 600W per wire at 1 mS 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 x surge Suppressors N 222NS only oce CEA ore Terminal Block ee co em pooo 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 Model 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 DoE CET DTE 4 0 INSTALLATION Once you have properly co
3. emble the diagram below 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 265 RS 232 to RS 485 converter Call Patton Customer Service at 301 975 1 007 APPENDIX A SPECIFICATIONS Date Rates 9 200 bps according to the RS 232 interface Transmission Format Asynchronous Transmission Mode Full halt duplex Power AC power not required derives approximately 3mA from RS 232 data and control voltages Surge Protection 600W surge power dissipation at 1 mS 1011 000uS waveform and response time of 1 pS Factory Switch Setting 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 Dimensions 2 20 x 1 75 x 75 APPENDIX B RS 232C PIN CONFIGURATIONS DIRECTION STANDARD DCE SETTING DIRECTION 1 1 Fram Ground 2 TD Transmit Data To Model 222N 3 RD Receive Data F
4. he 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 Once the unit has been opened you will be able to see the terminal blocks located a the rear of the PC board 2 Strip the outer insulation from the twisted pairs about one inch from the end 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 ot 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 422 device as shown below Model 222N RS 422 Device W POV XMT AON _XMT XMT 6 tf 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 the computer 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 res
5. ia 4 1 2 RS 422 CONNECTION USING RJ 11 OR RJ 45 The Fu and RJ 45 connectors on the Model 222N s RS 422 side are pre wired fora standard TELCO wiring environmenr The signal pin relationships are shown below Rutt IGNAL RJ 45 SIGNAL ih GND 1 aaa N C 2 RCV 2 GND 3 XMT 3 RCV 4 XMT 4 XMT ROV 5 sees XMT 6 ND 6 see ROVE Ty ww GND 8 NIC 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 PIN COLOR COLOR PIN 422 SIGNAL GND 1 Blue NG RCV 2 Yellow Red 4 XMT XMT 3 Green Black 5 RCV XMT 4 Red Yellow 2 RCV RCV 5 Black Green 3 XMT GND 6 White NC Connection toground is ep 1 pu pia 3 gape 3 en Rae A Green p yelow Hts Standard AT amp Tcolor 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 wilt 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 lo the terminal blocks and fasten the strain relief collar in place so that t
6. nfigured 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 stain 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 When connecting to an RS 422 device that also conforms to the RS 530 standard your cable should be crossed over inthe manner shown below MODEL 222N AS 422 530 DEVICE SIGNAL DB 25PIN DB 25 PIN SIGNAL XMT 2 3 RCV XMT 14 16 RCV RCV 3 2 XMT RCV 16 u XMT The DB 25 connector that is farthest tom 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 d
7. rom Medd 222N RTS Request to send To Model 2224 5 CTS Clear to send From Model 222N O59 Data Sa Ready From Modei 222 7 S0 Signal Ground kaano oa rda OH 20 amp DCD Data Carrier Detect From Model 222N DIRECTION STANDARD DTE SETTING DIRECTION FG FrameGround 2 TD Trasmit Data From Model 222N 3 RD Receive Data To Model 22N ERTS Request to Send Pom Modd 222N 5 CTS Clear to Send To Model 2 6 0SR Data StReady To Model 2220 H 7 S6 Serai Ground From Model222N Data Term Ready TR 20 a DCD Data Carrier Detect To Model 222N APPENDIX C BLOCK DIAGRAM WOHAMZZON ow wo vwa rz zam
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