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Summary of Contents for Patton electronics 222N
- Page 1 USER MANUAL MODEL 222N and 222NS Miniature RS-232 to RS-422 Converters C E R T I F I E D An ISO-9001 Certified Company...
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Page 2: General Information
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 RS-530 standard), RJ-11, RJ-45, or terminal blocks with strain relief. -
Page 3: 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. -
Page 4: Installation
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. - Page 5 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 1....GND* 1 ....N/C 2....RCV- 2 ....GND*...
- Page 6 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.
- Page 7 "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...
- Page 8 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.
- Page 9 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.
- Page 10 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).
- Page 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.
- Page 12 From Model 222N 5- (CTS) Clear to Send To Model 222N 6- (DSR) Data Set Ready To Model 222N 7- (SG) Signal Ground From Model 222N Data Term. Ready (DTR) - 20 8- (DCD) Data Carrier Detect To Model 222N...
- Page 13 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 + 3- (RCV+) Receive Data + Receive Data - (RCV) - 16 EIA-422 Interface (RJ-11 Female Connector) RJ-11 (6 Pin) SIGNAL/PIN # 1 - (G) Ground...
- Page 14 APPENDIX D PATTON MODEL 222N BLOCK DIAGRAM Copyright © 1997 Patton Electronics Company All Rights Reserved...