Black Box ME800A User's Manual
Contents
1. Pin Number Signal Name Protective Ground Transmit Data Receive Data TD RD Receive Data Transmit Data RD TD Request to Send RTS Clear to Send CTS Data Set Ready DSR Signal Ground Carrier Detect CD Data Terminal Ready DTR O0 00 RO nv TD and RD can be reversed using the DTE DCE switch S1 on the circuit board See Section 3 3 for details 3 3 Switch Settings Refer to Figure 1 in this chapter Switch Sl is used to reverse the TD and RD lines on the EIA 232 interface This eliminates the need to swap these two lines in your EIA 232 cables If you connect the SHM B to your equipment using a straight through or 2 2 cable then S1 must be set to the opposite of your device s configuration For example if your device is configured as DTE select DCE on SI If you use a 2 3 or 3 2 cable to connect the SHM B to your equipment then the setting for S1 will be identical to your equipment s setting Refer to your equipment s manual for SHM B ASYNC information concerning its DTE DCE setting Table 2 gives the EIA 232 pinning of the SHM B with the DTE DCE switch in the DCE position Table 2 Pinning with DTE DCE switch in the DCE position PIN NUMBER SIGNAL NAME DIRECTION 1 Protective Ground 2 Transmitted Data TD To DCE 3 Received Data RD From DCE 4 Request to Send RTS To DCE 5 Clear to Send CTS From DCE 6 Data Set Ready DSR From DCE 7 Signal Ground 8 Received2. e BL ACK BOX ea rn pa ME800A ME800A R2 ME805 C ME805 C R2 ME810 Short Haul Modem B SHM B Async CUSTOMER SUPPORT INFORMATION Order toll free in the U S Call 877 877 BBOX outside U S call 724 746 5500 FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com M B ASYNC FEDERAL COMMUNICATIONS COMMISSION AND INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates uses and can radiate 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 communication It 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 against such interference when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus
3. no DTEs attached Check for reversal of polarity on the four wire connection BLACK BOX Copyright 2000 Black Box Corporation All rights reserved 1000 Park Drive Lawrence PA 15055 1018 724 746 5500 e Fax 724 746 0746
4. DIS PosITION If X ON X OFF characters are used for handshaking control rather than hardware logic levels move the RTS DTR control jumper to the DIS position Typically units that use software X ON X OFF flow control do not want RTS to affect DCD on the remote SHM B Moving the jumper to the DIS position disables the RTS DCD relationship The only thing that will force DCD low with the jumper in the DIS position is the absence of power on the remote SHM B or a broken twisted pair wire 4 Operation After completing the wiring and configuration procedure slide the printed circuit card back into the case while pulling the data and power cables through the holes in the back panel The front panel will snap into the front of the case when the printed circuit board has been completely pushed to the back of the case Connect the SHM B to your equipment then plug the wall transformer into its power source Check the SHM B operation at both ends of the loop by pressing the LOOPBACK switch S2 TD RD RS 232 RS 232 RD TD TD RD RS 232 RS 232 RD TD SHM 1 in LOOPBACK mode SHM 2 in NORMAL mode Figure 3 Activating the LOOPBACK switch SHM B ASYNC When in loopback mode the switch button indicator will appear to the sender If a CRT terminal is connected to the SHM B typing characters on the keyboard should result in the same characters appearing on the CRT screen If no characters appear chec
5. does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of Industry Canada Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de classe A prescrites dans le R glement sur le brouillage radio lectrique publi par Industrie Canada NORMAS OFICIALES MEXICANAS NOM ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD Todas las instrucciones de seguridad y operaci n deber n ser le das antes de que el aparato el ctrico sea operado Las instrucciones de seguridad y operaci n deber n ser guardadas para referencia futura Todas las advertencias en el aparato el ctrico y en sus instrucciones de operaci n deben ser respetadas Todas las instrucciones de operaci n y uso deben ser seguidas El aparato el ctrico no deber ser usado cerca del agua por ejemplo cerca de la tina de ba o lavabo s tano mojado o cerca de una alberca etc El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en las instrucciones de operaci n Todo otro servicio deber ser referido a personal de servicio califica
6. u orificios de ventilaci n 18 Servicio por personal calificado deber ser provisto cuando A El cable de poder o el contacto ha sido da ado u B Objectos han ca do o l quido ha sido derramado dentro del aparato o C El aparato ha sido expuesto a la lluvia o D El aparato parece no operar normalmente o muestra un cambio en su desempe o o E El aparato ha sido tirado o su cubierta ha sido da ada SHM B ASYNC TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners SHM B ASYNC 1 Specifications Transmission Data Rate bps Distance miles km 19 200 1 1 6 9600 2 3 2 4800 3 4 8 2400 4 6 4 NOTE The above specifications are valid for 24 or 26 AWG unshielded twisted pair telephone cable insulated by polyethylene with a mutual capacitance of 0 083 uf mile Shielded twisted pair cable will reduce the distance to one third of the table value due to the additional capacitance contributed by the cable s shielding Actual distances may vary depending on your specific operating equipment and the cable you use Protocol Asynchronous Operation 4 wire full duplex point to point Line Interface Balanced current loop Receive lines are protected through optical isolators rated at 1500 volts Equipment Interface EIA 232 CCITT V 24 interface with a hardware handshake selected through use of an internal strap Car
7. you have verified a problem with the twisted pair cable SYMPTOM Occasional data errors 1 The transmission distance bps data rate capability rate may have been exceeded Refer to Chapter 1 for information about valid data transmission distances and bps rates 2 There is a poor quality loop four wire circuit Try using a different four wire circuit or rewire the existing circuit SHM B ASYNC 3 Check the path of your four wire circuit for potential sources of interference fluorescent lighting electrical motors etc Such sources of electrical noise can provide an environment in which unwanted signals are induced onto your four wire circuit Also check to see if an adjacent four wire cable carrying a separate data stream is creating crosstalk It may be that the data signal is jumping from the adjacent cable onto the four wire circuit between the two SHM B modems another type of induced signal While you are checking your cable for sources of noise and crosstalk check the cable for irregularities in the shield Also reconsider the cable s ratings for attenuation capacitance and impedance You may need to install a higher quality cable for your particular installation Your AC power source may be the culprit Check your AC power at the wall socket and confirm that it is within the range given in Chapter 1 SHM B ASYNC SYMPTOM TD or RD indicator is steadily on red with no data attempting to pass
8. 32 devices to communicate at distances of up to 4 miles and at data speeds of up to 19 200 bps In addition to the transmitter and receiver circuits the SHM B Async includes EIA 232 control line interfaces status monitor LEDs and a loopback switch The SHM B is available in both a standalone version ME800A and a rackmount version ME805 C Models ME800A R2 and ME805 C R2 include cables The SHM B is designed to operate over a 4 wire metallic circuit Optimum performance is obtained with twisted pair cable see specifications Most types of twisted pair cable may be used often with little or no performance degradation The SHM B Async is designed for maximum operator safety There are no voltages greater than 12 VDC or 16 VAC present on the circuit board of the unit The Receive lines are protected from potential ground differences through optical isolators rated at 1500 volts 3 Installation Installation involves three basic steps four wire connections EIA 232 connection switch settings 3 1 Four Wire Connections Figure 1 shows the location of the terminal block on the circuit board Refer to Figure 2 to make the proper connections between two SHM B units NOTE Transmit TX on one modem is wired to Receive RX on the other modem Transmit TX is wired to Receive RX A ground connection is optional 1 Ifthe unit is assembled separate the top and bottom panels at the front of the unit 2 Pus
9. Line Signal Detector From DCE 20 Data Terminal Ready DTR To DCE Pins 2 and 3 TD and RD can be reversed using the DTE DCE switch S1 on the circuit board See Section 3 3 for details NOTE Configure each SHM B independently Your local and remote modems won t necessarily be configured the same SHM B ASYNC 3 4 Flow Control The SHM B uses a clever yet simple way to allow this unit to work with a broad line of equipment STANDARD EIA 232C HANDSHAKING RTS DTR CONTROL JUMPER IN EN POSITION The individual SHM B modems force their own DTR RTS CTS and DSR control lines HIGH gt 3V when The twisted pair wires are installed correctly Power is applied to both modems No computer devices are attached to the modems This forces DCD HIGH on the remote modem thus the remote modem knows to expect data In this state all systems are go The only way this state changes is if your equipment overrides this condition For example if your equipment drops DTR to a NEGATIVE signal your equipment s DTR being low will override the SHM B s DTR and DCD on the remote modem will go LOW SHM B ASYNC Because DTR DSR RTS and CTS are tied together internally dropping any one of these four signals to a negative state will also drop DCD on the remote side to a negative state DCD will also go LOW if the remote SHM B is powered down or if the twisted pair wire is broken X ON X OFF MODE RTS DTR CONTROL JUMPER IN
10. SHM B Rack to your rack CAUTION Do not attempt to use screws which are not countersunk as this will result in damage to the plastic front panel when it is installed Wire each SHM B board according to Figures 1 and 2 in this manual It is easiest to first feed all of the wires and cables through the rack Then you can make the necessary circuit board connections with the circuit boards positioned in front of the rack this allows for the SHM B ASYNC easiest access to the terminals switches etc After a SHM B Card is wired it can then be inserted into an open slot in the SHM B rack Be certain that the circuit board has mated with the power pins on the SHM B rack before applying force to fully seat the board otherwise you may damage the board and power pins When all boards have been wired and plugged into the rack plug the wall transformer into its power source You should be able to communicate as described in Chapter 4 When all channels are operating attach the SHM B Rack front panel by first aligning the plunger latches with their respective holes in the rack Press on the top and bottom of the panel to properly seat it then firmly press in all six of the plunger latches to retrain the panel 6 Troubleshooting Guide The following information will help you troubleshoot your installation if problems develop If your particular situation isn t listed here call Technical Support for assistance Have ready a desc
11. do El aparato el ctrico debe ser situado de tal manera que su posici n no interfiera su uso La colocaci n del aparato el ctrico sobre una cama sof alfombra o superficie similar puede bloquea la ventilaci n no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilaci n M B ASYNC 0 El equipo el ctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amplificadores que producen calor 1 El aparato el ctrico deber ser connectado a una fuente de poder s lo del tipo descrito en el instructivo de operaci n o como se indique en el aparato 2 Precauci n debe ser tomada de tal manera que la tierra fisica y la polarizaci n del equipo no sea eliminada 3 Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos poniendo particular atenci n a los contactos y recept culos donde salen del aparato 4 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 5 En caso de existir una antena externa deber ser localizada lejos de las lineas de energia 6 El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 7 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta
12. h the rear connector to force out the front panel and printed circuit board 3 Route the four wire cable through the open hole in the rear panel of the enclosure 4 Strip each of the four wires about SHM B ASYNC 5 Insert the wires into the terminal strip tighten the screw terminals 6 After you have made all four connections wrap the nylon cable tie packaged with the SHM B around the wires Pull the tie tight around the wires to secure them to the printed circuit board Trim the excess nylon tie with wire cutters or scissors J1 RS 232 CONNECTOR JUMPER O pnis RTS DTR CONTROL DTE DCE S2 LOOPBACK gt E Figure 1 SHM B board 5 screw terminal block SHM B ASYNC SHM 1 SHM 2 Figure 2 Wiring diagram for two SHM B units 3 2 EIA 232 Connection Connect the SHM B to your computer or terminal with a standard EIA 232 cable and DB25 connectors Refer to your equipment s installation manual if you need information on the exact EIA 232 signals required for your equipment Often it is best to use only the Transmit Data TD Receive Data RD and ground lines if your equipment does not require the use of the control signals Request To Send RTS Clear To Send CTS Data Set Ready DSR etc The SHM B generates levels for the control signals if you need to use them The table shows the pin connections at the SHM B SHM B ASYNC Table 1 EIA 232 Pin Connections on SHM B
13. it 3 Try a local test using the Loopback mode see Chapter 4 If there is no transfer check the setting of Sl and the wiring of your EIA 232 cable 4 The EIA 232 control signals are at the wrong levels Check the EIA 232 interface using a breakout box SHM B ASYNC Pins 4 5 6 8 and 20 should all be HIGH to enable communication 5 If pin 8 Carrier Detect is low this indicates a defective transmission line or connection a defective remote SHM B remote SHM B without power SYMPTOM TD and RD LEDs indicate data activity but data communication doesn t exist 1 Check the wiring of the EIA 232 port Refer to Section 3 2 for information 2 Check the setting of SI Refer to Section 3 3 for information SYMPTOM Transmitted and or received data is full of errors garbled data 1 Check for reversal of polarity on the four wire connection Refer to Section 3 1 and Figure 2 2 Check word structure and speed settings on your SHM B ASYNC computing equipment for consistency 3 Wire the SHM B units back to back eliminating the twisted pair see if you still have errors If you do have errors then test each SHM individually in the following way loopback one SHM s Transmit to Receive by using two short pieces of wire Connect that SHM to a dumb terminal and key in characters look for a good loopback A good loopback verifies a SHM B in proper working condition If you don t have errors
14. k your EIA 232 connections and the setting of S1 See Figure 3 for an illustration of the loopback mode The TD and RD LEDs on the front panel of your SHM B indicate the status of the SHM B transmitter and receiver respectively Green indicates a LOW EIA 232 level and red indicates a HIGH EIA 232 level The LEDs will modulate as data is transmitted and received by the SHM B Remember that these LEDs are monitoring the actual received and transmitted signals not the TD and RD lines of the EIA 232 interface When the loopback test is completed press the LOOPBACK switch again to return the SHM B to normal mode The switch button indicator should now be black Data transmission between the two modems will now be possible If you experience problems communicating between the two SHM Bs use Table 1 to help diagnose the problem SHM B ASYNC 5 Rackmount Installation The SHM B Async Card is a rack mount unit ME805 C that installs in a standard 19 inch panel rack You can use the SHM B Rack ME810 which can hold up to 16 cards The SHM B Async Card will occupy 5 25 inches of vertical rack space and is 9 inches deep To install the SHM B Rack first remove the acrylic front panel by pulling out the six plunger latches on the front of the panel then pulling on opposite side plungers to loosen and remove the panel Locate the four 10 32 Phillips head screws that were shipped with the SHM B Rack Use these screws to fasten the
15. rier Detect CD true high indicates operating short haul modem at the remote SHM B ASYNC end of the loop Interface is switch selectable for DTE DCE configuration pins 2 and 3 are reversed Connectors 1 DB25 female 1 5 screw terminal block Diagnostics Loopbacks provided by a front panel switch Analog loopback on a 4 wire loop and digital loopback on equipment interface EIA 232 Status Indication Two bi color LEDs indicate the status of the transmitter and receiver A green light indicates a low logic level 3 to 25V on the EIA 232 interface a red light indicates a high logic level 43 to 25V Operating Temperature 32 to 112 F 0 to 50 C Humidity 95 maximum noncondensing Enclosure Standalone High impact plastic Rackmount Aluminum alloy Power Power is supplied by a wall mounted power transformer No more than 16 Vrms is present in unit SHM B ASYNC Primary 115 VAC 10 60 Hz 5 watts 12 watts max Primary 230 VAC 10 50 60 Hz Secondary 17 VAC 700 mA Size Standalone 1 4 H x 4 25 W x 4 5 D 3 8x 10 9 x 11 7 cm Rackmount 5 25 H x 17 W 9 D 13 x 43 x 23 cm Weight Standalone 1 3 Ib 0 6 kg including transformer Rackmount 3 7 lb 1 7 kg including transformer SHM B ASYNC 2 Introduction The Short Haul Modem Model B Async SHM B Async is an asynchronous full duplex 4 wire line driver receiver which allows two EIA 2
16. ription of the problem with your installation your DTE equipment make and models your equipment s DTE DCE configuration and flow control type hardware or software your EIA 232 cable pinouts and what if anything you have already done to correct the situation SYMPTOM LEDs do not light when power transformer is plugged into a wall outlet 1 Is the power connection loose Try moving or nudging the wall transformer 2 Are there broken power leads Disconnect the power supply Remove the printed circuit board from the chassis Inspect the three leads from the transformer for continuity 3 The SHM B is defective 4 SHM B Async Card Make certain that the SHM B s SHM B ASYNC printed circuit board is properly inserted and fully seated against the motherboard of the rack SYMPTOM No data transfer in one or both directions to from or to and from the SHM B 1 Monitor the TD LED on the sending end modem while sending data The light should flash red green If not check the DCE DTE switch on that unit Once you get a TD LED flashing on that unit simultaneously the RD LED should flash on the other SHM B unit If not go to step 2 2 Inspect the wiring between the two modems Have the wires been properly installed Transmit TX on one modem must be wired to Receive RX on the other modem also Transmit TX must be wired to Receive RX Refer to Figure 2 during your inspection of the four wire circu
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