Black Box MD3317 Modem User Manual
Contents
1. i O 0 00 0 00 AUGUST 1997 ME840A M ME840A S MD3317 MD3318 lt BLACK BOX Short Haul Modem FSK RS 485 Modules Order toll free in the U S 24 hours 7 A M Monday to midnight Friday 877 877 BBOX CUSTOMER SUPPORT FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 INFORMATION Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com FCC STATEMENT 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 op2. 19 O 5 12 Merce 2 2 bi 5 20 SHORT HAUL MODEM SHM FSK 1 Specifications Data Format RS 232C RS 422 485 optional Operation Full duplex or half duplex controlled carrier serial asynchronous data Mode Point to point or multipoint Data Transmission Speed Up to 9600 baud Modulation Frequency shift key carrier signal inductively and capacitively isolated Distance Up to 48 000 feet 9 1 miles or 14 6 km on single twisted pair Operating Temperature 32 to 140 F 0 to 60 C Enclosure All metal enclosure 16 gauge steel polyurethane paint Interface DTE DCE jumper selectable Female DB25 connector for RS 232C green two position pluggable terminal block for carrier black two position pluggable terminal block for power LED Indicators Carrier Detect Receive Data Transmit Data Power Power Requirements 120 VAC 50 60 Hz at 9 6 watts or 24 VDC at 10 watts Size 1 75 H 7 5 Wx 10 5 D 4 45 x 19 1 x 26 7 cm Weight 4 5 2 kg SHORT HAUL MODEM SHM FSK 2 Introduction The Short Haul Modem SHM FSK is a private line modem that allows half and full duplex RS 232 data communications at 9600 bps over a single dedicated wire pair and across sliding contacts The SHM FSK operates using pure Frequency Shift Key FSK at high carrier frequencies 100KHz 106 5KHz to 150KHz 156 5KHz These high frequencies make the SHM FSK particularly immu
3. 5 CLEAR TO SEND 6 DATASET READY 7 SIGNAL GROUND COMMON RETURN 8 RECEIVED LINE SIGNAL DETECTOR 9 VOLTAGE 10 VOLTAGE 11 12 SECONDARY RECEIVED LINE SIGNAL INDICATOR 13 SECONDARY CLEAR TO SEND SECONDARY TRANSMITTED DATA 14 DCE TRANSMITTER SIGNAL ELEMENT TIMING 15 SECONDARY RECEIVED DATA 16 RECEIVER SIGNAL ELEMENT TIMING 17 LOCAL LOOPBACK 18 SECONDARY REQUEST TO SEND 19 DATA TERMINAL READY 20 SIGNAL QUALITY DETECTOR 21 RING INDICATOR 22 DATA SIGNAL RATE SELECTOR 23 TRANSMITTER SIGNAL ELEMENT TIMING 24 TEST MODE 25 Figure 2 2 Pinout of the RS 232 Port SHORT HAUL MODEM SHM FSK Figure 2 3 is an illustration of a typical full duplex or half duplex point to point application Copper Pairs up to 48 000 feet RS 232 9 1 miles or 14 6 km SHM FSK SHM FSK Remote Telemetry Unit Programmable Logic Controller PLC Figure 2 3 Typical Application Connections SHORT HAUL MODEM SHM FSK 3 Installation The SHM FSK units are shipped ready for either full duplex or half duplex multi drop operation The jumpers have been factory set in fullduplex mode The Master and Remote units are both factory configured as DCEs Data Communications Equipment with the jumpers on headers P1 and P2 in the B C position Data into the DB25 is on pin 2 and data out 18 on pin 3 Also see Chapter 5 Jumper Settings Before inst
4. inductors capacitors or excessive resistance from bad connections for example or shorts between the wires can seriously degrade performance or completely block data transmission 7 3 Loopback Test A loopback test is suggested to confirm the proper operation of SHM FSKs in point to point operation as follows A PC running a communication program in full duplex can be connected to one of the SHM FSKs in a point to point configuration A jumper wire a bent paper clip works very well is placed between pin sockets 2 and 3 of the DB25 on the other SHM FSK Data sent to the first SHM FSK will be looped back from the second and appear on the PC screen If the characters are correct the SHM FSKs are functioning 8 RS 485 Interface Optional RS 485 modules are available for connection to multiple remote devices The following modules are available e RS 485 Module 2 Wire part number MD3317 e 435 485 Module 4 Wire part number MD3318 All operating functions and instructions are the same as for the RS 232 full duplex version except that the digital interface through the DB25 connector uses pin 12 as the DO RI connection and pin 13 as the DO RI connection The RS 232 connections pins 2 3 and 7 are not functional CAUTION Do not connect anything except an RS 485 signal to positions 12 and 13 on the DB25 or damage to the circuit could occur The AE 485 Auto Enable circuit contains a special feature that eliminates the need
5. de operaci n Todo otro servicio deber ser referido a personal de servicio calificado 9 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 10 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 go INSTRUCCIONES DE SEGURIDAD 11 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 12 Precauci n debe ser tomada de tal manera que la tierra fisica y la polarizaci n del equipo no sea eliminada 13 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 14 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deber ser localizada lejos de las lineas de energia 16 El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un larg
6. for a separate enable signal or line to command the 485 transmit and receive functions Data will pass through the SHM FSK s RS 485 port transparently in either direction The SHM FSKs are operated in full duplex point to point mode no carrier control when using the 5 interface Up to 32 remote RS 485 devices can be multi dropped off the SHM FSK AE 485 port at distances of up to 4000 feet and at data rates of 9600 baud A 100 ohm termination resistor should be connected at the ends of the 485 line lt BLACK BOX O Copyright 1997 Black Box Corporation All rights reserved 1000 Park Drive e Lawrence PA 15055 1018 e 724 746 5500 e Fax 724 746 0746
7. K unit with an appropriate cable 6 Connect the transmission line to the unit at the green pluggable terminal block There is no polarity requirement 7 Connect the unit s power cord at the black two position pluggable terminal block marked PWR facing receptacle is on the left and the right and plug the modular transformer into a convenient 120 VAC outlet Plugging the power in will power up the units there is no On Off switch 4 Operation Point to point full or half duplex operation is usually conducted with the both the Master and Remote SHM FSK carriers on all the time This is achieved by placing the P4 jumper in the B C position and either not connecting the RTS line DB25 pin 4 to the SHM FSKs or making sure that the RTS line supplied by the devices connected to the SHM FSK is either floating or logic high In half duplex multi drop operating mode with the P4 jumper in the A B position the RTS line of the intelligent device that a Remote SHM FSK is connected to PC PLC or RTU is used to control the the SHM FSK s transmitted carrier When logic is low the carrier is turned off when logic is high the carrier is turned on If the RS 232 cable is disconnected the RTS connection on the SHM FSK is biased low and the carrier remains off If the P4 jumper is in the B C position the RTS connection is biased high and the carrier will stay on When properly configured the SHM FSK is capable of h
8. alf or full duplex data transmission at rates up to 9600 baud The SHM FSKs require no settings for data rate and will operate transparently as data is fed to them They will begin communicating data as soon as connections are made and they are powered up 5 Jumper Settings There are several configuration options that can be selected by jumpers as described below The jumper pins are internal and are identified by lettering on the circuit board They are accessed by removing the four retaining screws on the top cover of the enclosure and removing the cover Be sure that the unit is disconnected from power before removing the cover 5 1 DCE and DTE Settings Both the SHM FSK Master and Remote units are configured at the factory as DCE Data Communication Equipment for connection to DTE Data Terminal Equipment A PC PLC or multiplexor is usually configured as DTE If either the Master or Remote must be changed from DCE to DTE move the jumpers on blocks P1 and P2 which are located directly behind the DB25 RS 232 connector on the rear panel 5 2 Transmitter Output Level The SHM FSK allows the selection of either normal or high power HP transmitter output The high power output has six times greater peak to peak transmitted signal and provides correspondingly greater signal to noise ratio High power transmitter operation is generally best in applications involving sliding contacts or in very noisy EMI environments Howe
9. alling the SHM FSK units make sure that the digital devices to be connected to the SHM FSK units are capable of communicating with each other if connected with a conventional three wire RS 232 data cable Once this has been established the devices can be connected to the SHM FSK units and RS 232 data communications will take place transparently NOTE Make sure that the wire pair to be used for data communications between SHM FSK units is connected only to those units has no branches has no attached inductance capacitance or resistance and has no loading coils filters or any other load and that all connections are clean and solid Since the data line is transformer isolated from the rest of the circuit neither leg of the data carrying twisted pair should be grounded The installation procedure is as follows 1 Remove the unit s cover by taking out the four screws on top of the modem 2 Set the Remote units for either full or half duplex operation by positioning the jumper on header P4 located behind the DB25 connector For full duplex operation the jumper should be in the B C position for half duplex multi drop operation using RTS line carrier control the jumper should be in the A B position SHORT HAUL MODEM SHM FSK 3 Confirm that the jumpers on positions 21 and P2 are in the B C position 4 Replace the cover 5 Connect the RS 232 communications port of the digital data device PC etc to the SHM FS
10. are powered by nominal 24 volts DG which 18 supplied to a black two position plugabble terminal block on the left if you re facing the pins on the rear panel The units are delivered from the factory with 120VAC to 24DC wall transformers which have a black plug attached An external 24VDC supply can also be used to power up the MDLs The current draw is 250mA SHORT HAUL MODEM SHM FSK 2 3 Operating Mode The SHM FSKs can be operated in either point to point or multipoint polling mode For multi drop data communications the SHM FSK can be operated with one Master and typically up to eight Remote units The transmitter in each Remote unit is controlled by the intelligent device it is connected to The Master unit s transmitter remains on all the time The green two position pluggable terminal block at the receptacle marked LINE on the back of the SHM FSK unit is used with any two wire cable does not need to be twisted Since the FSK signal is AC there is no polarity required on any of the data line connections 2 4 Diagrams Figure 2 1 shows the location of the LEDs on the front of the SHM FSK O O RxD TxD LPBK PWR lt gt Figure 2 1 Location of LEDs on the SHM FSK SHORT HAUL MODEM SHM FSK Figure 2 2 is a pinout of the RS 232 port SIGNAL PIN PIN SIGNAL DESTINATION NUMBER NUMBER DESTINATION 1 PROTECTIVE GROUND 2 TRANSMITTED DATA 3 RECEIVED DATA 4 REQUEST TO SEND
11. erate the equipment This digital apparatus 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 met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de classe A prescrites dans le Reglement sur le broutllage radio lectrique publi par Industrie Canada INSTRUCCIONES DE SEGURIDAD NORMAS OFICIALES MEXICANAS NOM ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1 Todas las instrucciones de seguridad y operaci n deber n ser le das antes de que el aparato el ctrico sea operado 2 Las instrucciones de seguridad y operaci n deber n ser guardadas para referencia futura 3 Todas las advertencias en el aparato el ctrico y en sus instrucciones de operaci n deben ser respetadas 4 Todas las instrucciones de operaci n y uso deben ser seguidas 5 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 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en las instrucciones
12. ications There are four LEDs on the front panel of the SHM FSK From left to right they are Marking Function CD Carrier Detect RX Data flowing out of the SHM s RS 232 port TX Data flowing into the SHM s RS 232 port PWR Power connected The first diagnostic LED is Carrier Detect In full duplex mode the CD LED must be ON on both units in half duplex carrier control mode with RS 232 cables connected the CD LED will be ON on all Remote SHMs and OFF on the Master SHM The Master CD LED will blink during operation as each Remote SHM turns on its carrier to answer back to the Master If the correct CD LEDs are not ON there is likely a carrier cable problem Assuming that the CD indication is correct a loopback test is recommended as described in Section 7 3 7 General Operating Notes 7 1 Tuned Circuits The SHM FSK uses tuned circuits to achieve its high performance These circuits have been carefully adjusted at the factory to operate over several miles of transmission line In order not to degrade performance it is important not to disturb these adjustments In particular coils 2 T4 and T5 and potentiometers R18 R20 R31 and R57 should not be adjusted If these adjustments have been inadvertently changed call for technical support 7 2 Proper Operation Proper operation of SHM FSK requires that the transmission line be non loaded free from inductors and capacitors on the line The presence of
13. nd via Jumper 5 This is generally not recommended A separate chassis ground wire may be connected to the SHM FSK s metal enclosure by means of any of the cover mounting screws as desired to avoid a possible shock hazard 5 6 Half Duplex Operation Carrier Control The SHM FSK can be operated in multi drop halfduplex mode by controlling the transmitter s carrier on off using external signals The most common external carrier control signal is through the RS 232 port RTS line pin 4 This line are selected by Jumper P4 A B When an external RTS logic high is asserted the SHM FSK carrier is turned on logic low or ground turns the carrier off The SHM FSK RTS line is biased low so that if the RS 232 cable is disconnected or the external controlling device is turned off the carrier will go off A B selects RTS and B C selects DSR Usually only the Remote units have their carriers controlled by the devices they are connected to The Master unit s carrier is left on all the time There is no interference since the Master and Remote carrier frequencies are different The factory setting for both SHM FSK Masters and Remotes is P4 A B for full or half duplex point to point operation An alternative carrier control method is to connect a cable to the SW1 header which allows external contact closure or solid state switch control of the transmitter Please call technical support for special instructions __ 6 LED Ind
14. ne to crosstalk and outside noise interference providing highly reliable continuous data transmission over distances of several miles in harsh industrial environments The SHM FSK converts digital signals to modulated high frequency sine wave carrier signals that can be transmitted much longer distances with greater noise immunity than square wave digital signals The digital Space and Mark or 0 and 1 are converted in the transmitter to carrier signals having two slightly different frequencies that are identified by the receiver and reconverted to the digital signals The SHM FSKs are configured as either Master or Remote units and can be used for either point to point or multi drop data communications The SHM FSKs send data asynchronously They are transparent to protocol and to data rate from DC to 9600 baud The SHM FSK can be configured as a master unit or as a slave unit See page 13 for more information 2 1 SHM FSK Master Units part number ME840A M The SHM FSK Master unit transmits at 106 5 100 KHz Space Mark and receives at 156 5 150 KHz A green pluggable two position terminal block at the back of the unit is used for connection to the data line There is no polarity to the data line connection 2 2 SHM FSK Remote Units part number ME840A S The SHM FSK Remote unit transmits at 156 5 150 KHz and receives at 106 5 100 KHz It has the same data line connector as the Master unit Both the Master and Remote SHM FSKs
15. o periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta 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 SHORT HAUL MODEM SHM FSK TRADEMARKS All applied for and registered trademarks are the property of their respective owners CONTENTS Maicao A 2024200007 000 8 paa Se 9 2E 0 REMOTE de 9 10 I OS es 10 diras a ea ras peca doses 13 k Operio 15 Oe ns 20 E em eee aw Soe 16 CE And DIE 3 05 0 Rods ye otha e ea 16 du Iransmitter Output Level 16 Da Receiver E A 17 dl Calder Detects 000 0202 502928020 0005008 0970095 17 Chassis Ground AA 17 5 6 Half Duplex Operation Carrier Control 17 6 LED dy ee o da es 18 7s General Operating Notes esse riera 19 A CCU AAA een E phala 19 Lo Prop T 19 o LOOpuack Lesto esopia cavas
16. ver caution is advised in some cases since high power carrier signals will result in more crosstalk to adjacent conductors The jumper to select normal or high power is located at position TP2 High power is selected when the jumper is positioned center to left marked H normal output is selected with center to right marked N When using the HP setting the receiver gain should be set to low for data line lengths under 5000 feet see Section 5 3 The factory setting is normal center to right SHORT HAUL MODEM SHM FSK 5 3 Receiver Gain The SHM FSK incorporates a receiver amplifier on the circuit board This amplifier has low normal and high gain settings configured by a T shaped pin block near the center of the circuit board with pins marked G1 H G2 G3 L and N the leg of the G1 H G2 is the high gain setting G2 N the normal medium gain and G3 L G2 the low gain The units are delivered from the factory set at normal gain because the transmitter has been factory set at normal output If the data line is under 5000 feet long the low gain setting should be used whenever the high power transmitter option is selected 5 4 Carrier Detect Carrier Detect to the RS 232 connector is enabled or disabled by Jumper Matrix P3 The SHM FSK units are shipped with the Carrier Detect enabled jumper on 5 5 Chassis Ground Chassis ground can be connected to signal grou
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