Dual Port RS-232/422/485 Serial Interface
Contents
1. BLACK BOK LI MARCH 2000 IC113C IC175C Dual Port RS 232 422 485 Serial Interface ie LT LT CA EES E ECH EE ER BUER CUSTOMER Order toll free in the U S 24 hours 7 A M Monday to midnight Friday 877 877 BBOX 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 AND IC STATEMENTS TRADEMARKS FEDERAL COMMUNICATIONS COMMISSION AND INDUSTRY CANADA RADIO FREGUENCY INTERFERENCE STATEMENTS This eguipment generates uses and can radiate radio freguency 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 user2. s authority to operate 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 n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de la classe A prescrites dans le Reglement sur le brouillage radio lectrique publi par Industrie Canada TRADEMARKS USED IN THIS MANUAL AT and IBM are registered trademarks and XT is a trademark of International Business Machines Corporation Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners DUAL PORT RS 232 lt gt 422 485 SERIAL INTERFACE 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 oo Todas las advertencias en el aparato el ctrico y en sus instrucciones de operacion 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 c
3. zsa ms ya Er ano SSA aan g ar 7 T 84 DER T y TE g E loan 4331 E en er EH et 93 T Ki lt BLACK BOX O Copyright 2000 Black Box Corporation All rights reserved 1000 Park Drive e Lawrence PA 15055 1018 e 724 746 5500 e Fax 724 746 0746
4. signal levels are the standard electrical specification used in RS 449 and EIA 530 This allows interfacing with equipment that meets these specifications CHAPTER 2 Introduction RS 485 RS 485 is backward compatible with RS 422 however it is optimized for multidrop applications The output of the RS 422 485 driver is capable of being active enabled or tri state disabled This capability allows multiple ports to be connected in a multidrop bus and selectively polled Half duplex two wire communications are possible by connecting TX to RX and TX to RX in your cable connector The enable to the driver is connected to the UART Request To Send RTS line for RS 485 communications This allows the RS 485 driver to be tri stated disabled when inactive on a multidrop polled network The software that you are using must know how to enable the driver when it is answering a poll Failure to set this jumper correctly can cause transmitter contention problems preventing operation by any nodes on the network The table below shows the connector pinouts for ports J1 port 1 and J2 port 2 on the Interface while using RS 422 485 Pin Number Signal Name Mode 4 Transmit Data Pos TX Output RS 422 3 Transmit Data Neg TX Output RS 422 6 Req To Send Pos RTS Output RS 422 7 Req To Send Neg RTS Output RS 422 5 Ground GND aa 1 Receive Data Pos RX Input RS 422 2 Receive Data Neg RX Input RS 422 9 Clear To
5. terminating resistors A 100 ohm resistor is across each RS 422 485 input and a 1K ohm pull up pull down combination biases the receiver inputs If more than two RS 485 nodes are configured in a multidrop network only the nodes at each end of the bus should have the 100 ohm resistors installed DUAL PORT RS 232 lt gt 422 485 SERIAL INTERFACE 5 Installation The Dual Port RS 232 422 485 can be installed in any of the PC expansion slots except J8 on the original IBM XT and Portable IMPORTANT You MUST set up the operating system BEFORE you physically install the Card 5 1 Software Installation If you are installing an ISA adapter in DOS OS 2 or QNX please refer to the appropriate directory on one of the Serial Utilities Disks for instructions 5 1 1 Windows 3 1x Please refer to the WINDOWS sub directory on the Serial Utilities Diskette for help files and current information on the installation of the Card in this operating environment 5 1 2 Windows 95 98 USERS For the ISA card run setup on disk two of the Serial Utilities Diskettes before installing the card Make note of the resources that Windows assigns the adapter and set the adapter to match those resources Power down the computer and install the adapter as described in Section 5 2 If you wish to change any resources assigned to the adapter refer to the help file installed in the Black Box folder in the Start Programs menu 5 1 3 Windows NT For t
6. Send Pos CTS Input RS 422 8 Clear To Send Neg CTS Input RS 422 3 Address Selection NOTE Be sure to set the address selections and jumper options before installation Each serial port on the Dual Port RS 232 422 485 Serial Interface occupies 8 consecutive I O locations DIP switch SW1 sets the base address for Port 1 and DIP switch SW2 sets the address for Port 2 Be careful when selecting the base address since some selections conflict with existing PC ports The following table shows several examples that usually do not cause a conflict Address Binary Switch Position Setting Hex A9 AO 1 2 3 4 5 6 7 280 287 1010000XXX OFF ON OFF ON ON ON ON 2A0 2A7 1010100XXX_ OFF ON OFF ON OFF ON ON 2E8 2EF 1011101XXX_ OFF ON OFF OFF OFF ON OFF 2F8 2FF 1011111XXX OFF ON OFF OFF OFF OFF OFF 3E8 3EF 1111101XXX OFF OFF OFF OFF OFF ON OFF 300 307 1100000XXX OFF OFF ON ON ON ON ON 328 32F j1100101XXX_ OFF OFF ON ON OFF ON OFF 3F8 3FF 1111111XXX OFF OFF OFF OFF OFF OFF OFF Typically COM1 3F8h COM2 2F8h COM3 3E8h COM4 2E8h The following illustration shows the correlation between the DIP switch setting and the address bits used to determine the base address In the figure below the address 300 hex through 307 hex is selected 300 hex 11 0000 0XXX in binary representation Note that sett
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8. ck your software configuration instructions to determine the most appropriate IRQ setting DUAL PORT RS 232 lt gt 422 485 SERIAL INTERFACE ee a Ce A 29 3 4 5 7 10 11 12 15 CC 293 4 5 7 10 11 12 15 Figure 4 1 Header El and E2 IRO selection Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting and setting the appropriate selections at E9 and E10 Consult your particular software for IRQ selection If no interrupt is desired remove the jumper NOTE IRQ 2 on AT class machines is not available IRQ 9 is substituted in place of IRQ 2 To select IRQ 9 place jumper in the IRQ 2 position Figure 4 2 shows Headers E9 and El0 N indicates the normal single interrupt per port mode The S indicates the shared interrupt mode which allows more than one port to access a single IRQ The M indicates that the inclusion of a 1K ohm pull down resistor is required on one port when sharing interrupts E10 sets Port 1 and E9 sets Port 2 CHAPTER 4 Option Selection Figure 4 2 Headers E9 and E10 in Normal Mode Set jumpers to N for single interrupt mode This setting is the normal setting for most applications Set jumpers to S for shared interrupt mode for all ports sharing an IRQ except one Set that port block for M This provides the pull down resistor circuit that makes sharing of IRQ s possible If you are us
9. he ISA card run setup on disk two of the Serial Utilities Diskettes before installing the card After installing the software refer to the help file that automatically comes up for installation instructions CHAPTER 5 Installation 5 2 Hardware Installation The ISA Card can be installed in any of the PC expansion slots The Card contains several jumper straps for each port that you must set for proper operation 1 Turn off PC power Disconnect the power cord 2 Remove the PC case cover 3 Locate an available slot and remove the blank metal slot cover 4 Gently insert the Card into the slot Make sure that the Card is seated properly 5 Replace the screw 6 Replace the cover 7 Connect the power cord Installation is complete Self Test To perform a self test on the card connect the transmit and receive data pins together If running 422 485 make sure the plus leads are not connected to the minus leads Execute the SLT program provided on the supplied utility diskette DUAL PORT RS 232 gt 422 485 SERIAL INTERFACE Appendix Circuit Board Design zlLHod If 422 485 PORT 1 RS 232 PORT 1 422 485 PORT 2 RS 232 PORT 2 du Zdu SU Je di o gt en li JU t Board Desi ircui APPENDIX me yezis DEE ZL 3ahS y zia
10. ing more than one Dual Port RS 232 422 485 Serial Interface or a compatible card in a bus you should only have one port set to M Set jumpers to S if you are using more than one Dual Port RS 232 422 485 in a bus or if you wish to completely remove the pull down resistor for hardware compatibility Setting the board in this configuration when it is not accompanied by a pull down resistor will prevent the ports from triggering an interrupt 4 2 RS 232 Interface Options To select the RS 232 mode of operation install DIP shunts in the sockets found at E5 and E8 E5 sets Port 1 and E8 sets Port 2 These DIP shunts are completely independent of each other allowing the user to select a single port RS 232 or a single port RS 422 There are no modem control options for the RS 232 interface all control signals are implemented If your software requires certain handshaking signals to be active then you must connect them either to the device with which you are communicating or you can satisfy the handshake signal requirements by connecting pins 7 to 8 RTS to CTS and pins 4 to 6 to 1 DTR to DSR amp DCD Make these connections on the DB9 connector that connects to each port Refer to Figure 4 3 when making these connections The table on page 4 lists the RS 232 pinout descriptions DUAL PORT RS 232 lt gt 422 485 SERIAL INTERFACE Figure 4 3 DB9 Handshake Loopback connections for RS 232 shown from rear or cable side of co
11. ing the switch ON or closed corresponds to a 0 in the address while leaving it OFF or open corresponds to a 1 4 Option Selection NOTE Be sure to set the address selections and jumper options before installation The board contains several jumper straps for each port which must be set for proper operation 4 1 Port Enable Disable Each port on the Dual Port RS 232 422 485 can be enabled or disabled with switch position 8 on the DIP switch The port is enabled with the switch ON or closed and disabled when OFF or open If any port is disabled be sure to also disable the interrupt request for that port by removing the IRQ jumper see Figure 4 1 INTERFACE SELECTION RS 422 485 To select the RS 422 485 mode of operation install DIP shunts in sockets found at E6 and E7 E6 sets Port 1 and E7 sets Port 2 RS 232 To select the RS 232 mode of operation install DIP shunts in sockets found at E5 and E8 E5 sets Port 1 and E8 sets Port 2 IRQ Selection Headers El and E2 select the interrupt request for each serial port El Port 2 E2 Port 1 If COM1 is selected this jumper must be on the IRQ4 setting If COM2 is selected this jumper must be on IRQ3 NOTE Most communications software applications default COM3 to IRQ4 and COM4 to IRQ3 This requires the sharing of interrupts between COM1 and COM3 and between COM2 and COM4 While this is the default it is not always the best setting Che
12. ion RS 232 or RS 485 422 2 or 4 wire individually selectable on each port Connectors 2 DB9M Communications Chip IC113C 16550 UART IC175C 16950 UART MTBF gt 150 000 hours MTTR lt 0 25 hours Materials Boards are solder mask over bare copper or tin nickel Operating Temperature 32 to 122 F 0 to 50 C Storage Temperature 4 to 158 F 20 to 70 C Humidity 0 to 90 relative humidity noncondensing Power 5 VDC 195 mA 12 V 25 mA derived from PC bus Size 5 W x 7 5 D 12 7 x 19 cm Weight 0 2 Ib 0 1 kg DUAL PORT RS 232 lt gt 422 485 SERIAL INTERFACE 2 Introduction 2 1 Overview If you need to operate RS 232 RS 422 or RS 485 devices from your PC use the Dual Port RS 232 422 485 Serial Interface Connect to any device that uses the RS 232 interface such as modems data entry terminals and plotters This card allows you to configure two RS 232 ports two RS 422 485 ports or one of each The Dual Port RS 232 422 485 also features greater maximum distance and allows multi drop communications The card also includes a serial utility disk with Seacom a DOS interrupt and driver package Seacom allows data to be buffered eliminating data loss in high speed data transfers It also allows more than 4 ports 256 max to be configured and utilized under DOS The README file on the serial utility disk contains information about the latest changes and revis
13. ions To view this file insert the diskette into drive A or Band type A TYPE READ ME MORE ENTER or B TYPE READ ME MORE ENTER 2 2 What s Included Your Serial Interface should come with the following items If any of these items are missing or damaged contact Black Box at 724 746 5500 1 Dual Port RS 232 422 485 Serial Interface card 2 serial utility software diskettes 1 for 32 bit Windows 1 for DOS and Windows9 3 1x This manual CHAPTER 2 Introduction 2 3 Features Listed below are the special features your Serial Interface offers e Each port is independently addressable e Eleven interrupt options including AT interrupts for simple integration into existing systems e IRQs 2 9 3 4 5 6 7 10 11 12 and 15 supported e IRQs can be shared or individually set for each port e Supports Interrupt Sharing only one interrupt line required for multiple ports e Supports any character set defined by binary notation e 16550 UARTs on the IC113C help ensure against data loss This chip features programmable baud rate data format interrupt control and a 16 byte FIFO The IC175C uses 16950 UARTs which feature a 128 byte buffer for even better performance e Faster baud rates up to 115 2 Kbps IC113C or 460 8 kbps and above IC175C e Addressable as COM through COM4 or any other address up to 3FF Hex e Support for non standard ba
14. 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 largo 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 Q 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 DUAL PORT RS 232 lt gt 422 485 SERIAL INTERFACE Contents Chapter Page lo SPE CHICA EE 1 2 A eege 2 bh a TEE 2 222 Whats Incidencia innato e 2 e A IA AWA 3 2 4 Technical Description Sue geseid ku 4 32 Lola a e REECH 6 4 Option TEEN 7 4 1 Port Enable Disable nn a a e a ae aa E 7 4 2 RS 232 Interface Options ocooccccccoccnnnooncnnnonnnononnnonnnononnn cono rn E iieii 9 4 3 RS 422 485 Interface Options pe 10 4 4 Line Termination Nasha 11 e E Kee EE eet 12 Appendix Circuit Board Desom arceiraora i i 14 1 Specifications Protocol Asynchronous Speed IC113C Up to 115 2 Kbps IC175C 460 8 kbps and higher Operat
15. nnector 4 3 RS 422 485 Interface Options To select the RS 422 485 mode of operation install DIP shunts in the sockets found at E6 and E7 E6 sets Port 1 and E7 sets Port 2 Figure 4 4 shows Headers E3 and E4 Position A determines whether the RS 485 driver is enabled by the UART signal Request To Send RTS or always enabled With the jumper installed in position A RTS enables the driver Removing the jumper enables the driver regardless of RTS E4 sets Port 1 and E3 sets Port 2 This jumper should be set to A only if you are running the board in a multidrop polled environment such as RS 485 and you have software that knows how to talk on the RS 485 bus For normal point to point RS 422 such as terminal emulation make sure that a jumper at position A is not in place Positions B and C determine whether the board provides a direct ground connection as in RS 232 and most RS 422 or a 100 ohm high impedance ground The high impedance ground is normally used by RS 485 and some RS 422 to avoid ground loop currents with long cables Position B selects the direct ground and position C selects the 100 ohm high impedance ground C should be selected when RS 422 485 operation is selected CHAPTER 4 Option Selection st MO Figure 4 4 Headers E3 and E4 RS 485 Enable Ground Selection 4 4 Line Termination Typically each end of the RS 422 485 bus must have line
16. on carritos o pedestales que sean recomendados por el fabricante 7 El parato 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 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 NOM STATEMENT 11 El aparato electrico debera ser connectado a una fuente de poder solo del tipo descrito en el instructivo de operacion 0 como se indigue en el aparato 12 Precaucion debe ser tomada de tal manera gue la tierra fisica y la polarizacion del eguipo no sea eliminada 13 Los cables de la fuente de poder deben ser guiados de tal manera gue 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 equio el ctrico debe ser
17. ud rates available These baud rates such as 31 25K or 76 8K baud are supported by installing a different oscillator at location Y1 Call Technical Support for more information DUAL PORT RS 232 gt 422 485 SERIAL INTERFACE 2 4 Technical Description The Dual Port RS 232 422 485 Serial Interface utilizes the same 16550 UART chip found in the IBM asynchronous adapter This chip features programmable baud rate data format and interrupt control Refer to the IBM Technical Reference for details on programming the chip RS 232 The Dual Port RS 232 422 485 Serial Interface meets the RS 232C specifications and provides an asynchronous serial I O port This is the standard port configuration found in the IBM AT computer including the DB9 style connector The table below shows the connector pinouts for ports J1 port 1 and J2 port 2 on the Interface while using RS 232 Pin Number Signal Name Mode 3 Transmit Data TD Output RS 232 7 Request To Send RTS Output RS 232 4 Data Term Ready DTR Output RS 232 5 Ground GND 2 Receive Data RD Input RS 232 1 Data Carrier Detect DCD Input RS 232 6 Data Set Ready DSR Input RS 232 8 Clear To Send CTS Input RS 232 9 Ring Indicator RI Input RS 232 RS 422 RS 422 allows very long distance communications 4000 feet about 1219 meters at 9600 baud based on use of Category 3 UTP or better with virtually error free differential drive characteristics RS 422
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