MARCH 2000 IC113C IC175C Dual Port RS-232/422/485 Serial Interface CUSTOMER SUPPORT INFORMATION Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 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 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 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 présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié 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↔422/485 SERIAL INTERFACE NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura. 3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas. 4. Todas las instrucciones de operación y uso deben ser seguidas. 5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc.. 6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante. 7. El parato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante. 8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación. Todo otro servicio deberá ser referido a personal de servicio calificado. 9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá, alfombra o superficie similar puede bloquea la ventilación, no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilación. 10. El equipo eléctrico 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 eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación, o como se indique en el aparato. 12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización 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 atención a los contactos y receptáculos donde salen del aparato. 14. El equio eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante. 15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas de energia. 16. El cable de corriente deberá 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 ventilación. 18. Servicio por personal calificado deberá ser provisto cuando: A: El cable de poder o el contacto ha sido dañado; u B: Objectos han caído o líquido 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 desempeño; o E: El aparato ha sido tirado o su cubierta ha sido dañada. DUAL PORT RS-232↔422/485 SERIAL INTERFACE Contents Chapter Page 1. Specifications...................................................................................................1 2. Introduction ....................................................................................................2 2.1 Overview ..................................................................................................2 2.2 What’s Included......................................................................................2 2.3 Features ...................................................................................................3 2.4 Technical Description ............................................................................4 3. Address Selection ............................................................................................6 4. Option Selection .............................................................................................7 4.1 Port Enable/Disable ...............................................................................7 4.2 RS-232 Interface Options .......................................................................9 4.3 RS-422/485 Interface Options .............................................................10 4.4 Line Termination .................................................................................11 5. Installation.....................................................................................................12 Appendix: Circuit-Board Design.......................................................................14 CHAPTER 1: Specifications 1. Specifications Protocol — Asynchronous Speed — IC113C: Up to 115.2 Kbps; IC175C: 460.8 kbps and higher Operation — 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 — >150,000 hours MTTR — <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 lb. (0.1 kg) 1 DUAL PORT RS-232↔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 revisions. To view this file, insert the diskette into drive A or B and 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 Windows®3.1x, This manual 2 CHAPTER 2: Introduction 2.3 Features Listed below are the special features your Serial Interface offers. • Each port is independently addressable. • Eleven interrupt options, including AT interrupts, for simple integration into existing systems. • IRQs (2 [9], 3, 4, 5, 6, 7, 10, 11, 12, and 15) supported. • IRQs can be shared or individually set for each port. • Supports Interrupt Sharing—only one interrupt line required for multiple ports. • Supports any character set defined by binary notation. • 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. • Faster baud rates—up to 115.2 Kbps (IC113C) or 460.8 kbps and above (IC175C). • Addressable as COM1: through COM4: or any other address up to 3FF Hex. • Support for non-standard baud 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. 3 DUAL PORT RS-232↔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 7 4 5 2 1 6 8 9 Transmit Data (TD) Request To Send (RTS) Data Term Ready (DTR) Ground (GND) Receive Data (RD) Data Carrier Detect (DCD) Data Set Ready (DSR) Clear To Send (CTS) Ring Indicator (RI) Output RS-232 Output RS-232 Output RS-232 –––––––––––– Input RS-232 Input RS-232 Input RS-232 Input RS-232 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 signal levels are the standard electrical specification used in RS-449 and EIA-530. This allows interfacing with equipment that meets these specifications. 4 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 3 6 7 5 1 2 9 8 Transmit Data Pos. (TX+) Transmit Data Neg. (TX-) Req. To Send Pos. (RTS+) Req. To Send Neg. (RTS-) Ground (GND) Receive Data Pos. (RX+) Receive Data Neg. (RX-) Clear To Send Pos. (CTS+) Clear To Send Neg. (CTS-) Output RS-422 Output RS-422 Output RS-422 Output RS-422 -------------------Input RS-422 Input RS-422 Input RS-422 Input RS-422 5 DUAL PORT RS-232↔422/485 SERIAL INTERFACE 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 Hex 280-287 2A0-2A7 2E8-2EF 2F8-2FF 3E8-3EF 300-307 328-32F 3F8-3FF A9 A0 1010000XXX 1010100XXX 1011101XXX 1011111XXX 1111101XXX 1100000XXX 1100101XXX 1111111XXX Switch Position Setting 1 OFF OFF OFF OFF OFF OFF OFF OFF 2 ON ON ON ON OFF OFF OFF OFF 3 OFF OFF OFF OFF OFF ON ON OFF 4 ON ON OFF OFF OFF ON ON OFF 5 ON OFF OFF OFF OFF ON OFF OFF 6 ON ON ON OFF ON ON ON OFF 7 ON ON OFF OFF OFF ON 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 setting the switch ON (or closed) corresponds to a “0” in the address, while leaving it OFF (or open) corresponds to a “1.” A9 A3 EN 0 ON 1 OFF 1 6 2 3 4 5 6 7 8 CHAPTER 4: Option Selection 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 E1 and E2 select the interrupt request for each serial port (E1–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. Check your software configuration instructions to determine the most appropriate IRQ setting. 7 DUAL PORT RS-232↔422/485 SERIAL INTERFACE E1 2/9 3 4 5 7 10 11 12 15 2/9 3 4 5 7 10 11 12 15 E2 Figure 4-1. Header E1 and E2 (IRQ 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 E10. “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. 8 M S N 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 using 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 singleport 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 & 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.) 9 DUAL PORT RS-232↔422/485 SERIAL INTERFACE 5 4 9 3 8 2 7 1 6 Figure 4-3. DB9 Handshake Loopback connections for RS-232 (shown from rear or cable side of connector). 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-topoint 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. 10 A B C CHAPTER 4: Option Selection 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-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. 11 DUAL PORT RS-232↔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 the 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. 12 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. 13 14 C1 C1 SW1 V1 C5 U4 U5 PORT1 R1 U1 PORT1 C3 SW2 PORT2 C2 U2 PORT2 R2 P6 P2 PORT2 PORT1 E1 E2 U3 PORT2 PORT1 E9 E10 2 2 R4 R5 3 3 D1 R3 D2 4 4 5 5 6 6 10 10 11 11 12 12 15 15 C7 C8 C6 E3 PORT2 R7 A B C RP1 U6 U7 RP4 RP2 RP3 U11 A B R6 C E4 PORT1 U18 U8 U9 R9 R8 P1 P3 C9 E8 E7 U12 E6 E5 U13 RS-232 PORT 2 422/485 PORT 2 RS-232 PORT 1 422/485 PORT 1 C10 J1 PORT 2 1 6 J1 PORT 1 5 9 1 6 5 9 Appendix: Circuit-Board Design DUAL PORT RS-232↔422/485 SERIAL INTERFACE A4 A3 A2 P1 P1 P1 D6 A5 P1 P2 A6 P1 P2 A7 P1 D4 A8 P1 B21 A9 P1 P1 B14 P1 D5 B13 P1 P2 A29 P1 D3 A30 P1 P2 A31 P1 B23 B2 P1 P1 A28 P1 B4 A27 P1 B24 A26 P1 B25 A25 P1 P1 A24 P1 P1 A23 P1 P1 A22 P1 IRQ15 IRQ11 IRQ7 IRQ12 IRQ10 IRQ5 IRQ4 IRQ3 D7 D6 2 4 6 8 10 12 14 16 18 2 4 6 8 10 12 14 16 18 1 3 5 7 9 11 13 15 17 19 1 E2 1 3 5 7 9 11 13 15 17 GND GND 3 4 5 6 7 8 9 D5 E1 GND BRD 11 13 15 17 19 2 4 6 8 1 3 5 7 9 12 14 16 18 2 SHEET 1 2 1 SW1 16 R5 3 SW1 14 1 5 SW1 12 GND D4 +5V 7 SW1 10 6 4 2 D3 D2 D1 D0 RD/ WR/ A2 A1 A0 RESET IRQ2 GND SW1 SW1 SW1 13 11 15 A4 A3 A5 A6 A7 A8 VSS P>Q P=Q VDO U1 U6 B1 2 2 R4 R3 B2 A2 B3 A3 B4 A4 B5 A5 B6 A6 B7 A7 B8 A8 74LS245 A1 VSS VDO U12 HC244 Y1 Y2 Y3 Y4 VDO/VSS U3 HC244 5 4 20 10 1 19 20 1 1 17 16 15 14 13 12 11 18 10 20 9 7 5 3 10 Y1 18 16 Y2 14 Y3 12 Y4 VDO/VSS G DIR A1 A2 A3 A4 G A1 A2 A3 A4 G U3 74LS125A 6 74LS682 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 P0 P1 P2 P3 P4 P5 P6 P7 9 GND +5V GND 1 BD1 BD2 BD3 BD4 BD5 BD6 BD7 1 8 R1 D2 D1 SW1 BD0 BWR/ BRD/ BRESET BA0 BA1 BA2 +5V GND GND +5V 1 2 2 2 GND 7 5 3 1 SW2 SW2 SW2 SW2 10 12 14 16 U6 74LS125A 8 U6 74LS125A 11 2 6 9 10 12 4 1 1 GND GND 1 13 +5V 74LS125A 2 1 6 SW2 11 U6 4 SW2 13 3 2 SW2 15 A8 A6 A4 AEN A3 A5 A7 A9 3 5 7 9 12 14 16 18 2 4 6 8 11 13 15 17 VSS P>Q P=Q VDO U2 10 1 +5V GND 19 20 SHEET 2 SHEET 2 BD0 BD1 BD2 BD3 BD4 BD5 BD6 BD7 SHEET 2 TD1 DTR1 RTS1 GND +5V GND TD2 7 1 1 2 3 4 5 6 7 8 33 32 34 31 24 23 15 30 11 SW2 8 NC 8250A 8 8250A XTAL1 VSS XTAL2 MR D0 CS0 D1 CS1 D2 CS2 D3 DISTR D4 DISTR D5 DOSTR D6 DOSTR D7 ADS DTR RCLK RTS SIN OUT1 CTS OUT2 DSR CSOUT DCD DDIS RI BAUDOUT A0 INTRPT A1 SOUT A2 VDO U4 TXCO OUT VDO Y1 14 XTAL1 XTAL2 MR D0 CS0 D1 CS1 D2 CS2 D3 DISTR D4 DISTR D5 DOSTR D6 DOSTR D7 ADS DTR RCLK RTS SIN OUT1 CTS OUT2 DSR CSOUT DCD DDIS RI BAUDOUT A0 INTRPT A1 SOUT A2 U5 VSS VDO 9 VSS 20 40 1 2 3 4 5 6 7 8 33 32 34 31 24 23 15 30 11 20 40 GND +5V DTR2 SHEET 2 RTS2 BD0 BD1 BD2 BD3 BD4 BD5 BD6 BD7 74LS682 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 P0 P1 P2 P3 P4 P5 P6 P7 R2 16 17 35 12 13 14 22 21 19 18 25 9 10 36 37 38 39 28 27 26 +5V 16 17 35 12 13 14 22 21 19 18 25 9 10 36 37 38 39 28 27 26 +5V 1 GND 2 +5V RP1 2 4 6 8 11 13 15 17 RP1 A9 A8 A6 A4 AEN A3 A5 A7 A9 RP1 AEN 4 3 2 1 4 3 2 1 A11 E9 E10 P1 BRESET BA0 BA1 BA2 BWR/ BRD/ +5V BRESET BA0 BA1 BA2 GND BWR/ BRD/ +5V RD1 CTS1 DSR1 DCD1 RI1 RD2 CTS2 DSR2 DCD2 RI2 SHEET 2 SHEET 2 P1 P1 P1 B7 B31 B1 B29 B3 P1 P1 B9 P1 -12V GND GND C10 +5V +5V +12V 2 1 C8 2 3 1 C9 -12V 2 3 1 +12V 2 3 1 2 3 1 C7 C1 C4 C6 GND 2 3 1 +5V 2 3 1 2 3 1 C5 2 3 1 C2 GND 2 3 C3 +5V 1 APPENDIX: Circuit-Board Design 15 9 7 8 1 3 4 J1 J1 J1 J1 J1 J1 6 9 7 J2 J2 J2 8 1 3 4 J2 J2 J2 J2 SHEET 1 2 J2 SHEET 1 6 J1 DTR2/ TD2/ DCD2/ CTS2/ RD2 CTS2 DSR2 DCD2 RTS2/ RI2/ DSR2/ RD2/ DTR1/ RD1 CTS1 DSR1 DCD1 TD1/ DCD1/ CTS1/ RTS1/ RI1/ DSR1/ 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 RS-232 E8 RS-422 E7 RS-422 E6 24 23 22 21 20 19 18 17 16 15 14 13 24 23 22 21 20 19 18 17 16 15 14 13 24 23 22 21 20 19 18 17 16 15 14 13 U11-15 U11-13 U11-11 U10-3 GND U9-11 U9-13 GND U9-5 U9-3 U8-15 U8-13 U8-11 U10-11 SHEET 2 SHEET 2 SHEET 2 SHEET 2 R8 R9 2 1 -12V 7 4 2 VSS 4A 3A 2A 1A 75174 11 8 6 3 11 10 9 6 7 8 MC145406 12 5 13 14 4 15 16 2 VEE- VSS 8 15 9 7 1 3 VEE+ VDO U11 RP2 RP2 RP2 RP2 +5V 9 10 11 12 13 14 15 16 VDO 16 U13 1Y 1Z 2Y 2Z 3Y 3Z 4Y 4Z EN1 EN2 1 +12V OUTD OUTC OUTB OUTA MC1489 V+ ENA INA ENB INB ENC INC END IND GND U10 MC145406 VEE- VSS 1 5 U8 VEE+ VDO 1 2 3 6 5 10 11 14 13 4 12 14 2 1 5 4 9 10 12 13 7 8 7 6 5 4 3 2 1 1 GND +5V -12V +12V RP4 1 RP4 -12V RP4 24 23 22 21 20 19 18 17 16 15 14 13 GND +5V U11-11 U11-13 DTR2 U11-15 75173 1A 16 1B VDO 2A 3 2B 1Y 5 3A 2Y 3B 3Y 11 13 4A 4Y 4B 8 EN VSS EN U9 GND SHEET 2 SHEET 2 SHEET 1 SHEET 2 SHEET 1 SHEET 2 SHEET 1 SHEET 2 SHEET 2 SHEET 2 SHEET 1 SHEET 2 2 1 6 7 10 9 14 15 4 12 8 4 7 3 1 1 1 U10-11 U10-3 DTR1 U8-11 RTS1 U8-13 TD1 U8-15 1 GND +5V GND +5V RP3 E5 RP3 RS-232 RP3 1 2 3 4 5 6 7 8 9 10 11 12 RP4 8 6 4 1 7 5 3 2 RP3 RD1/ GND +5V J2 5 J1 9 RP1 SHEET 2 SHEET 1 SHEET 1 SHEET 1 RP1 U9-3 U9-5 U9-11 U9-13 TD2 RTS2 RI1 RI2 5 3 U7 8 6 GND2/ +5V 5 74LS04 U7 5 GND1/ 74LS04 A B C A B C 1 3 5 1 3 5 E3 E4 2 4 6 2 4 6 GND GND 2 2 R6 RP4 R7 RP4 1 1 6 8 2 1 1 1 1 16 J1 GND +5V GND +5V GND 13 11 3 1 U7 U7 U7 U7 74LS04 12 74LS04 10 74LS04 4 74LS04 2 SPARE GATES DUAL PORT RS-232↔422/485 SERIAL INTERFACE © Copyright 2000. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746