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.
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.
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.
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.
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.............................................................................
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.
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.
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.
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.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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
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 U11-1
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