JUNE 2000 IC058C IC183C RS-422/485 Serial Interface Plus, 4-Port 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.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT TRADEMARKS All applied-for and registered trademarks are the property of their respective owners. Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners. EMC Directive Statement Products bearing the CE label fulfill the requirements of the EMC directive (89/336/EEC) and of the low-voltage directive (73/23/EEC) issued by the European Commission.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Contents 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 What’s Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Factory-Default Settings . . . . . . . . . . . . . . . . . . . . . .
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Appendix A: Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . 27 Appendix B: Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Appendix C: Electrical Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Appendix D: Asynchronous Communications . . . . . . . . . . . . . . . .
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 1. Specifications Communication Chip — IC058C: 16750 UART; IC183C: 16950 UART Maximum Distance — 4000 ft. (1219.2 m) Operation — 2- or 4-wire Protocol — Asynchronous Speed — IC058C: Up to 460.8 kbps; IC183C: 460.8 kbps and above Connectors — (1) DB37 male, (4) DB9 male on included cable CE Approval — The unit is CE approved Manufacturing — IPC 610-A Class-III standards are adhered to with an 0.1 visual A.Q.L. and 100% Functional Testing.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 2. Introduction 2.1 Overview The RS-422/485 Serial Interface Plus, 4-Port provides the PC with four additional RS-422/485 serial ports for terminals, modems, printers, etc. The Card is RS-485 compatible without special software or drivers. This ability is especially useful in Windows®, Windows NT, and OS/2® environments where the lower-level I/O control is abstracted from the application program.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT To install the Card using factory-default settings, refer to Chapter 4, Installation. For your reference, record installed Card settings below: Table 2-2. Your Installed Card Settings. Port # Base Address IRQ Electrical Specifications Port 1 Port 2 Port 3 Port 4 2.4 Technical Description The IC058C Card uses the 16750 UART. This chip features programmable baud rate, data format, and interrupt control, and a 16-byte input and output FIFO.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 2.4.2 MODEM CONTROL SIGNALS Some software packages require the use of modem handshake signals such as CTS or DCD. Refer to your application software manual to determine the requirements for modem control signals. If no requirements are mentioned, a safe configuration is to tie DTR to DSR and DCD, and tie RTS to CTS. This configuration will typically satisfy the modem control-signal requirements for most communications software. 2.4.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 3. Card Setup The RS-422/485 Serial Interface Plus, 4-Port Card has several jumper straps which must be set for proper operation. 3.1 Address Selection Each port on the Card occupies eight consecutive I/O locations. A DIP switch is used to set the base address for these locations.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Table 3-1. Available Address Combinations. Switch 6 Switch 7 Switch 8 Port 1 Port 2 Port 3 Port 4 On On Off 3F8 2F8 3E8 2E8 On Off On 2F8 3E8 2E8 2E0 On Off Off 3E8 2E8 280 288 Off On On 500 508 510 518 Off On Off 580 588 590 598 Off Off On 1500 1508 1510 1518 Off Off Off 3220 3228 4220 4228 On On On Addresses set up by switches 1-5 NOTE Each COM: port in the system should have a unique address.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Table 3-2. Address Selection Table. Address lines A9 A8 A7 A6 A5 Address Selected 1 2 3 4 5 280-29F Off On Off On On 2A0-2BF Off On Off On Off 380-39F Off Off Off On On 1A0-1BF On Off Off On Off 2E0-2FF Off On Off Off Off Figure 3-1 shows the correlation between the DIP-switch setting and the address bits used to determine the base address. In the example below, address 2E0 is selected as a base.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Table 3-3. Port to Connector Table. Port # Connector Location Address Example (Base=2E0) 1 1 Base+0 2E0-2E7 2 2 Base+8 2E8-2EF 3 3 Base+16 2F0-2F7 4 4 Base+24 2F8-2FF 3.2 Jumper Selections For ease of configuration, the headers are grouped by port. Port 1 headers have a “J1” prefix, Port 2 headers have the “J2” prefix, etc.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 3 4 5 6 7 9 10 11 12 15 Figure 3-2. Headers J1B – J4B, 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 J1A through J4A. Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper. 3.4 Interrupt Modes Headers J1A through J4A select the interrupt modes for each port.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Set the jumpers to “S” for shared interrupt mode on all blocks sharing an IRQ except one. Set that port block for “M.” This provides the pull-down resistor circuit that makes sharing IRQs possible. If you are using more than one Serial Interface Plus Card or a compatible adapter in a bus you should only have one port set to “M.” Figure 3-4 shows two ports sharing a single IRQ. J1A N S M N S M J2A Figure 3-4. Header J1A & J2A, Shared IRQ Mode.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 3.5 RS-485 Enable Modes RS-485 is ideal for multi-drop or network environments. RS-485 requires a tristate driver (not dual-state) that will allow the electrical presence of the driver to be removed from the line. The driver is in a tri-state or high-impedance condition when this occurs. Only one driver may be active at a time and the other driver(s) must be tri-stated.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT AT RT NE 3.6 Interface Mode Examples J1D – J4D AT RT NE Figure 3-5. Headers J1D - J4D, RS-422. Figure 3-6. Headers J1D - J4D, RS-485 “Auto” Enabled, with “No Echo.
AT RT NE RS-422/485 SERIAL INTERFACE PLUS, 4-PORT AT RT NE Figure 3-7. Headers J1D - J4D, RS-485 “Auto” Enabled, with “Echo.” Figure 3-8. Headers J1D - J4D, RS-485 “RTS” Enabled, with “No Echo.
AT RT NE RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Figure 3-9. Headers J1D - J4D, RS-485 “RTS” Enabled, with “Echo.” 3.7 Line Termination Typically, each end of the RS-485 bus must have line-terminating resistors (RS-422 terminates at the receive end only). A 120-ohm resistor is across each RS-530/422/485 input in addition to a 1-Kohm pull-up/pull-down combination that bias the receiver inputs. Headers J1E through J4E allow the user to customize this interface to their specific requirements.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Table 3-4. Jumper Functions. Name Function P Adds or removes the 1-Kohm pull-down resistor in the RS-422/RS-485 receiver circuit (Receive data only). P Adds or removes the 1-Kohm pull-up resistor in the RS-422/RS-485 receiver circuit (Receive data only). T Adds or removes the 120-ohm termination. L Connects the TX- to RX- for RS-485 two-wire operation. L Connects the TX+ to RX+ for RS-485 two-wire operation. 3.
DIV1 DIV2 DIV4 RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Figure 3-11. Clocking Mode “Divide By 4.” DIV1 DIV2 DIV4 To double these rates up to a maximum rate for 230.4 kbps, place the jumper in the “divide by 2” (silk-screen DIV2) position. Figure 3-12. Clocking Mode “Divide By 2.” To select the maximum data rate (460.8 kbps) place the jumper in the “divide by 1” (silk-screen DIV1) position.
DIV1 DIV2 DIV4 RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Figure 3-13. Clocking Mode “Divide By 1.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 4. Installation IMPORTANT You MUST set up the operating system BEFORE you physically install the Card. 4.1 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. 4.1.1 WINDOWS 3.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 4.2 Hardware Installation The RS-422/485 Serial Interface Plus 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.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 5. Troubleshooting Two Serial Utility Diskettes are supplied with the adapter and will be used in the troubleshooting procedures. By using this diskette and following these simple steps, most common problems can be eliminated. If you still cannot solve your problem, call Black Box technical support at 724-746-5500. 1. Identify all I/O adapters currently installed in your system. This includes your on-board serial ports, controller cards, sound cards etc.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT 6. The following are known I/O conflicts: • The 278 and 378 settings may conflict with your printer I/O adapter. • 3B0 cannot be used if a Monochrome adapter is installed. • 3F8-3FF is typically reserved for COM1: • 2F8-2FF is typically reserved for COM2: • 3E8-3EF is typically reserved for COM3: • 2E8-2EF is typically reserved for COM4: 7. Please refer to your included diskette for any post production manual updates and application specific information. 8.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Appendix A: Connector Pin Assignments Table A-1. DB9 Pin Assignments.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Table A-2. DB37 Pin Assignments.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Appendix B: Board Layout Y1 C1 R1 D1 R2 D2 R3 D3 R4 D4 R5 3 4 5 6 7 9 10 11 12 15 N S M 3 4 5 6 7 9 10 11 12 15 N S M 3 4 5 6 7 9 10 11 12 15 N S M U1 74LS74 PORT1= J1x PORT2= J2x PORT3= J3x PORT4= J4x J1A J1B J2A J2B J3A J3B N S M 3 4 5 6 7 9 10 11 12 15 J1C J2C J3C J4C C4 + C5 U4 C7 U7 C9 RP1 MACH215 RP2 SWITCH8DIP U8 U9 C12 MACH215 J1D J4D J3D J2D SW1 C10 74HC04 75175 U13 75174 U12 RP3 U11 R6 R7 R8 R9 U16 74LS245 C14
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Appendix C: Electrical Interface RS-422 The RS-422 specification defines the electrical characteristics of balancedvoltage digital interface circuits. RS-422 is a differential interface that defines voltage levels and driver/receiver electrical specifications. On a differential interface, logic levels are defined by the difference in voltage between a pair of outputs or inputs.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT Appendix D: Asynchronous Communications In serial data communications, individual bits of a character are transmitted consecutively to a receiver that assembles the bits back into a character. Data rate, error checking, handshaking, and character framing (start/stop bits) are pre-defined and must correspond at both the transmitting and receiving ends.
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT An extra bit used for error detection is often appended before the stop bits. This special bit is called the parity bit. Parity is a simple method of determining if a data bit has been lost or corrupted during transmission. There are several methods for implementing a parity check to guard against data corruption. Common methods are called (E)ven Parity and (O)dd Parity. Sometimes parity is not used to detect errors on the data stream.
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