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SeaLevel ULTRA COMM+I.PCI 3055, Руководство пользователя

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Appendix D - Asynchronous Communications  

Sealevel Systems 

ULTRA

 

COMM+I.PCI

 Page 

15

 

Appendix D - Ground Loop Phenomenon 

What is Ground Loop? 

Ground loop Phenomenon occurs when two (or more) pieces of equipment are 
connected together with a common ground and a different ground potential 
exists at each location. This current can cause the connected equipment to 
experience noise that in turn causes data transmission errors. In the extreme this 
ground current can cause equipment malfunction or even destruction. 

Cabling Recommendations 

When connecting the 

ULTRA COMM+I.PCI

 in a RS-485 network, care should 

be taken that both ends of the network are not isolated from ground (see Figure 
8). This “floating” ground condition could cause the capacitive or inductive 
coupling of voltages that will cause a break down in the DC to DC converter 
circuit or in the opto-isolator circuit. This condition will cause data errors and 
possibly destruction of the receiver circuit. 

A

B

Isolation

Barrier

DATA+

DATA-

Ground

Isolated 

Adapter

Non

Isolated 

Adapter

 

Figure 8 – 

ULTRA COMM+I.PCI

 cabling example 

 

Содержание ULTRA COMM+I.PCI 3055

Страница 1: ...ULTRA COMM I PCI USER MANUAL Part 3055 Sealevel Systems Inc Telephone 864 843 4343 PO Box 830 Fax 864 843 3067 Liberty SC 29657 USA www sealevel com ...

Страница 2: ...ating Systems 7 SYSTEM INSTALLATION 7 TECHNICAL DESCRIPTION 8 CONNECTOR PIN ASSIGNMENTS 9 RS 232 Signals DB 25 Male 9 RS 422 485 530 Pin Assignments DB 25 Male 9 SPECIFICATIONS 10 ENVIRONMENTAL SPECIFICATIONS 10 MANUFACTURING 10 POWER CONSUMPTION 10 MEAN TIME BETWEEN FAILURES MTBF 10 PHYSICAL DIMENSIONS 10 APPENDIX A TROUBLESHOOTING 11 APPENDIX B HOW TO GET ASSISTANCE 12 APPENDIX C ELECTRICAL INTE...

Страница 3: ...gures Figure 1 RS 232 2 Figure 2 RS 422 2 Figure 3 RS 485 4 Wire with Echo 2 Figure 4 RS 485 2 Wire with Echo 2 Figure 5 RS 485 2 wire without Echo 3 Figure 6 RS 485 Enable modes 4 Figure 7 Clocking Modes 5 Figure 8 ISO COMM 2 cabling example 15 Figure 9 Asynchronous Communications Bit Diagram 16 Sealevel Systems Inc SL9161 Revision 7 2006 Sealevel Systems Incorporated All rights reserved ...

Страница 4: ...orts in any of the interface combinations to provide maximum flexibility to your application Optional Terminal Block adapters are available to simplify field wiring connections In both RS 232 and RS 422 modes the card works seamlessly with the standard operating system serial driver In RS 485 mode our special auto enable feature allows the RS 485 ports to be viewed by the operating system as a COM...

Страница 5: ...es SW1 Please use the following examples to configure your adapter Figure 1 RS 232 Figure 2 RS 422 Figure 3 RS 485 4 Wire with Echo Figure 4 RS 485 2 Wire with Echo 1 2 3 4 5 6 7 ON OFF 8 9 10 1 2 3 T P P L L E RS 232 1 2 3 4 5 6 7 ON OFF 8 9 10 1 2 3 T P P L L E RS 422 1 2 3 4 5 6 7 ON OFF 8 9 10 1 2 3 T P P L L E 4 Wire RS 485 W Echo 1 2 3 4 5 6 7 ON OFF 8 9 10 1 2 3 T P P L L E 2 Wire RS 485 W ...

Страница 6: ...orresponds to a specific portion of the interface If multiple ULTRA COMM I PCI adapters are configured in a RS 485 network only the boards on each end should have jumpers T P P ON Refer to the following table for each position s operation Name Function T Adds or removes the 120 ohm termination P Adds or removes the 1K ohm pull down resistor in the RS 422 RS 485 receiver circuit Receive data only P...

Страница 7: ...OMM I PCI in an RS 485 application with existing i e standard RS 232 software drivers Switch SW2 is used to control the RS 485 mode functions for the driver circuit The selections are RTS enable silk screen RT switch position 4 or Auto enable silk screen AT switch position 3 The Auto enable feature automatically enables disables the RS 485 interface The RTS mode uses the RTS modem control signal t...

Страница 8: ...des are selected at switches SW 2 To select the Baud rates commonly associated with COM ports i e 2400 4800 9600 19 2 115 2K Bps set switch position 2 to the On position silk screen D4 To select the maximum data rate 460 8K bps set switch position 1 to the On position silk screen D1 Figure 7 Clocking Modes D 1 D 4 A T R T 1 2 3 4 ON OFF SW2 Divide by 1 mode Divide by 4 mode 1 2 3 4 ON OFF D 1 D 4 ...

Страница 9: ...te 1200 bps 300 bps 2400 bps 600 bps 4800 bps 1200 bps 9600 bps 2400 bps 19 2K bps 4800 bps 57 6 K bps 14 4K bps 115 2 K bps 28 8K bps 230 4K bps 57 6K bps 460 8K bps 115 2K bps If your communications package allows the use of Baud rate divisors choose the appropriate divisor from the following table For this Data Rate Choose this Divisor 1200 bps 384 2400 bps 192 4800 bps 96 9600 bps 48 19 2K bps...

Страница 10: ...re System Installation The ULTRA COMM I PCI can be installed in any of the PCI expansion slots and contains several jumper straps for each port that must be set for proper operation 1 Turn off PC power Disconnect the power cord 2 Remove the PC case cover 3 Locate an available PCI slot and remove the blank metal slot cover 4 Gently insert the ULTRA COMM I PCI into the slot Make sure that the adapte...

Страница 11: ...85 for industrial automation and control applications Isolation is important in installations where the equipment being connected to the PC is either far from the PC or on a different power transformer circuit Ground loop current is a commonly neglected and misunderstood phenomenon that leads to data loss and the destruction of communications interfaces The ULTRA COMM I PCI utilizes the 16C850 UAR...

Страница 12: ...The most common way to do this is connect RTS to CTS and RI Also connect DCD to DTR and DSR Terminating these pins if not used will help insure you get the best performance from your adapter RS 422 485 530 Pin Assignments DB 25 Male Signal Name Pin Mode GND Ground 7 RDB RX Receive Data Positive 16 Input RDA RX Receive Data Negative 3 Input CTSB CTS Clear To Send Positive 13 Input CTSA CTS Clear To...

Страница 13: ...ing All Sealevel Systems Printed Circuit boards are built to UL 94V0 rating and are 100 electrically tested These printed circuit boards are solder mask over bare copper or solder mask over tin nickel Power Consumption Supply line 5 VDC Rating 380 mA Mean Time Between Failures MTBF Greater than 150 000 hours Calculated Physical Dimensions Board length 4 90 inches 11 684 cm Board Height including G...

Страница 14: ...s allow the sharing of IRQs many other adapters i e SCSI adapters on board serial ports do not The IRQ is typically selected via an on board header block Refer to the section on Card Setup for help in choosing an I O address and IRQ 4 Make sure the Sealevel Systems adapter is securely installed in a motherboard slot 5 When running DOS or Windows 3 x refer to the supplied Sealevel Software and this...

Страница 15: ... a computer ready to run diagnostics 3 Sealevel Systems maintains a Home page on the Internet Our home page address is www sealevel com The latest software updates and newest manuals are available via our FTP site that can be accessed from our home page 4 Technical support is available Monday through Friday from 8 00 a m to 5 00 p m eastern time Technical support can be reached at 864 843 4343 RET...

Страница 16: ...nary logic states The RS 232 and the EIA TIA 574 specification define two types of interface circuits Data Terminal Equipment DTE and Data Circuit Terminating Equipment DCE The ULTRA COMM I PCI is a DTE device RS 422 The RS 422 specification defines the electrical characteristics of balanced voltage digital interface circuits RS 422 is a differential interface that defines voltage levels and drive...

Страница 17: ... 32 drivers and 32 receivers to be connected to one line This interface is ideal for multi drop or network environments RS 485 tri state driver not dual state will allow the electrical presence of the driver to be removed from the line Only one driver may be active at a time and the other driver s must be tri stated RS 485 can be cabled in two ways two wire and four wire mode Two wire mode does no...

Страница 18: ...s ground current can cause equipment malfunction or even destruction Cabling Recommendations When connecting the ULTRA COMM I PCI in a RS 485 network care should be taken that both ends of the network are not isolated from ground see Figure 8 This floating ground condition could cause the capacitive or inductive coupling of voltages that will cause a break down in the DC to DC converter circuit or...

Страница 19: ...sion of a pre defined number of stop bits usually 1 1 5 or 2 An extra bit used for error detection is often appended before the stop bits Remain Idle or next start bit Odd Even or Unused STOP P BIT 5 to 8 Data Bits Idle state of line 1 0 1 1 5 2 Figure 9 Asynchronous Communications Bit Diagram This special bit is called the parity bit Parity is a simple method of determining if a data bit has been...

Страница 20: ...Appendix F Silk Screen Sealevel Systems ULTRA COMM I PCI Page 17 Appendix F Silk Screen 3 5 4 9 ...

Страница 21: ...rference at his own expense 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 To obey these directives the following European standards must be met EN55022 Class A Limits and methods of measurement of radio interference characteristics of information technology ...

Страница 22: ... use this product Sealevel Systems will not be liable for any claim made by any other related party RETURN AUTHORIZATION MUST BE OBTAINED FROM SEALEVEL SYSTEMS BEFORE RETURNED MERCHANDISE WILL BE ACCEPTED AUTHORIZATION CAN BE OBTAINED BY CALLING SEALEVEL SYSTEMS AND REQUESTING A RETURN MERCHANDISE AUTHORIZATION RMA NUMBER Sealevel Systems Incorporated 2779 Greenville Highway P O Box 830 Liberty SC...

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