3Com CS/2500 manual Txd

Page 90

A-2 APPENDIX A: PIN ASSIGNMENTS

The table also lists pins assigned for RS-422 functions, when the port is configured for RS-422 in the firmware. You can use the table as a reference for cables supplied by 3Com.

CAUTION: A chassis ground connection between the communications server and customer equipment is strongly recommended. This connection minimizes the potential for equipment damage caused by electrostatic discharges. On models CS/2500 and CS/2600, the chassis ground connection on serial ports can be made only through the connector headshells. Do not use pin 1 for this connection, since it is not connected to the chassis.

Table A-1 RS-232 Serial Port Pin Assignments

 

RS-232-

3Com

 

Failsafe

 

Pin

D Name

Name

Direction

State

Function

 

 

 

 

 

 

1

Not used

2

BA

TXD

In

Break

Transmit Data

3

BB

RXD

Out

Receive Data

4

CA

RTS

In

True

Request to Send

5

CB

CTS

Out

Clear to Send

6

CC

DSR

Out

Data Set Ready

7

AB

GND

Signal Ground

8

CF

DCD

Out

 

Received Line Signal

 

 

 

 

 

Detector (Data Carrier

 

 

 

 

 

Detect)

9–10

Not used

11*

DTE

DCE

In

DCE Data Set Ready

 

DSR

DSR

 

 

 

12

Not used

13

TXD-B

In

Break

RS-422 Transmit Data

14

TXD-A

In

Break

RS-422 Transmit Data

15

DB

TXC

Out

Transmit Clock

16

RXD-A

Out

RS-422 Receive Data

17

DD

RXC

Out

Receive Clock

18

Not used

19

RXD-B

Out

RS-422 Receive Data

20

CD

DTR

In

False

Data Terminal Ready

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Contents CS/2500 Series 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Iii Page Contents Installation Maintenance and Upgrades PIN Assignments Technical Support Page Figures Tables Audience About this GuideIntroduction ConventionsThis Typeface Italics Italics are used to denote new terms or emphasis About this Guide Overview FeaturesFeatures Ten standard RS-232-D electrical interfacesSoftware CompatibilitySW/2500, can be used only with the CS/2500 and CS/2600 Chassis Panel, see Back Panel onHardware Interrupt Front Panel Its +5 V DC output Power supply module and three types of connectors Back PanelCS/2500 and CS/2600 back panel, shown in -5, contains Overview Back Panel Overview Specifications Optional RackMount Kit VAC Installation Do the following before beginning the installationPreparation Installation Install brackets Cabling the Server To the NetworkTurning on the server All ports are set to terminal SETDefault -TERM DeVice = Installation Slide-lock connection on the server End to the transceiverInstall brackets Configuration, and Appendix C, Monitor Utility ConfigurationAC power source must meet the requirements outlined ModifyingInstallation Startup Guide or software release notes Rbcs files Booting fromDiskette DisketteStartup 3Com Corporation CS/2000 Series Monitor Reading...OK Insert copy and hit return to continue Parameter changes Messages Boot ProblemsNormal Startup Shutting DownShutting Down Startup Configuration EnteringFirmware Monitor Configuration Procedure ChangingFollowing menu is displayed SLP Changing the Configuration Configuration Changing the Configuration SLP, and Trivial File Transfer Protocol Tftp Used with 3Com Network Control Servers NCSs Com no longerNext section Type B Change IP/TFTP Parameters menu appears TftpConfiguration Bootp Emulating a CS/2000 or CS/2100Software and to operate in mixed environments Changing Port Configuration Changing Port Configuration Configuration 3Com recommends the following procedures for preventive Maintenance and UpgradesMaintenance MaintenanceMaintenance and Upgrades Maintenance Reinstall the fuseholder cartridge in the receptacle Upgrades Upgrade procedures require you to remove the server coverRemoving the Server Cover Grasp both sides of the cover and carefully lift it off Rear8-F Pull taut to expose screw Voltages. There are no user-serviceable parts inside Upgrades Remove Connector from Each pin must be inserted properly into its socket EPROM. Each pin must be inserted properly into its socket Replace the cover, as described in the next sectionUpgrades Maintenance and Upgrades Troubleshooting Troubleshooting Operating Problems Troubleshooting Procedures Memory DumpEnter the density of the dump diskettes Return to use the default density 2mb Troubleshooting Figure A-1 Serial Connector Pin Numbering PIN AssignmentsTXD DTE Transceiver DO-S Slct Startup Messages Appendix B Startup Messages You can access the monitor in either of the following ways Monitor UtilitySet the Auto-reboot parameter to Boot monitor Continuous Self-Test and Initial Boot Source parametersNonfunctional Become nonfunctional, enter the following command Memory dumps, refer to Memory Dump Procedures on-2 on page 1-4. The switch is recessed into a round hole to Dump Procedures onSyntax BT Filename and address parameters specify the name Procedures onUsing this menu, refer to , Configuration From memory locationDescription Repeats the previous command Technical Support Services3Com Bulletin Board Service 3ComBBS On-line TechnicalPress Return to see the ThreeComForum main menu Country Telephone Number Hong Kong 852 2537 44 1442 408 727 Appendix D Technical Support Returning Products For RepairSender’s expense To obtain an RMA number, call or fax 10/25/95 Index NumericsCover Index Index Index Index Limited Warranty Bayfront Plaza Santa Clara, CA 408 764-5000 1/1/94