3Com S200 manual Flow Control, Xon/Xoff

Page 65

ATPAD Ports

Flow Control

You can configure the ATPAD for either type of flow control:

•Control Signal

•XON/XOFF

If you select Control Signal, the port does not send data if the port's Pin 14 input is LOW. If the port wants to flow control the attached device, it sets its CTS output LOW.

If you configure the port for XON/XOFF, the port stops sending data if it receives the configured XOFF character. It resumes transmission when it receives an XON character. You can configure the XOFF and XON characters. If the port wants to flow control the attached device, it sends an XOFF character. Then it sends an XON character when it is ready to receive more data.

Caution!

If the port's message queue overruns because flow control is not in effect, the port discards data and this alarm is generated:

Pn - DATA DISCARDED

where: Pn - is the port identifier, and n is the port number.

Protocol Identifier You can use a Protocol Identifier to ensure that only calls from other devices using the same Protocol Identifier are accepted.

You configure a Protocol ID in the port record. The PID is inserted in the Call User Data field of all Call Request packets generated by the port. All incoming Call requests are checked for the presence of the same PID. If it is not present in the Call Request packet, the call is rejected.

If you leave the Protocol ID parameter blank, no PID is inserted in Call Requests, and there is no checking of incoming Call Request PIDs.

CUD and Facilities Call User Data (CUD) and facilities in incoming Call Request packets are ignored except for the PID. If you need to insert CUD and Facility fields in Call Request packets generated by the port, do this:

Step

Action

1Configure one of the Stored Addresses using the X.28 Call Command format.

2Insert the appropriate CUD and Facilities fields in the configured Call Command string.

3Use the ATDSn command referencing the correct Stored Address.

Configuring PAD/ATPAD Ports

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Contents 3Com Corporation Restricted Rights Legend Restricted Rights Notification for U.S. Government UsersProprietary Material Page Contents Page Overview Configuring PAD/ATPAD PortsIntroduction Before You BeginAbout Packet Assembler/Disassembler Example Typical ApplicationsPAD Port PAD Port ConfigurationConfiguration Record If You Specify or Set Then GuidelinesStep Action Result Use Connection Type When ParametersConnection Type Port Control Use Connection TypeAuto Baud Sequence Port SpeedCRONLY, CRDOTCR, TYMNET, Telenet CronlyDevice Parity Data Bits per CharacterNONE, SPAC, MARK, EVEN, ODD, Auto Number of Stop BitsNONE, AUTO, AUTC, PCUD, IBAR, OBAR, MNEM, Tmnem Call ControlCUGOA, BMSG, ADDR, FRCB, Cugia Terminal ControlNONE, PASS, LIM, CUG, LCPY, 7BIT, NADD, X.28, Cnui PAD Prompt Entry Number Autocall Timeout secRemote PAD Parameters Number Autocall MnemonicSubaddress Maximum Number of Autocall AttemptsGroup Subaddress CUG MembershipInvitation to clear Call Accept Timeout secBilling Records Protection Level Reconnection TimeoutNONE, CPONLY, Fulldcp Reconnection Tries LimitMaximum Receive Buffer Length Calling DTE PasswordCalled DTE Address Calling DTE IdentifierNUI verification timer PAD Command LanguageNUI Facility Format Max NUI violationsNONE, DISC, DEGR, Lock Action Type for NUI violationsInitiating an AutoCall Mnemonic Addressing PAD Port Configuration for AutocallingSdlc Mnemonic Autocall Addressing Sdlc Mnemonic AddressingPAD Port Configuration for Autospeed How It Works PAD XON/OFF Support Using X.25 Interrupt PacketsStep Action PAD Prompt Table Record Before You Begin Accessing the PAD Prompt Table RecordWhat You See This RecordPAD Prompt Text PAD Prompt Table Record ParametersEntry Number Introduction What You See In This Record PAD Profile Table RecordSelect PAD Profile Table from Configuration GuidelinesAccessing the PAD Profile Table Record #1, PAD Recall PAD Profile Table Record Parameters#3, Data Forwarding Character #4, Idle Timer Delay#2, Echo #5, Device Flow Control #6, Service Signals Control#10, Line Folding #7, Break Signal Operation#9, Padding After Carriage Return #13, Line Feed Insertion after CR #12, PAD Data Restraint#15, Editing #14, Padding after LF#16, Character Delete #17, Line Delete#19, Editing Type #18, Line Display#21 Parity Treatment #20, Echo Mask#100, Break Character #22, Page Wait#101, Echo Substitution Toggle Character #102, Echo Substitution Character#104, Xoff Character #105, Control Signal EIA-232-D Data Restraint#103, XON Character #108, Disconnect Character #107, Idle Disconnect Timer#106, Network Parity #109, Form Feed Padding #110, Esc Forwarding Delay Handling#113, Hewlett-Packard Flow Control #111, Echo Control#112, Dynamic Data Forwarding #115, Data Forwarding Criteria #114, PAD Mode#116, Short Timer Duration #119, DCD to Data Timer Duration #117, EIA Signalling Action#118, Message Assembly PAD Profile Table Copying PAD Profile Tables into a ConfigurationSize Select Copy/Insert RecordPrinter Parameter Name Default Test Simple TransparParameter Values Stored In Memory TPA Hpea Hpxon Host Rmot Parameter NameTPA Hpea Hpxon Host Rmot Message Parameter INT1984 IRANSP1PAD Bulletin Select Remote PAD Parameter Remote PAD Parameter Table RecordRemote PAD Parameter Table Record Parameters #1 Parameter Number #1 Parameter Value Function Detailed PAD Port StatisticsDescription Terms First Screen Screen Term Tells YouExample of Detailed PAD Port Statistics, Second Screen NullDescription Terms Second Screen Example of Detailed PAD Port Statistics, Third Screen Atpad Ports Data Forwarding Criteria Atpad OperationCriteria Descriptions If you want to Then useXON/XOFF Flow ControlAtpad Application Environment Network Parity Application Response Delay DTR TimeoutUse these guidelines when you enter Atpad commands ConfigurationConfigure Atpad Port Menu NULL, PAD, X25, SDLC, FRI, ATPAD, PPP Port TypePAD SIMP, DTRParity Data BitsNONE, SPAC, MARK, EVEN, ODD Stop BitsLine Feed Character Carriage Return CharacterBack Space Character Data Forwarding CharacterData Forwarding Timer Escape Sequence TimerXON Character NONE, CNTL, XoffPacket Size Answer ModeEcho Stored AddressesALPHA, NUM, None Result CodesAlpha Restricted Connection DestinationNONE, SPAC, MARK, Even Protocol IDNetwork Parity Atpad Port Statistics Screen Atpad Port StatisticsNull Description Terms Second Screen Technical Support Country Data Rate Telephone Number Access by Analog ModemCountry Telephone Number Support from3Com Country Telephone Number Fax Number ReturningIndex SymbolsNumerics ApadIndex-2 URL Sdlc
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S200 specifications

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