Boundless Technologies ADDS 3153 ASCII manual Communications, Receive Flow Control

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Communications 7

Communications

This terminal is equipped with three ports. The two serial ports are intended for connection to either a host/modem or a serial printer. The remaining port is a Centronics-compatible printer port. The port you use as the printer port depends on whether you have a serial or a parallel interface to the printer. Another factor affecting your port selection is your choice of connecting the terminal to one or two host computers.

The first host/printer serial port (SES1-EIA) can communicate with your computer or printer at a baud rate of 110 to 134,400 baud (bits per second). The second host/printer serial port (SES2-AUX) can communicate at speeds from 110 baud to 38,400 baud. Either port can be used to connect to a host computer/modem or serial printer.

In single host mode, you have the choice to use the second serial port or to use the parallel printer port, as your printer interface. In dual host mode, the natural choice is to use the parallel port, although other options are available (See the “Installation” chapter). Refer to the following sections for further information on these ports.

Receive Flow Control

Because devices can receive data faster than they can process it, data flow control (selectable in the PORTS menu of Setup) should be used to prevent data loss. Software flow control relies on the Xon and Xoff characters (“g” and “e” characters in Scan Code Key mode) to indicate when the terminal is able or unable to store further data. The Xon signal transmits the DC1 character (11h) and the Xoff signal transmits DC3 (13h).

The terminal’s receive buffer can store 1024 bytes (characters). When “EIA (or Aux) Rcv” in the Setup menu for PORTS is “Xon-Xoff,” the terminal issues an Xoff character, indicating to the host that it should stop transmitting a. The terminal will then continue to process data until its receive buffer is empty. It will then issue an Xon character to the host, indicating that it can resume sending data to the terminal.

If the “EIA (or Aux) Rcv” is “No Protocol” in Setup, the terminal will continue to accept characters into its receive buffer until it is full. Additional characters will be lost. Xon-Xoff protocol must also be set on the host computer or printer for proper handshaking.

In addition to software “receive” flow control (Xon-Xoff), the serial host/printer ports support “receive” hardware flow control. The SES1-EIA port has an outgoing DTR (Data Terminal Ready) signal. If “EIA Rec” is “DT” in Setup, and the terminal’s receive buffer fills to the level mentioned above, the terminal will set the DTR signal low to inform the (serial) host device to stop sending data. On the SES2- AUX port, the incoming DSR (Data Set Ready) signal serves to signal the host (serial) device that the terminal is not ready to receive more data, if “Aux Recv” is “DSR” in Setup.

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Contents Adds 3153 Ascii Display Terminal Page Contents Ascii Emulations Ansi Emulations IBM Emulation Tabs F10 Answerback F11 Program F12 Preface This guide Adds 3153 Programmer’s Reference ManualUSA and Canada calls 800-231 International calls NumberHow to Connect/Disconnect the Terminal To DisconnectTrademarks and Service Marks SCOCanadian Department of Communications Compliance Statement Electronic Emission NoticesFederal Communication Commission FCC Statement Korean Government Ministry of Communication MOC Statement Safety Notices Xii Preface Features CompatibilityDesk Accessories DisplayCharacter Sets CommunicationsPhysical Features KeyboardsIntroduction Features Key PC Keyboard US Ansi Keyboard Usage Notes Communications Receive Flow ControlTransmit Flow Control Host/Printer Port 1 RS-232-C or RS-422 Terminal to Modem DCE or Host Host/Printer PortParallel Printer Port Terminal to Host DTE or Printer Viewports Screen Display and PagesBottom Status/Label Line Display Visual Effects of Screen and Page Lengths Introduction Know Your Devices Physical ConnectionsNumber of Sessions Selection Linking Ports to SessionsCommunications Setup Selections No Printer OptionKnow Your Serial PortS Protocol Connection a Host DCEConnection B Host DTE Connection C RS-232 with ModemConnection D RS-232-C with Modem Connection E PrinterEmulation Setup Selection Additional Setup OptionsSave Parameters Establish CommunicationsCommon Setups Host/Printer Connection GuideSES1-EIA DTE SES2-AUX DCE PAR User Settings Adds VP Overview Entry and ExitSaving Parameters Movement Inside MenusDual Session Mode Action FieldsSetup Map Key Menu Parameters AvailableANSI-ID Quick F1 Emulation=IBMGeneral F2 Enhanced On, OffAuto Wrap On, Off Display F3 Width Change Clear On, Off Keyboard F4 Keys F5 Return Key Repeat On, Off Enter Key can be defined to be either a Send or Return Key Select the characters sent by the tic/tilde key Ports F6 See the Quick menu earlier in this chapterHost F7 Print F8 Emulation F9 Ascii EmulationsSetup Save Labels Off, On Ansi Emulations IBM EmulationSet Control Temporary, Permanent Tabs F10 Answerback F11 Program F12 Keys = F1When Program = Edit Key or Sh-Edit Key, the choices are Execute Prnt Sc Save TerminalEdit Fields Glossary of Terms Reset Session ParametersDesk Accessories Desk Accessory MenuExit Keystrokes Direct AccessInhibiting Access Calendar ClockCalculator Page Ascii Chart Diagnostic Menu Appendix Local KeysLocal Keys Local Keys Local Keys Configurations-Single and Dual Session User’s Notes Page Technical Support

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