Advanced Configuration Parameters
The following advanced configuration parameters are available:
- Flow Control
- Select the method for controlling the flow of data between the
emulator and the modem or the ASCII host. The choices are:
- XON/XOFF
- The software flow control method places the characters DC3 and DC1 into the data stream to stop and start the flow of data. This method, no longer common, allows the session user to pause incoming data for reading, by using the Control-S and Control-Q keys. DC3 is X'13', or XOFF; it is initially mapped to Control-S. DC1 is X'11', or XON; it is initially mapped to Control-Q. The keyboard positions are remappable.
- Hardware
- The hardware flow control method uses the electrical signals RTS (Request to Send) and CTS (Clear to Send). If your modem is using high-speed data compression, or if you are performing XMODEM or YMODEM file transfers, this method is mandatory.
- Both
- This method uses both hardware and XON/XOFF flow control; it is the default.
- None
- If you select None there is no flow control.
- XOFF Point
- For software flow control, the XOFF point is the level (in bytes) at which the XOFF signal is sent to the modem or ASCII host. The options (64, 256, 512, and 1024) specify the space remaining in the buffer. For example, if you select 64, the XOFF signal is sent when 64 bytes of space remain in the buffer.
- Modem Signal Detection
- Select the method that the VT emulator will use to determine
whether data can be sent on the asynchronous line. The options are:
- None
- The VT emulator will assume that the line is ready, ignoring CD, CTS and DSR.
- Ignore CD
- The VT emulator will ignore Carrier Detect, which some modems artificially force high. Use this option if your host is connected through a null modem cable; most null modems do not support CD.
- All
- The VT emulator will monitor CD, CTS (Clear to Send) and DSR (Data Set Ready).
- Break Signal Length
- The break signal is an intentional framing error on the asynchronous line, used as an attention signal to the host. Some hosts expect the break to be a particular length. The default value is 250 milliseconds. The other options are 500, 1000, and 2000 milliseconds. Select the value required by your host.