Conclusion (Transparent XON/XOFF)

When properly implemented, Transparent XON/XOFF Local Flow Control permits a fully-functional flow-controlled interface even when only three conductors are present (TD, RD, and Signal Ground). Versatile software may do the following:

1. Use the &T19 cable test feature of Hayes Vseries modems to determine whether RTS/CTS flow control is available

2. Select &K5 operation for Transparent XON/XOFF flow control if RTS/CTS is unavailable.

Selecting transparent XON/XOFF flow control allows the user to continue data transfer using any protocol or data contents without concern for possible interference with the XON/XOFF flow control scheme.

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