9-2
Hardware Handshaking Signals. The four handshaking signals used to control the data flow
are RTS/CTS and DTR/DCD. The 2700 drives RTS when it wishes to transmit and waits for
CTS before transmitting each character. Likewise, the 2700 asserts DTR when it is ready to
receive data and receives only when DCD is asserted. DSR is not used.
Software Handshaking Signals. In the XON/XOFF handshaking protocol, RTS and DTR are
always asserted and CTS and DCD are always ignored.
Since the 2700 acts as a DTE, it requires a shielded NULL modem cable to connect to another
DTE, such as the PC. Figure 9.2 and Figure 9.3 show possible NULL modem cable
connections.
Figure 9.2
Full Handshaking DTE Interface
Figure 9.3
Three Wire DTE Interface
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