What are the pinouts for a serial printer?

While the control lines of the RS 232 interface were originally intended for call setup and takedown, other "handshakes" may be required by one or the other device. These are used for flow control, for example, to prevent loss of data sent to a serial printer. For example, DTR is commonly used to indicate "device ready". Pins may also be "jumpered" or routed back within the connector. For example a pin saying "are you ready?" from device A might be wired to the pin saying "I'm ready" on device A if device B did not transmit such a signal. Common handshake pins are DTR, DSR, DCD, and RTS/CTS.