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Even though RS232 is meant for bi-directional serial communication, the serial communications software documentation defines the device (DTE or DCE) as the transmitter. Most modem software was also developed this way, but some professional networks did not use RS232 correctly and DTE devices connected to them were required to listen to the incoming transmit signals. This can now be somewhat remedied with the RS232-to-RS232 cables that contain a DSR signal. RS232-to-RS232 cable with a DSR capability uses the same pin for signal transmission as for DRSR. The RS232 pin layout shown in the vendor provided pinout is the RS232-to-RS232 version using two sets of pins. The pins marked with * are for the second or RS232 mode.

RS422 was developed as a faster alternative to RS232. No handshaking was used and no protection against amplitude or voltage swings was needed. A separate option for single ended or two-way communication was part of the RS422 specification. It was implemented on a number of specific modem models. The DB25 or DB9 connector pins used for RS422 serial communication are color coded in yellow. The pins on the connector do not have a readily apparent designation. Instead, the color codes are printed on the cable itself. So-called UART cables use the same pinout as DB25 serial connectors, except for pin 6 with a GS-UART. This pin provides a transmit-only option. d2c66b5586