Standard pinout for RS-422?
From Wikipedia:


  RS-422 only specifies the electrical signaling characteristics of a single balanced signal.  Protocols and pin assignments are defined in other specifications.  The mechanical connections for this interface are specified by EIA-530 (DB-25 connector) or EIA-449 (DC-37 connector), however devices exist which have 4 screw-posts to implement the transmit and receive pair only.  The maximum cable length is 1500 m. Maximum data rates are 10 Mbit/s at 12 m or 100 kbit/s at 1200 m. RS-422 cannot implement a truly multi-point communications network such as with EIA-485, however one driver can be connected to up to ten receivers.


So, according to the Wiki, there indeed is no standard for the pin assignments of RS-422 on a DB-9 connector.

In addition to that, different websites say different things:



So there probably indeed is no standard.