It is PC version of Nissan hand held Pocket PC Consult.
It is used on all NISSAN grey 14pin Digital Data Link (DDL). It is usually located near the fuse box on driver side.
The cars are usually built from year 1989 to 2000. Such as Cefiro, Sentra, Infinity, Maxima,300ZX,Z32, 240SX,S13, S14, Skyline, SR20DE, SR20DET, RB20, Altima, and Fairlady.