Pinout for DECserver 700-16 (rj45) is as follows

(connector with the clip at the bottom, numbering from left to right)

Pin                Function           Default

1                  RXD GND
2                  RXD
3                  TXD GND
4                  CTS                  CTS
                   RI
5                  RTS                  RTS
                   DSRS
6                  TXD
7                  DTR
8                  DSR                  DSR
                   DCD

NULL MODEM WIRING

RJ45 ------> DB25 || DB9
 2            2       3
 4            4       7
 5            5       8
 6            3       2
 7            6       6
 8            20      4
 1-3          7       5