Modular(RJ-45) to DB25(RS-232) Adapter When looking at the back of the modular receptacle(not the cord/jack, X X X X ---- 8 6 4 2 note the numbering! X X X X ----- 7 5 3 1 If looking at the female port(receptacle, like a phone outlet in a wall), with the slot for the locking snap piece on the bottom, the wires are numbered from left to right, 1 2 3 4 5 6 7 8. This is a TRW RS-232 Adapter part # 232 21 25 007. The cross connections are as follows: RJ-45 DB25 --------------------------- 1 ------------ 1 2 ------------ 4 3 ------------ 3 4 --------|--> 6 |--> 8 5 ------------ 5 6 ------------ 20 7 ------------ 7 8 ------------ 5 Please hit any key to continue. Press F1 for help!