NULL MODEMS.pdf

(71 KB) Pobierz

2395DS.PDF

232NM2395 - pg. 1/1

NULL MODEMS

Document No. 232NM2395

Null Modems are used to interconnect two computers with similar RS-232 ports. If

both ports are DTE or both DCE you cannot connect them directly together. You need a

Null Modem to cross pins 2 and 3 (TD and RD) and to loop back the handshake lines. The

following diagrams show the four main null modem adapters.

1993 B&B Electronics - Revised June 1993