mvadh@cbnews.ATT.COM (andrew.d.hay) (04/27/90)
In article <132@bongo.UUCP> julian@bongo.UUCP (Julian Macassey) writes: "In article <12@lysator.liu.se>, aronsson@lysator.liu.se (Lars Aronsson) writes: "> "> I was planning on going modular for my RS232 serial lines and was "> looking for standard, but there seems to be none. [] " A gotcha. Some line cords will rotate from one plug end to the other. "Pin 1 will go to 8 and 7 to 2 etc. there is a sort of de facto standard for the rj45 (8-pin mod) connector, but for some odd reason at&t reversed it for the sockets on the 3b2... if you want to connect a 3b2 to *anything*, you need a 'half-twist' cable. rs232 to rj45 adaptors generally (always, in my experience) follow the standard; equipment such as the at&t data switch ('datakit') also do. why the arrangement of signals is as it is instead of something rational like gnd dsr rts txd rxd cts dtr gnd i don't know. they could have made the question of null modems moot. -- Andrew Hay +------------------------------------------------------+ Ragged Individualist | But I thought we were *ALL* iconoclasts! | AT&T-BL Ward Hill MA | I was just trying to fit in!!! | a.d.hay@att.com +------------------------------------------------------+