Microvax connecting from console (MMJ) to DB25(female) DCE port

--- On Wed, 6/13/12, TeoZ <teoz at neo.rr.com> wrote: Adapters to go from DB25 to "RJ45" [1] connectors are very, very common - however there is no standard pinout for RS232 on RJ45. When you get such adapters new, they are sold as kits - the RJ45 jack has wires coming from it, crimped onto pins that are left loose. You are required to plug the pins into the DB25 in the required configuration. As such, when you find used adapters, they're likely to be in any possible configuration - you'll have to pop them apart and see how they're wired, and rewire where necessary. On the subject of MMJ - they are physically the same size as a 6p6c modular plug, so you can easily file the clip off such a plug and use it in an MMJ jack - it won't secure in, of course, but it'll work. Not that MMJ's stay in particularly well as it is - that stupid offset clip means that the connector sits in at an angle sometimes, and then occasionally makes poor contact. The only real MMJ cable I have has issues plugging into my MicroVax 3900's console port - which is slightly damaged from corrosion from the battery. It'll randomly stop working, and you have to remove and reinsert it. The filed-down 6p6c plug doesn't have this problem. DEC had lots of great ideas. MMJ was most definitely not one of them. Heh. -Ian [1] Yes, I know that "RJ45" refers to a specific wiring of a particular Registered Jack, not the 8p8c connector itself. But the tech industry has standardized on referring to 8p8c modular plugs and jacks as RJ45 - regardless of the term's initial meaning. This is similar to referring to 9 pin DSUB connectors as DB9 - despite the shell size not being B, it's E - the correct name is DE9. But the majority of the industry calls that connector a DB9. "Common usage" and "exact, correct, technical term" aren't always the same thing.