ees@vax135.UUCP (Gene Sampieri) (02/15/85)
Standard NULL-MODEM The following table gives the connections for the standard NULL-MODEM as sold by most computer supply companies. Use two DB25 connectors and a short piece of cable or some wire. Most are sold with female on both ends but you can customize it for your needs. CONN-A CONN-B -------------- 1 1 2 3 3 2 4,5 8 6,22 20 7 7 8 4,5 20 6,22 22 4,5 This will work with most modems without modification. I use a Hayes 1200 and this. I have also used an ATT made by Penril that neesd pin 20 (DTR) at the modem end tied to 6 (DSR) of the same end. Others I know who use various modems from acoustic couplers to direct connect types use it one of the two ways. Gene Sampieri ATT-Bell Labs ...vax135!ees