Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!burl!ulysses!gamma!epsilon!zeta!sabre!petrus!bellcore!decvax!ittatc!dcdwest!sdcsvax!sdcc6!mplvax!cdl From: cdl@mplvax.ARPA (Carl Lowenstein) Newsgroups: net.micro.att Subject: Re: 3B2 cable definition request Message-ID: <270@mplvax.ARPA> Date: Thu, 27-Mar-86 10:45:11 EST Article-I.D.: mplvax.270 Posted: Thu Mar 27 10:45:11 1986 Date-Received: Sat, 29-Mar-86 06:15:50 EST References: <152@hvrford.UUCP> Reply-To: cdl@mplvax.UUCP (Carl Lowenstein) Organization: Marine Physical Laboratory, UCSD Lines: 66 Keywords: 3B2, serial port In article <152@hvrford.UUCP> k_lim@hvrford.UUCP writes: > >Does anyone know the pinouts for the 8-pin modular plugs used for the serial >ports on a 3B2? We have been unable to track this down anywhere in the >documentation. > --------------------------- I think it's in the manual that comes with the (4 serial + 1 parallel) ports card. In any case, here is an old news clipping. --------------------------- >From: rubin@mtuxn.UUCP (M.RUBIN) Subject: Actual pinouts of 3B2's 8-pin RS232 connectors Message-ID: <635@mtuxn.UUCP> Date: 5 Sep 85 19:40:43 GMT Organization: AT&T Information Systems, Holmdel NJ These are the ACTUAL pinouts of the 3B2's strange 8-pin modular RS232 connector, and all the known flavors of TRW modular-to-DB25 adapter (part number 232-21-25-xxx) for the 3B2, determined by inspection. It seems they did quite a bit of hacking to disguise the lack of a DSR pin. Note that the modular-modular CABLES supplied with the 3B2 are crossed over (1->8, 2->7, etc.) and the tables below assume the use of such a cable. Also note the adapter pinout list in the Appendix of the 3B2 Owner/Operator's manual is WRONG!! Yes, the male and female "Terminal/Printer" connectors are DIFFERENT. DB25 PINOUTS (see below for abbreviations) #010 #006 #008 #005 3B2 3B2 Male Female Male Male MODULAR receives sends Term./ Term./ Remote/ ACU/ PINOUTS Printer Printer Console Modem -------- -------- -------- ----- ----- ----- ----- 1 "Prot.Grd." 1 FG 1 FG 1 FG 1 FG 2 "Reserved"(CTS) <-- 4 RTS 4 RTS 5 CTS 5 CTS 3 "TXDO" <-- 3 RxD 3 RxD 2 TxD 2 TxD 4 "DTRO" <-- 8 DCD 8 DCD 6 DSR, 20 DTR 20 DTR | 5 "RXDO" --> 2 TxD 2 TxD 3 RxD | 3 RxD | 6 "DCDO" --> 6 DSR, 6 DSR 6 DSR,| 8 DCD 20 DTR 20 DTR 7 "Signal Grd." 7 SG 7 SG 7 SG 7 SG 8 "Reserved"(RTS) --> 5 CTS 5 CTS 4 RTS 4 RTS --------------------------------------------------------------------- DB25 RS-232-C "Standard" :-) PIN ABBR. NAME DIRECTION ---- ---- ---- -------------- 1 FG Frame Ground -- 2 TxD Transmit Data to DCE 3 RxD Receive Data to DTE 4 RTS Request to Send to DCE 5 CTS Clear to Send to DTE 6 DSR Data Set Ready to DTE 7 SG Signal Ground -- 8 DCD Carrier Detect to DTE 20 DTR Data Terminal Ready to DCE -- carl lowenstein marine physical lab u.c. san diego {ihnp4|decvax|akgua|dcdwest|ucbvax} !sdcsvax!mplvax!cdl