Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!columbia!chris From: chris@columbia.UUCP (Chris Maio) Newsgroups: comp.sys.hp Subject: Re: Series 300 RS-232 pinout? Message-ID: <4221@columbia.UUCP> Date: Wed, 14-Jan-87 19:33:25 EST Article-I.D.: columbia.4221 Posted: Wed Jan 14 19:33:25 1987 Date-Received: Thu, 15-Jan-87 04:08:36 EST References: <1014@zog.cs.cmu.edu> Reply-To: chris@columbia.edu (Chris Maio) Distribution: na Organization: Columbia University CS Department Lines: 25 Keywords: RS-232 pinout In article <1014@zog.cs.cmu.edu> tgl@zog.cs.cmu.edu (Tom Lane) writes: >Anyone know the pinout of the 9-pin RS-232 connector found on >HP 9000 Series 300 machines? The manuals are unhelpful... My Configuration Reference Manual says that the pinouts are as follows: DB9 DB25 DTR 1 20 TXD 2 2 RXD 3 3 RTS 4 4 CTS 5 5 DSR 6 6 not implemented GND 7 7 signal ground CD 8 8 RI 9 9 I haven't used it, but if I'm reading the manual right, the interface "looks" like a DTE, so if you're making DB9->DB25 cables, use male DB25 connectors. If you're hooking up a modem, you may need to flip a switch on the card to enable modem control. This interface has only a one-byte buffer and no on-board support for modem handshaking or flow-control, and input at rates above 2400 baud (or above 300 baud concurrent with disk accesses on the builtin hp-ib interface) may result in loss of data. Chris