Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Phil Hobbs Newsgroups: sci.electronics.design Subject: Re: GPIB bus topology Date: Wed, 1 May 2024 22:34:23 -0000 (UTC) Organization: A noiseless patient Spider Lines: 32 Message-ID: References: <6632ba30$0$8096$882e4bbb@reader.netnews.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Thu, 02 May 2024 00:34:23 +0200 (CEST) Injection-Info: dont-email.me; posting-host="db9f13545c55ae2658e2b8e0bca8d63e"; logging-data="3596506"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/1iIbSRMwiPBpHVBPDADxs" User-Agent: NewsTap/5.5 (iPhone/iPod Touch) Cancel-Lock: sha1:Ao49ilCD7H0Z+uVnzMngwptWI1Q= sha1:iMQVwDds0U5g2faxALXwyB8lxsM= Bytes: 2193 piglet wrote: > bitrex wrote: >> I have several pieces of HP gear (DMM, counter, Agilent-branded >> triple-output supply) I'd like to connect to a National Instruments USB >> to GPIB adapter for some measurements. >> >> IEEE 488 is somewhat before my time and I see that the connectors are >> stackable, is there a preferred bus topology for a few pieces of gear? >> Star, linear/daisy chain with the stack on the interface, linear/daisy >> chain with the stack on the first piece of gear? Does it matter much in >> this use case? >> > > Daisy chain, no more than two connectors per unit as the accumulated weight > gets problematic. > Not to mention the torque, when someone tugs on a cable. I believe that folks have been known to do a star connection, with the center node being just cables, for that reason. The interface speed is less than 1 MHz, even when externally clocked, so it’s all the same electrically. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics