Received: from PCH.mit.edu (18.7.21.50) by mail.efplus.com (192.168.0.8) with Microsoft SMTP Server (TLS) id 8.3.485.1; Thu, 1 Oct 2020 17:10:03 -0700 Received: from PCH.MIT.EDU (localhost.localdomain [127.0.0.1]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 091Nx67r021994; Thu, 1 Oct 2020 19:59:27 -0400 Received: from outgoing-exchange-3.mit.edu (OUTGOING-EXCHANGE-3.MIT.EDU [18.9.28.13]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 091Nx5Dv021991 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Thu, 1 Oct 2020 19:59:05 -0400 Received: from w92exedge3.exchange.mit.edu (W92EXEDGE3.EXCHANGE.MIT.EDU [18.7.73.15]) by outgoing-exchange-3.mit.edu (8.14.7/8.12.4) with ESMTP id 091NwwiJ015177 for ; Thu, 1 Oct 2020 19:59:04 -0400 Received: from w92expo17.exchange.mit.edu (18.7.74.71) by w92exedge3.exchange.mit.edu (18.7.73.15) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Thu, 1 Oct 2020 19:58:23 -0400 Received: from oc11exhyb4.exchange.mit.edu (18.9.1.100) by w92expo17.exchange.mit.edu (18.7.74.71) with Microsoft SMTP Server (TLS) id 15.0.1365.1; Thu, 1 Oct 2020 19:59:03 -0400 Received: from NAM12-DM6-obe.outbound.protection.outlook.com (104.47.59.169) by oc11exhyb4.exchange.mit.edu (18.9.1.100) with Microsoft SMTP Server (TLS) id 15.0.1395.4 via Frontend Transport; Thu, 1 Oct 2020 19:59:03 -0400 Received: from MWHPR2201CA0041.namprd22.prod.outlook.com (2603:10b6:301:16::15) by BYAPR01MB5223.prod.exchangelabs.com (2603:10b6:a03:89::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3433.38; Thu, 1 Oct 2020 23:59:01 +0000 Received: from CO1NAM03FT056.eop-NAM03.prod.protection.outlook.com (2603:10b6:301:16:cafe::51) by MWHPR2201CA0041.outlook.office365.com (2603:10b6:301:16::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3433.34 via Frontend Transport; Thu, 1 Oct 2020 23:59:01 +0000 Received: from premium47-1.web-hosting.com (68.65.123.241) by CO1NAM03FT056.mail.protection.outlook.com (10.152.81.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3433.34 via Frontend Transport; Thu, 1 Oct 2020 23:59:00 +0000 Received: from 107-145-246-199.res.spectrum.com ([107.145.246.199]:59923 helo=[192.168.10.106]) by premium47.web-hosting.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1kO8TP-002L33-I3; Thu, 01 Oct 2020 19:58:59 -0400 From: Neil To: Microcontroller discussion list - Public. Sender: "piclist-bounces@mit.edu" Date: Thu, 1 Oct 2020 16:58:54 -0700 Subject: Re: [EE] RS-485 analyzer/sniffer? Thread-Topic: [EE] RS-485 analyzer/sniffer? Thread-Index: AdaYUGDJzx7WvKIqTzKmlB8f2ff46g== Message-ID: <5F766D3E.9080906@narwani.org> References: <5F7619A5.1030407@narwani.org> <5F762F17.2080803@narwani.org> List-Help: List-Subscribe: , List-Unsubscribe: , In-Reply-To: Reply-To: Microcontroller discussion list - Public. Accept-Language: en-US X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-AuthSource: TS500.efplus4.local X-MS-Has-Attach: X-Auto-Response-Suppress: All X-MS-Exchange-Organization-SenderIdResult: Pass X-MS-Exchange-Organization-PRD: mit.edu X-MS-TNEF-Correlator: received-spf: None (protection.outlook.com: narwani.org does not designate permitted sender hosts) dkim-signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=narwani.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:Reply-To:To:References:Subject:Sender:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=wauvU6nr90CB/I8qJ4WV/oUULSmEOJiSjWS97h09utE=; b=bXnsd/hOnZMnEtkpXZAj3f2nJD cQ+PqSadl16OAmoLXrAnNYWcVcBPf9dLDaq5VbUdRFIaAhgYd+nhZT/Yv4aeRb6AXeiPQfh3CQAf2 NrzLZRlakFk3YP2VS3/TOGI63G81S+m6EdaVAsxOGBuKgWQl32WJJdl2cNlTgD3FnM4GdRxFPJ7IO mGHTX/6AL1sPZz2TAeJL5HAMATF7za1v/EhXEIn7yP+JC0KMqXBpl7fNB+jWJ7mhKwK6yOIf0HvcA yQFsCMYdmiSUJ9eVJcoxe3UrVszZFifolG3ifTSeWbuJGkl+CpzKLf9b5BuZlCNVOOhFUW0Q8to2Y uViBqHEg==; authentication-results: spf=none (sender IP is 68.65.123.241) smtp.mailfrom=narwani.org; mit.edu; dkim=pass (signature was verified) header.d=narwani.org;mit.edu; dmarc=bestguesspass action=none header.from=narwani.org; user-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 errors-to: piclist-bounces@mit.edu list-id: "Microcontroller discussion list - Public." list-post: x-beenthere: piclist@mit.edu x-mailman-version: 2.1.6 x-source-args: x-source-dir: x-antiabuse: Sender Address Domain - narwani.org x-source: x-authenticated-sender: premium47.web-hosting.com: ca4@narwani.org x-topics: [EE] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Good point on the single-wire voltage. On 10/1/2020 4:03 PM, Harold Hallikainen wrote: > I've used a logic analyzer like the thech-tools DigiView to watch a 485 > bus directly. No 485 receiver required since one wire or the other is 5V > serial data. Also, RealTerm can capture serial data and display it in hex= .. > I use an FTDI TTL-232R-5V-WE cable to get TTL or similar level data into = a > USB comm port. > > Harold > > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .