Date: Wed, 8 May 2002 21:52:37 +0400 From: "AMI" <ami@lycos.ru> To: <freebsd-questions@FreeBSD.ORG> Subject: Re: COM port for voltage command/measurement ? Message-ID: <032501c1f6c8$34094780$0100a8c0@p7> References: <3CD93DC7.6C037CA7@is-production.com>
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Hello! I think you may use DTR as command for external relay about +12-3 V. But don't use RTS because it's info wey and haven't true voltage for. It is cheme of the connector: 9 PIN D-SUB MALE at the Computer. Pin Name Dir Description 1 CD <== Carrier Detect 2 RXD <== Receive Data 3 TXD ==> Transmit Data 4 DTR ==> Data Terminal Ready 5 GND === System Ground 6 DSR <== Data Set Ready 7 RTS ==> Request to Send 8 CTS <== Clear to Send 9 RI <== Ring Indicator Note: Direction is DTE (Computer) relative DCE (Modem). Andrew > Hi, > > I did some search on your archives and others, and found no info on that > : > > I need to use a com port to command voltage on com port pins, to be able > to drive external relays. > > Would anybody have any hint/example for that function ? > > Best regards, > -- > > __________ Bernard DUGAS ________________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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