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Article #160Re: q:RS232 on a CBM64
From: Jerzy Tarasiuk
Date: Sat, 18 Mar 1995 11:24
Date: Sat, 18 Mar 1995 11:24
11 lines
2064 bytes
2064 bytes
>>>>> "R" == Rob Janssen <rob@pe1chl.ampr.org> writes: R> They not only invert, but also convert between TTL levels and the RS232 R> standard, which specifies positive and negative voltages to be used. R> Using only an inverter will result in marginal levels, it may work or R> may not work. Right, but I have seen serial mouse which converted voltage received from RS-232 to +5V (+12 by truncating, -12 by generator+rectifier), and worked with PC - seems PC's RS-232 recognizes TTL levels on input. Note the +/-12V on outputs can cause damage of TTL inputs.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10d683,efeb94067a7f2c8a X-Google-Attributes: gid10d683,public X-Google-Thread: f53ba,efeb94067a7f2c8a X-Google-Attributes: gidf53ba,public X-Google-Thread: f70d1,efeb94067a7f2c8a X-Google-Attributes: gidf70d1,public X-Google-Thread: 102bfa,efeb94067a7f2c8a X-Google-Attributes: gid102bfa,public X-Google-Thread: 10265e,efeb94067a7f2c8a X-Google-Attributes: gid10265e,public X-Google-Thread: 105ed0,efeb94067a7f2c8a X-Google-Attributes: gid105ed0,public X-Google-Thread: 103cf4,efeb94067a7f2c8a X-Google-Attributes: gid103cf4,public X-Google-ArrivalTime: 1995-03-18 03:33:58 PST Newsgroups: comp.sys.ibm.pc.hardware.comm,alt.comp.hardware.homebuilt,alt.msdos.programmer,aus.computers.ibm-pc,comp.ibm.pc.hardware,comp.ibm.pc.misc,comp.sys.ibm.pc.misc Path: arc1-ca.pugleaf.net!bga.com!news.sprintlink.net!pipex!oleane!jussieu.fr!univ-lyon1.fr!swidir.switch.ch!newsfeed.ACO.net!fuw.edu.pl!news!jt From: jt@fuw.edu.pl (Jerzy Tarasiuk) Subject: Re: q:RS232 on a CBM64 In-Reply-To: rob@pe1chl.ampr.org's message of Thu, 16 Mar 1995 11:59:20 GMT Message-ID: <JT.95Mar18122453@albert5.fuw.edu.pl> Sender: news@fuw.edu.pl Nntp-Posting-Host: albert5 Reply-To: jt@zfja-gate.fuw.edu.pl (Jerzy Tarasiuk) Organization: Warsaw University, Physics Department References: <3k1ckr$si4@news.iesd.auc.dk> <3k5ntv$m6p@styx.uwa.edu.au> <3k6mn2$c0@chris.telip.uni-sb.de> <D5J7yy.1o7@pe1chl.ampr.org> Date: Sat, 18 Mar 1995 11:24:53 GMT Lines: 11