From: Petr Kolar <Petr.Kolar@VSLIB.CZ>
Subject: Re: Seriovy port
Date: Wed, 30 Aug 1995 10:55:26 GMT
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In article <9508281151.aa09814@perun.valm.sk> rengevic%PERUN.VALM.SK@earn.cvut.cz (Vladimir Rengevic) writes: >Mam k PC pripojenu malu skrinku na seriovy port. 25 pin konektor: >1-7-GND >2 tx data >3 rx data >4-5 >6-8-20 >podla popisu je to nulovy modem. Zkuste tohle zapojeni: 2 ----- 3 3 ----- 2 7 ----- 7 4+5 ----- 8 8 ----- 4+5 20 ----- 6+22 6+22----- 20 24+15---- 17 17 ----- 24+15 (ty posledni dva spoje asi u PC pro asynchronni prenos nemaji vyznam). Melo by to fungovat tak, ze v okamziku, kdy pocitac da signal DTR=vyvod 20 (snad pri open()), jeho partner obdrzi jak DSR (6), tak RING (22), coz by ho melo probrat. A pokud posle signal RTS (vyvod 4) dostane sam CTS (vyvod 5, povoleni k vysilani) a druha strana dostane DCD (8) - oznameni o tom, ze prichazi data. Pokud to nepujde, zkuste propojit jenom 20 ---- 6 a pak 20 ---- 22. Zkuste omerit vyvody, co se deje pri open(), a mate-li nejake zarizeni, se kterym ten pocitac funguje, i co se deje pri jejich komunikaci.
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