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- Newsgroups: comp.sys.mac.comm
- Path: sparky!uunet!psinntp!panix!oppedahl
- From: oppedahl@panix.com (Carl Oppedahl)
- Subject: Re: Why is DTR on MODEM not working?
- Message-ID: <1992Dec22.063520.1365@panix.com>
- Date: Tue, 22 Dec 1992 06:35:20 GMT
- References: <1992Dec21.215223.14729@brtph560.bnr.ca>
- Organization: PANIX Public Access Unix, NYC
- Lines: 46
-
- In <1992Dec21.215223.14729@brtph560.bnr.ca> Tom Brown <Tom@BNR.CA> writes:
-
- >Having been recently introduced to the world of System7, I am now getting
- >setup
- >with Remote Access and all of the goodies that it brings. I went through
- >major
- >pain however, in trying to get the modems to initialize properly. After
- >messing
- >around with a breakout box I found that DTR was missing TO one of the
- >modems.
- >I reprogrammed the MNPLINK document to initialize the modem to ignore DTR.
-
- >I would still like to know what is going on though. I have 3 Macs, a PLUS
- >with
- >System7 & 4MB and 2 Mac IIci's. THIS PROBLEM ONLY OCCURS ON ONE OF THE
- >IIci's!
- >The PLUS and IIci at work operate correctly, the IIci at home has DTR
- >unlit. When
- >the errant Mac does send data, the DTR LED does flash momentarily.
-
- >The work IIci has APPLETALK, Ethernet, MacIRMA and the modem. The home
- >IIci has
- >the modem, a StyleWriter and an XCeed cache card. I have tried all
- >permutations of
- >modems and cables in each location, no change in LED. The PLUS has 4MB,
- >modem &
- >external disk. (Apple said to reinstall the system & Remote Access but
- >this didn't
- >change anything). (Home Mac is 8-bit color, 14", work is 19"
- >mega-graphics B&W)
-
- >I have also tried different modems with the home Mac always without DTR.
- >(I have
- >used Telebit T2500 & TrailBalzer Plus). (I hope it isn't H/W, the
- >warranty expired
- >last month, wouldn't you know it!).
-
- I think you already ruled out my proposed cause. Perhaps one of the
- modem cables simply lacks the DTR wire? This is pretty common, actually.
- Some modem cables have little more than TX, RX, and ground.
-
-
- Carl Oppedahl AA2KW (intellectual property lawyer)
- 30 Rockefeller Plaza
- New York, NY 10112-0228
- voice 212-408-2578 fax 212-765-2519
-