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Groups > comp.sys.apple2.programmer > #3134

Re: Puzzling the SSC Block

From ultramagnus_tcv <mikew@thecomputervalet.com>
Newsgroups comp.sys.apple2.programmer
Subject Re: Puzzling the SSC Block
Date 2016-10-16 08:47 -0500
Organization A noiseless patient Spider
Message-ID <nu00cu$gu2$1@dont-email.me> (permalink)
References (3 earlier) <x5idnX0qc5ozS2bKnZ2dnUU7-adQAAAA@giganews.com> <ntjtuf$k8f$1@dont-email.me> <c0f1cbdf-acaa-4150-998f-f494acdcaffc@googlegroups.com> <ntlhr8$23v$1@dont-email.me> <e703f1c1-09a2-44b0-a84a-9ba2a882e149@googlegroups.com>

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On 2016-10-13 03:37:48 +0000, roger.shimada@gmail.com said:

> A voltmeter will read a negative voltage on TX if the device is wired 
> as a DTE. Zero means that it's an input not output, so measure RD for a 
> voltage. A negative voltage on RD means the device is wired as a DCE.

Actually, this message comes to me at a good time. I was just trying to 
puzzle out what my RS232 Mini-Tester is telling me with its 
multicolored LEDs (RED/GREEN).

Last night, I tried to do some multimeter probing. My SSC is in 
Terminal mode and I measured the far end of a straight-through cable. 
My ground was on Signal Ground. I don't have a 25-pin breakout board so 
I was using a 9-pin breakout.

Pin 1 (CD) is green and +9 Pin 2 (RD) is red and is -9.

I've read that -3 to -25 is OFF (1) and +3 to +25 is ON (0), then I 
think that green is high and red is low.

Thanks!!!

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Thread

Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-09 10:39 -0500
  Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-09 11:46 -0500
  Re: Puzzling the SSC Block roger.shimada@gmail.com - 2016-10-09 21:18 -0700
    Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-10 08:16 -0500
      Re: Puzzling the SSC Block Michael J. Mahon <mjmahon@aol.com> - 2016-10-10 12:58 -0500
        Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-11 18:52 -0500
          Re: Puzzling the SSC Block roger.shimada@gmail.com - 2016-10-11 17:47 -0700
            Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-12 09:36 -0500
              Re: Puzzling the SSC Block David Schmenk <dschmenk@gmail.com> - 2016-10-12 09:00 -0700
            Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-12 09:37 -0500
              Re: Puzzling the SSC Block roger.shimada@gmail.com - 2016-10-12 20:37 -0700
                Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-13 21:01 -0500
                Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-16 08:47 -0500
          Re: Puzzling the SSC Block David Schmidt <schmidtd@my-deja.com> - 2016-10-11 21:27 -0400
            Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-12 09:31 -0500
              Re: Puzzling the SSC Block David Schmidt <schmidtd@my-deja.com> - 2016-10-12 11:27 -0400
          Re: Puzzling the SSC Block Michael J. Mahon <mjmahon@aol.com> - 2016-10-12 01:18 -0500
            Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-12 09:39 -0500
    Re: Puzzling the SSC Block ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-10-10 08:26 -0500

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