[WT-support] Parallel-Port question WT & TS 850

[Patrick 9A5CW]

Hi WT users...
read this:

In addition to the data pins the parallel port has four other output pins.
Those are handshake pins STROBE (pin 1), AF (pin 14), RESET (pin 16) and
SELECT (pint 17). Those outputs give TTL level signals, but are constructed
electrically differently and controlled with a different control register.

The control outputs are generally constructed as open collector output with
internal pull-up resistor.

         +5
         |
       4.7 kohm
         |
         |________  TTL output
         |   out
        /
    ---L off
        \
         |
        Gnd

This kind of ouputs can't source much of anything (about 1 mA through the
4.7K resistors to +5), and can only sink about 7mA. This kind of output can
control TTL inputs fine, and might be able to run an optocoupler or solid
state relay in sink mode (depends on the device).
....

Try lower the input resistor from 1k to 670ohm... maybe you can see the
difference... IF you can open the LCU LPT box.

73


2008/11/10 Rick Dougherty NQ4I <nq4i at contesting.com>

> Hi Lenz...I have the same type of problem here at NQ4I M-M...some printer
> ports have a floating ground and some do not...I think if you check you will
> find a difference..de Rick NQ4I
>
>
> On Sun, Nov 9, 2008 at 7:17 PM, Lorenz Grassl <lenz at lenz-grassl.de> wrote:
>
>> Hello group from Landshut!
>>
>> I´m searching for any solution for this problem:
>>
>> I run two computers - one desktop-computer quite old and the one laptop,
>> quite new (2 years old)
>> Both run on XP home (SP3) with real parallel-ports and port95nt installed.
>>
>> My radio, a TS850, is hooked up with a serial adaptor to control the
>> radio and a parallel adaptor (LCU-KEY) to key PTT and CW.
>>
>> So far. Now the problem when I hit any macro like F2 (5nn):
>>
>> When using the old desktop-machine:
>> - everything works fine. VOX is turned either to "manual" or "VOX" and
>> the keying works perfect.
>>
>> When using the laptop:
>> - with the VOX-switch set to "manual" WT keys the PTT (ON AIR is lit)
>> but no HF is transmitted. The display still shows "S" instead of "PWR"
>> while I can hear the sidetone from the TS850.
>>
>> - with the VOX-switch set to "VOX" PTT is keyed, Display still shows "S"
>> instead of "PWR"
>> - after the TX-delay the sidetone comes up and the display shows "PWR",
>> HF is transmitted.
>>
>> Obviously there is some difference between both printer ports but
>> WHICH...?
>> I can´t explain the difference myself. Maybe anybody can?
>>
>> I checked the parallel-port modes in windows, both are in ECP-Mode.
>>
>> Thanks for any help!
>>
>> Lenz,
>> DL8RDL
>> _______________________________________________
>> Support mailing list
>> Support at win-test.com
>> http://www.f5mzn.org/cgi-bin/mailman/listinfo/support
>>
>
>
> _______________________________________________
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>
>


-- 
9A5CW - Patrik Hrvatin
--... ...--
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