[Ham-Mac] Re: DarwinPSK question

[G7BSK]

Steve,

Thanks for the comprehensive answer, much appreciated, although still 
not got it to work yet HI HI!.

No doubt I will realise my obvious blunder at 3am in the morning!!

Best 73's

Jason, G7BSK

On 3 Oct 2004, at 02:56, Steve Hellyer wrote:

> Hi all:
>
> The default Mac serial ports are RS-422 (using mini-Din 8 connectors 
> in this case). This RS-422 signalling applies similar voltage levels 
> as RS-232 but uses a differential means to determine if voltage was 
> high or low on a pin vs absolute voltage levels as used in RS-232 . 
> The result is ability to use longer cable and/or higher speeds than 
> RS-232.
>
> Pin outs look like this:
>
> 	• 	1 - HSKi Handshake or Clock input
> 	• 	2 - HSKo Hanshake output
> 	• 	3 - TXD- Transmit Data inverted
> 	• 	4 - Signal Common
> 	• 	5 - RXD- Receive Data inverted
> 	• 	6 - TXD+ Transmit Data non-inverted
> 	• 	7 - GPi General Purpose in
> 	• 	8 - RXD+ Receive Data non-inverted
>
> What appears to be a strange set of pins was very handy to Apple as it 
> provided for LocalTalk or PhoneNet networking at 230Kbps.  Anyone 
> remember that? :-)  Hence as you can see these serial ports can go 
> very fast.
> It also eliminated the need for modem and null-modem type cabling 
> between RS-422 devices. 8 pin to 8pin the same cable could be used for 
> a printer (DTE) or modem (DCE).
>
> But there is another bonus for choosing RS-422. It can also perform 
> RS-232 signalling.  Buy connecting Pin 8 to pin 4 to ground it signals 
> to the chipset on the Mac to use RS-232 absolute signalling at 5v.
>
> Here is a great link which provide pinout, cable diagrams as well as 
> much more detail that I have provided here.
>
> http://www.hinton.demon.co.uk/mac/mac_if.html#modem
>
> Hope this helps some!
>
> 73
> Steve
> VA3SPH
>
> On 2-Oct-04, at 4:58 PM, G7BSK wrote:
>
>>>>
>>
>> Thanks Volker, the socket on the keyspan adaptor is 8 pin miniture 
>> DIN type and I am sure that pin 8 is the frame, but thanks for the 
>> advice anyway.
>>
>> BTW is Ver 0.8.4 the latest or has a new version come out.
>>
>> 73's
>> Jason, G7BSK
>>>>
>>> Well, DarwinPSK drives RTS and DTR. These are Pin 4 and 20 with an 24
>>> Pin connector. With an 9 Pin connector I think you can use Pin 8. I
>>> don't know if it's DTR or RTS .
>>>
>>> 73, Volker, DL1KSV
>>>
>>>> Also does anyone know if Ver 0.8.4 is the latest?
>>>> 73's
>>>> Jason
>>>> G7BSK
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