[GreenKeys] Serial Settings

[Ken Wiebe]

Thanks, that info helps. Regarding parity vs. non-parity:

My understanding is the non-parity keyboard is simpler in that the 8th level pulse is always marking. This is easy to observe in operation. So some characters have an even number of marking pulses and some have an odd number.

Looking at the LH side of the keyboard under the cover there is what's called an 'auxiliary contact mechanism' the parity keyboard has, that the non-parity keyboard lacks. That mechanism is the source of the parity keyboard's ability to change the 8th level into marking or spacing dependent on the key pressed. So for the parity keyboard, that mechanism ensures there is an even number of marking pulses for every character - regardless of the character pressed.

Ken

On Thu, Aug 8, 2019, at 12:25, Rob Jarratt wrote:
> I don’t know the details of my keyboard (how to tell it is parity or not), but I used 7E2 successfully to connect from a simulated DECSYSTEM-20 via a DECserver 90M in reverse telnet configuration and a Westermo MA-21. The port on the DECserver 90M is set to 7E2. Not sure if that helps.

> 

> Regards

> 

> Rob

> 

> *From:* greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> *On Behalf Of *Ken Wiebe
> *Sent:* 08 August 2019 18:13
> *To:* Thomas Tillson via GreenKeys <greenkeys at mailman.qth.net>
> *Subject:* [GreenKeys] Serial Settings

> 

> Hi Greenkeys,

> 

> I have a 33 set up to communicate over RS-232 serial. I've read online some conflicting info regarding serial settings.

> 

> Does it boil down to parity vs. non-parity keyboard?

> 

> So parity keyboard would be 7E2 and non-parity 8N2? (my keyboard is non-parity)

> 

> I'm having some issues with CR/LF too, but I'm not sure what to expect regarding the interaction between the 33 and the terminal program I'm using.

> 

> Any tips, anecdotes from Greenkeyers who have explored this appreciated.

> 

> Ken

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