[GreenKeys] Need PC to TTY Loop Keyer ASAP fast

[teletype at buzbee.net]

And if you find you need some last-minute HeavyMetal tweaking, give me a
call.  My cellphone number is 650-888-7201.  I'd recommend using the latest
version:

http://www.buzbee.net/heavymetal/hm_1_21.zip

...Bill Buzbee

> -----Original Message-----
> From: gil smith [mailto:gil at baudot.net] 
> Sent: Tuesday, October 04, 2005 3:14 PM
> To: Sellam Ismail; John Lawson
> Cc: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] Need PC to TTY Loop Keyer ASAP fast
> 
> 
> Hi Sellam and John:
> 
> OK, presuming your M32 uses a powered loop, up to 120VDC, at 
> 20-mA, you 
> should be able to use the TTY232-TAP gizmo I am sending you.  
> It plugs into 
> the DB9-M serial port on a PC, and has about 10 feet of lamp cord for 
> connecting to your M32 TTY loop in half-duplex mode.  Loop 
> polarity does 
> not matter.  If you need it to handle 60-mA, you will need to 
> open it up 
> and solder a connection (contact me for info).
> 
> Requirements on your serial port:  The TAP unit derives 
> switching power 
> from the serial port.  It is happiest when RTS and DTR are driven to 
> opposite levels.  I don't know whether HeavyMetal has a way 
> to force these 
> lines to active (positive) and inactive (negative) levels, 
> but I just tried 
> the HM version I have on an old win98 machine, and it worked 
> just fine with 
> this TAP unit.
> 
> Further requirements on your serial port:  I would use a 
> desktop machine, 
> so HM can drive the serial port in 5-bit mode.  I predict a 
> laptop and 
> USB-serial adapter will cause you grief.
> 
> The TAP will be there tomorrow morning -- fedex track # 
> 7901-7597-8320.
> 
> have fun,
> 
> gil
> 
> 
> 
> 
> 
> Vaux Electronics, Inc.
> 480-354-5556
> (fax: 480-354-5558)
> www.vauxelectronics.com
> 
> 
> 
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