[GreenKeys] Need PC to TTY Loop Keyer ASAP fast

[gil smith]

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