kf4lvz at yahoo.com
Thu Jan 16 00:41:56 CST 2014
On 1/15/2014 19:18, Stephen H. Smith wrote:
> On 1/15/2014 9:24 PM, Kent Hufford wrote:
>> GREEN Light LABS D710 GPS sticks on the back of a D710 control head.
>> Buy at HRO.
>> or GARMIN 18PC serial output puck
>> or new KENWOOD D710G with builtin GPS
> Today, nearly ALL small faceless "puck" type GPS units, and consumer
> display-type GPS units now have USB interfaces rather than serial.
Almost true. If you're willing to pop one open (and, for some, build a
tiny one-transistor circuit) then any of the USB pucks can be used
because they all internally use USB-to-serial adapter chips (Prolific,
FTDI, etc.). Cracking one open will provide access to the true serial
data on the other side of the adapter chip. Bring those signals out
(and power) and you have a serial puck.
The one-transistor circuit is to handle a low voltage or inverted drive
if the adapter chip is TTL instead of RS232 on the far end.
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