[time-nuts] Mounting GPS Antenna on Steel Roof
GandalfG8 at aol.com
GandalfG8 at aol.com
Sat Mar 8 08:48:23 UTC 2008
In a message dated 08/03/2008 03:57:02 GMT Standard Time,
kirbybq at bellsouth.net writes:
The inverter is required because the Motorola GPS receiver uses TTL and
the PC serial port uses RS232.
RS232 uses a positive voltage of +3 to +25 volts to indicate a logic
zero, and a negative voltage of -3 to -25 volts to indicate a logic one.
-----------
My Motorola Oncore test rig uses a Max232 to interface the RS232, no
inverter, and works fine.
regards
Nigel
GM8PZR
More information about the Time-nuts_lists.febo.com
mailing list