Yo, Tracy did you get the schematic?


Paul Lamar

Tracy Crook wrote:

Yes.  Looks OK but no tristate control logic shown.

Tracy

I am going to use the Request To Send line out of the 
PC UART COM RS232 port.

One can control the bit directly in DOS using QB code.
There was a book written in 1986 called Mastering Serial 
Communications by Peter W. Gofton. Sybex ISBN 0-89588-180-2
Lots of QB code snippets on direct control of PC UARTS.
Bit 1 controls the RTS line in the Modem Control Register.
RTS is not used by either the GPS or the DGH Modules.
For COM1 it is at address H3FC. For COM2 it is at H2FC.

To set RTS leaving all other lines the same:

MCRBitPattern = INP(&H3FC)
MCRBitPattern = MCRBitPattern OR 2
OUT(&H3FC, MCRBitPattern)

To set to zero:
MCRBitPattern = INP(&H3FC)
MCRBitPattern = MCRBitPattern AND (NOT 2)
OUT(&H3FC, MCRBitPattern)

This must be done after OPEN COM(x) initialization.

Like all programming I need to fool with it for a bit :-)

BTW still getting a lot of bounces. Are you stuck with your ISP ?

Paul Lamar
 
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