well, I use tsip104
connect everything and when the tsip104 starts type "?"
you will see a menu with lotsa commands

what I do is that:

- first press SHIFT & "U" (that is port configure function)
select operation SET
the set baudrate, data bits, parity, stop bits
now set the protocol in to TSIP and
protocol out to NMEA
set receiver serial port

- second press "q" (that is NMEA OUTPUT CONTROL)
select operation set
select time interval
select whatever sentences you need (you will be surprised but initially all of them are set to off)

this way works for me even after powering off.

do u have a battery conected for backup ?