For older style RadioTrack cards only.
This function checks if the old-style RadioTrack card is tuned to a station. It can be used to check for a valid station when doing station scans. The format of the function is:
return_data = RT1Tuned( rt_address, delay1, delay2 )
The rt_address is the decimal value of the card's I/O location 780 (30C hex) or 524 (20C hex).
The delay1 and delay2 deal with getting the tuned status from the radio card. Depending on your system and/or programming language used, these values may be variable. Use delay1 = 150 and delay2 = 100 to try for starters. The units of the delays are in milliseconds and they may not be less than 1 or greater than 1000. The same rules for these delays apply as the RTDelay function of this library.
return_data returns the following values:
0 No station tuned.
1 Station tuned.
10 TESTCFG.SYS could not be opened.
11 Invalid time delay range.
28 Error reading radio card.