The TR is a line on the port. I'm not good at
serial port programming, the following is from
reading Bob Puff's documentation on the BB from
his website (I'm sure you know where it is.)
If you enter the following from BASIC, it should
turn the TR light on. If so, then the software you're
using, and/or the settings on the BB aren't set
right or something.
10 CLOSE #1
20 OPEN #1,13,0,"R:":REM THE BB AUTOMATICALLY LOADS THE R: HANDLER ON RESET
AND AT BOOT TIME.
30 XIO 40,#1,0,0,"R:":REM SET CONCURRENT
40 XIO 36,#1,15,0,"R:":REM SET TO 19200 BAUD
50 XIO 34,#1,192,0,"R:":TURN TR LINE ON
60 GOTO 60:REM BE SURE TO CLOSE #1 AFTER YOU BREAK OUT OF THIS
There's something going on with the modem. Try a 2400 baud modem and see
that it works, this'll eliminate that you have a problem with the BB port or
There's a simple BASIC program after the above to
allow getting and putting characters to the modem, ie. you could type AT
commands from it. It gets a STATUS and if there's a char in the buffer, you
can GET it.