Syntax error, missing symbol in Basic - syntax-error

Question

Hi every time I try to run the following program:
L=-1
OPEN "tty.usbserial-FTG7QLFS:300,N,8,1,CS0,DS" FOR OUTPUT AS #1
WHILE L
J=63
MENU: PRINT
PRINT
PRINT
PRINT
PRINT
PRINT
PRINT "WAITING FOR KEYSTROKE COMMAND"
PRINT "TYPE:"
PRINT " C-CLOSE SHUTTER"
PRINT " O-OPEN SHUTTER"
PRINT " R-RESET CONTROL"
PRINT " Q-TERMINATE PROGRAM"
PRINT
PRINT
START:
A$ = INKEY$
IF A$ = "O" THEN
PRINT #1,CHR$(J+1);
PRINT "SHUTTER OPEN COMMAND SENT"
GOSUB TIMEOUT
GOTO MENU
ELSEIF A$ = "C" THEN
PRINT #1,CHR$(J+2);
PRINT "SHUTTER CLOSE COMMAND SENT"
GOSUB TIMEOUT
GOTO MENU
ELSEIF A$ = "R" THE
PRINT #1,CHR$(J+3);
PRINT "CONTROL RESET COMMAND SENT"
GOSUB TIMEOUT
GOTO MENU
ELSEIF A$ = "Q" THEN
L = 0
PRINT "PROGRAM TERMINATED"
ELSE GOTO START
END IF
WEND
END
TIMEOUT: FOR I=1 TO 100:NEXT I
CLS 0
RETURN
I get the following error "syntax error, missing symbol in line 6", but at line 6 there is only a print statement so I can't figure out what I'm missing. I'm running the program through Chipmunk Basic on Mac OS X.
Thanks

Answer 1

I guess
OPEN "tty.usbserial-FTG7QLFS:300,N,8,1,CS0,DS" AS#1
is missing a file access mode. Maybe the compiler is looking for such tokens without success and gives up in the next lines.
The Chipmunk BASIC docs say:
open STRINGEXPR for { input|output|append } as # FNUM
-- or --
open STRINGEXPR for random as # FNUM len = VAL
See http://anoved.net/cbasdox/statements.html#open
I don't really know Chipmunk BASIC but also in other BASIC dialects (QBasic, FreeBASIC, VisualBASIC Classic, ...) you have to state for what actions you want to open your file.
Examples FreeBASIC:
OPEN SomeFile FOR INPUT AS #1 ' input (read-only)
OPEN OtherFile FOR OUTPUT AS #2 ' write (replace existing file)
OPEN FooFile FOR BINARY AS #3 ' binary (read + write)
It's like specifying "r", "r+", ... when using fopen in C-ish languages.