AMX Mini-LCD Transmitter TX-MLCD - Manual (Page 10)

6 AXCESS Programming TX-MLCD Mini-LCD Transmitter
Programming Restrictions
AXCESS program restrictions include:
1. DEFINE_LATCHING, DEFINE_MUTUALLY_EXCLUSIVE, and
DEFINE_TOGGLING are not supported.
Similar functions are
accomplished with combinations of ON, OFF, and IF… ELSE.
2. PULSE is not supported. A similar function is accomplished with
combinations of ON, WAIT, and OFF
3. String support is limited:
• No access to individual array elements
• No string comparisons
• Some string functions are not supported (e.g., LEFT_STRING, and so
on.)
• Maximum string length is 36 characters.
4. Concurrent WAITS— 5 maximum.
5. Concurrent TOs— 5 maximum.
6. Nesting of levels— 3 maximum. With more than three, an internal
stack overflow may occur resulting in erratic, undefined behavior.
7. Total memory size— 4.5Kbytes. SOURCE–SEND will often need to be
turned OFF resulting in the inability to RETRIEVE a program from
the TX–MLCD. There may not be enough memory in the TX–MLCD
to include the program source code and the compiled (executable)
program.
Programming Basics
The following information is helpful when programming the TX–MLCD:
• TX–MLCD is assigned device code number one. To use channel and
SEND_STRING commands for sending text to the LCD screen:
DEFINE_DEVICE
MLCD=1
• Use device code number zero to return characters from the TX–
MLCD RS–232 port. Returning characters from TX–MLCD can be
useful for debugging.