Rockwell Automation 1771-DB Basic Module User Manual - Series A - Manual (Page 161)

Error Messages and Anomalies
Chapter 9
9–9
9. If you use a VT100 terminal, the BASIC Module can miss an XON
character sent by your terminal when you enable software handshaking
and use a 19.2K baud rate on the module’s program port. You must type
CTRL Q to resume.
10. If you use a CTRL C to abort LIST# or PRINT# to a peripheral device,
the BASIC Module no longer transmits on the program port (only at 9600
or 19.2 K baud). You can correct the problem by deleting any line. The
line deleted need not actually exist in the program.
11. Illegal CALL numbers above 128 are not trapped and cause the micro to
jump into code memory at the address specified. This can cause the
module to get “lost”.
12. The BASIC Module does not save the EPROM stored baud rate.
Example:
The module is powered up after a CALL 73 is issued and a valid baud
rate is previously stored in EPROM using a PROG1.
If the module is powered down and then up, it is powered up at 1200
baud.
13. The renumber routine does not renumber a program if there is insufficient
RAM left or if a GOTO or GOSUB exists and the target line number does
not. Error reporting does not indicate the cause, only that an error
occurred. We recommend renumbering the program in sections and not
to renumber a program greater than 9 K.
14. When editing a line, an excessive line length may cause the terminal to
issue a CTRL S. A CTRL Q causes termination of the edit. You must
retype the complete line.
15. The BASIC Module updates the wall clock for Daylight Savings Time.
This occurs on the last Sunday in April and October if the Day of Week
is set properly (CALL 42).
9.4
Anomalies (continued)