11796-8000
June 1999
OPERATION
If you try to press CYCLE START before receiving a program, you will get the message: NO DNC PROG YET.
The reason for not allowing the command of CYCLE START before receiving the DNC program is for safety. If
the operation is allowed to start from a remote location, the operator may not be present to ensure that the
machine is operating safely.
While a DNC program is executing, you are not allowed to change modes. You must first press RESET to stop
the program.
When the end of the DNC program is received, the message DNC END FOUND is displayed. When the DNC
program is finished running, the PROGRAM DISPLAY will show the last few lines of the program. You must
press RESET or exit the DNC mode before you can run any other programs. If you try to press CYCLE START
before RESET of the previous DNC, you will get the message: RESET FIRST.
DNC supports Dripmode. The control will execute one block at a time from the RS-232 port. Each block
entered will be executed immediately with no block lookahead buffering. The exception is that Cutter Compen-
sation requires three blocks of motion commands to be buffered prior to a compensated block being executed.
There are several restrictions on what can be in a DNC program. An M98 Pnnn may not be programmed to
jump to another part of your program. An M30 is allowed, but it will not reset to the beginning of the program.
The program must begin with a % just like any other program sent over RS-232 and the program must end with
a %. The data rate selected for the RS-232 port by settings must be fast enough to keep up with the rate of
block execution of your program. If the data rate is too slow, the tool may be stopped in a cut when you might
otherwise expect continuous cutter motion. The highest standard RS-232 data rate available is 115,200 bits per
second (VF-E data rate is 38,400).
It is recommended that DNC be run with Xmodem or parity selected because an error in transmission will then
be detected and will stop operation of the DNC program without crashing. The settings page is used to select
parity. The recommended RS-232 settings for DNC are:
9600 or 19200 BITS PER SECOND
EVEN PARITY
RS-232 DATA BITS: 7
1 STOP BIT
XON/XOFF
Full duplex communication during DNC is possible by using the G102 command or DPRNT to output axes
coordinates back to the controlling computer. When DNC is running, BACKGROUND EDIT is not available.
To run DNC in graphics, you must select DNC first , then go to graphics display and send your program to
the CNC
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