116 96-8000
June 1999
OPERATION
Note that the Setting 14 selection XON/XOFF is similar to the îš“DC CODESîš” selection. Both of these settings
use the DC1/DC3 XON/XOFF codes to start/stop the sender when data is received too fast. When DC CODES
is selected for Setting 14 (synchronization), serial port #1 will transmit an XON (DC1) if a character has not
been received for five (5) seconds.
XMODEM may also be selected in setting 14. It is a receiverîš–driven communications protocol that sends data
in blocks of 128 bytes. Setting synchronization to XMODEM gives your RS-232 communication an added
level of reliability because each block is checked for integrity. If the receiver determines that the most recently
sent block is in error, it will request that the sender try to send the block again.
In order to use XMODEM, parity must be none, and RS-232 data bits must be set to 8. Also, the computer
that is sending the data must be equipped with a communications package that supports the XMODEM
protocol. It must be set to XMODEM to operate.
This version of XMODEM supports checksum verification only. Also, 512 bytes of memory must be available
before using XMODEM with DNC. XMODEM must use 8 data bits and no parity.
WARNING!
One of the biggest causes of electronic damage is a lack of a good
earth ground on both the CNC and the computer that is connected by
RS-232. A ground fault condition (i.e., a lack of good ground on both)
will damage the CNC or the computer, or both.
Port #2 on the side cabinet is dedicated to auxiliary axes communication. See Auxilary Axis Control for further
more information.
DIRECT N UMERICAL C ONTROL (DNC)
As a standard feature, this machine is shipped with a DNC capability. With DNC, there is no limit to the size of
your CNC programs. The programs are directly executed by the control as they are sent over the RS-232
interface. Note, that this is the first serial port or the top connector. Do not confuse DNC with RS-232 uploading
and downloading.
If you wish to use DNC, it is enabled by Parameter 57 and Setting 55. When enabled, DNC is selected by
pressing MDI a second time when already in MDI. DNC mode will not be enabled unless there is a minimum of
512 bytes of user memory available. When DNC is selected, the PROGRAM DISPLAY will show:
WAITING FOR DNC...
This means that no DNC data has been received yet and you may begin sending data. You must start sending
the program to the control before the CYCLE START button can be pushed. After the beginning of the program
is seen by the control, the display will show part of the program and a message at the bottom, left of the CRT
will show DNC PROG FOUND. After the program is found, you may push CYCLE START just like running any
other program from Memory.
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