CNC_DNC | PROGRAM

Sends NC command data to CNC(for DNC operation).

When the data processing on the CNC side is delayed and the data cannot be transferred,
this function waits until it can be transferred.
If an application cannot wait, use the cnc_cdnc function.

The procedure of DNC operation is as follows.

In case of Series 15, the parameter No.20 must be set to '15'.
Even if this setting is not done, this function does not return error.

In case of Series 16/18/21, 0i, Power Mate i, "DMMC" signal(DI)<G042#7> must be on.
Even if this setting is not done, this function does not return error.

For transferring the data, there are 16 buffers of 256 bytes in case of Series 15, and there are 4 buffers of 256 bytes in case of Series 16/ 18/21, 16i/18i/21i, 0i, Power Mate i.
One buffer is used at each cnc_dnc calling without any relation to the data size. Therefore, the maximum size which can be transferred by one calling is 256 bytes.

For series Series 16/18/21, 16i/18i/21i, 0i system, set the CNC parameter (No.8706#0=1) to make the High Speed DNC interface be available.
High Speed DNC uses the single data buffer, which is 40K bytes size ring buffer.
Application can call the cnc_dnc() multiple times until the buffer becomes full.

Because importance is attached to the speed of data transfer to the CNC, in general, return of errors(EW_DATA, etc.) may be delayed.
Namely, an error status may refrect the result caused by the previously executed cnc_dnc callings.
And the error status for some cnc_dnc callings just before the finish of DNC transferring is returned by "End of DNC".

Format of NC command data to be executed

NC command data to be executed on CNC is a string composed of ASCII characters as following format.

LF NC command1 LF NC command2 LF ... LF Mxx LF %

where,

LF	0x0A ('\n': EOB)
Mxx	M code at the end of the DNC operation(M02,M30,etc.)

'LF' must be placed at the top of the whole NC commands, and '%' at the end.
'LF's are added after each NC commands.
For example, to execute the commands such as

M3 S2000 ;
T14 ;
G0 X10. ;
G0 Z-5. ;
M30 ;

cnc_dnc( "\nM3S2000\nT14\nG0X10.\nG0Z-5.\nM30\n%", 32 ) ;

cnc_dnc( "\n", 1 ) ;
cnc_dnc( "M3S2000\n", 8 ) ;
cnc_dnc( "T14\n", 4 ) ;
cnc_dnc( "G0X10.\n", 7 ) ;
cnc_dnc( "G0Z-5.\n", 7 ) ;
cnc_dnc( "M30\n", 4 ) ;
cnc_dnc( "%", 1 ) ;