I have seen your example but as DrStein99 said E4 P1 (or E1 P1) does NOT trigger the output...

http://www.machsupport.com/forum/index.php?topic=1072.0

Updated to Mach version: 2.0.008

That is odd I have tested it here a few times  Coudl you post an example Gcode and I will see what is going wrong.

Thanks
Brian

Sample:

N0010 (Post processor: Copy of Mach2.post)
N0020 (Date: 25/9/2006)
N0030 G21 (Units: Metric)
N0040 G40 G90
N0050 F1
N0060 (Part: ΒΑΣΙΛΟΠΙΤΑ 3a)
N0070 (Process: No offset LAYER0, Mill/Router, 0,1 mm diameter, 0 mm Deep)
N0080 M6 T0  (Mill/Router, 0,1 mm diameter)
N0090 G43 H0
N0100 G00
N0110 M04
N0120 X90.8241 Y61.4619
N0130 E4 P1
N0140 G03 X101.9983 Y63.6845 I5.1321 J3.3986 F30000.0
N0150 X55.0938 Y110.5891 I-39.2634 J7.6412
N0160 X61.4018 Y101.1485 I1.1759 J-6.0421
N0170 X36.0172 Y162.4322 I-33.3505 J22.0850
N0180 X38.2323 Y151.2963 I-1.2258 J-6.0321
N0190 X38.2323 Y217.6293 I-22.3603 J33.1665
N0200 X36.0172 Y206.4934 I-3.4409 J-5.1038
N0210 X61.4018 Y267.7771 I-7.9659 J39.1988
N0220 X55.0938 Y258.3365 I-5.1321 J-3.3986
N0230 X101.9983 Y305.2411 I7.6412 J39.2634
N0240 X92.5577 Y298.9331 I-6.0421 J-1.1759
N0250 X153.8415 Y324.3176 I22.0850 J33.3505
N0260 X142.7055 Y322.1025 I-6.0321 J1.2258
N0270 X209.0386 Y322.1025 I33.1665 J22.3603
N0280 X197.9026 Y324.3176 I-5.1038 J3.4409
N0290 X259.1864 Y298.9331 I39.1988 J7.9659
N0300 X249.7457 Y305.2411 I-3.3986 J5.1321
N0310 X296.6503 Y258.3365 I39.2634 J-7.6412
N0320 X290.3423 Y267.7771 I-1.1759 J6.0421
N0330 X315.7268 Y206.4934 I33.3505 J-22.0850
N0340 X313.5118 Y217.6293 I1.2258 J6.0321
N0350 X313.5118 Y151.2963 I22.3603 J-33.1665
N0360 X315.7268 Y162.4322 I3.4409 J5.1038
N0370 X290.3423 Y101.1485 I7.9659 J-39.1988
N0380 X296.6503 Y110.5891 I5.1321 J3.3986
N0390 X249.7457 Y63.6845 I-7.6412 J-39.2634
N0400 X259.1864 Y69.9926 I6.0421 J1.1759
N0410 X197.9026 Y44.6080 I-22.0850 J-33.3505
N0420 X209.0386 Y46.8231 I6.0321 J-1.2258
N0430 X142.7055 Y46.8231 I-33.1665 J-22.3603
N0440 X153.8415 Y44.6080 I5.1038 J-3.4409
N0450 X92.5577 Y69.9926 I-39.1988 J-7.9659
N0460 X90.8241 Y61.4619 I3.3986 J-5.1321
N0470 E4 P0
N2220 G00 X0 Y0
N2230 G49
N2240 M200
N2250 M05 M30

Thanks for your reply

It works here (after I took the time to hook the test rig up again ) You need to have the E number one less then the output that you would like to run SO if you would like to turn on and off external output #4 Use "E3 P1" and "E3 P0" .

Thanks
Brian

Thank you Brian

So did it work for you

After some tests I found that Ex Px was not able to solve my problem, partly because of the command itself and partly because the problem is more complex than I expected.

Sample code.

G00 X100 Y100
G01 X110 Y110 <------ From the G00 to the G01 movement there is a stop (accelerations-deccelerations)
G00 X200 Y200
E3 P1              <------ Output4 is not activated
G04 P1000       <------ Wait one second
G01 X300 Y300 <------ Output4 is activated together with the movement
E3 P0               <------ Output4 is deactivated with the start of the next G00
G00 X400 Y400 <----- Bacause of the stop (G01->G00) and the fact that Ex Px is activated with the next move command I still get a dot.
                               I also get a few liquid outside of my contour because of the valve response time and the liquid that is "flying".
M18                 <----- M seems to work better with my semifluid liquid. The time delay of the M gives the liquid time to touch the surface
G01 X495 Y495
E3 P0
G01 X500 Y500 <----- This was my last trick. I close the valve some mm before the end of the movement. There is no acc/decc from
                               G01->G01 and the "flying" liquid (from the valve to the surface) is placed well on the contour.

I am using Sheetcam and I don't know if I will be able to implement this trick to the postproseccor. (freehand contours!)

Is it possible to know when I am getting to the deceleration phase and deactivate my output from inside Mach