Adrie

Dear Pete, Best wishes for the new year! Health and happiness and lots of software challenges! It's been a while ago since i looked into the matter, but i've had many other things to do. Anyway, i've picked it up again and done a test run with logging. I've done this run with FS2004 and FSInterrogate 1.8.0.21 It's with a Cessna 172 standing on the ground, FS2004 is not paused. I've setup the logging (with IPCs now). The log is attached as a zipped file. Then i've done reads and writes with FSInterrogate only, not with my software. I've first read all data a few times, then i've read 0C3E as Signed16bit three times (values are 31, 32, 33 resp. so drift is ticking ok), see 3 lines at 760375 ev. Further on in line 788000 the value shown is 34 (drift is ticking ok). Then i've written 0 (as a Signed16bit) in 0C3E, see line 790000; this seems ok. (a question though: is it normal that only 1 byte is written?) In the next line 790016 i've re-read the data, and it shows 0 correctly, but in reading a second time (see next line 790016) the value popped back to 34. This is exactly the problem i've described previously to you. Then i've repeated write, read and re-read, see line 794703, write value 81 = hex51, reading (next line 794703) shows correctly hex51, but re-reading a bit later in the second-line 794734 the value popped back to 34 (this is the same value as in 788000, so no drift-increment took place). Some more re-reading shows that the value continues incrementing from 34. I hope this gives some insight in the described problem. Regards from Adrie Voordijk FSUIPC_log.zip

Pete, Thanks for your rapid reply. I've installed FSUIPC 3.70 and re-run my tests. The behaviour is the same. I've made 2 test-runs with logging, both with FSUIPC logging (suffix AV1 and AV2) and also my s/w internal logging. I have annotated my 2nd test-run log (AV2) in a word document, so please have a look at that. I hope this will give you enough information to see why i am confused. Thanks in advance and Regards, Adrie FSUIPC logs and AV logs.zip

L.S., I am driving from/to FS2004 via FSUIPC an (external to MS FS) Heading Indicator instrument with a Gyrodrift Compensation knob. FSUIPC is version 3.201 of 16 Febr. 2004. My software reads 3 values via FSUIPC: True Heading in $0580,4 Magnetic Variation in $02A0,2 and Gyrodrift in $0C3E,2. It calculates 'Indicated Heading' (Indic.Hdg = True Heading + Gyrodrift - Magnetic Variation) and sends this regularly to the instrument; this goes fine. I encounter difficulties when the user turns the Gyrodrift Compensation knob on the instrument and i want to send the altered value to FS via FSUIPC. I observe the following: - the start situation is: Gyrodrift=0 degr, Magnetic Variation=-3.0 degr and True Heading=231 degr; the Indicated course is 234 degr, all ok, - my s/w reads the given Gyrodrift Compensation value from the instrument, lets say 0.5 degree, converted to FS 16 bit smallint this gives 81, - my s/w writes via fsuipc this value of 81 in $0C3E,2 - the next time that my s/w reads the 3 values, the Gyrodrift repeats my value of 81, - the problem is that the next time thereafter (16 ms later) my s/w reads a Gyrodrift of 0, so 'something' has overwritten my input. Only when I increase the given value over 192 (is > 1 degr) a non-zero value is read back in the 2nd cycle, but it is still lower than the given value. I have tried the same by: - setting the FS in slew-mode, then update the value, then set back to normal mode, but the same effect, - setting FS drift-simulation OFF, but the same effect. - I have not tried this with a newer version of FS. My questions are: - Do you know about this 'problem'? - Is this solved in newer versions of FS? - Is there another way to in/de-crease the Gyrodrift value in FS? - Is there any other way that you can help me? Thanks in advance and Regards, Adrie