Megatune COM port problems
#4
9600 is the common default unless you use the MSII downloader, then you have to change it.
The com ports don't show up unless the device is plugged in because the com port isn't being used.
If you need a com port outside of 1-4 no you cannot use easytherm but you can use the MSII downloader to flash the .s19 file that easytherm creates to pretty much any com port you desire.
Good info.
The com ports don't show up unless the device is plugged in because the com port isn't being used.
If you need a com port outside of 1-4 no you cannot use easytherm but you can use the MSII downloader to flash the .s19 file that easytherm creates to pretty much any com port you desire.
Good info.
#12
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This applies much more to MS2 than MS1 due to the rates involved, but this article by Maxim (who make the serial chips) describes the mechanism by which poor accuracy of clock rates causes data corruption and failure of the comms link.
http://www.maxim-ic.com/appnotes.cfm...te_number/2141
MS2 serial clock is pretty accurate, but many cheap USB adapters and laptop built in ports are not so good. As you can see, there isn't much room for error.
Compounding this is the fact that most devices do not report framing errors. I'm not sure what MS2 code variants do with the framing errors, however they do have access to that information on the ECU side even if your PC is not reporting/logging it.
Fred.
http://www.maxim-ic.com/appnotes.cfm...te_number/2141
MS2 serial clock is pretty accurate, but many cheap USB adapters and laptop built in ports are not so good. As you can see, there isn't much room for error.
Compounding this is the fact that most devices do not report framing errors. I'm not sure what MS2 code variants do with the framing errors, however they do have access to that information on the ECU side even if your PC is not reporting/logging it.
Fred.
#13
I haven't been able to connect to my Megasquirt. I'm using a serial to USB adapter, so maybe that is the issue. Have any of you guys had success with that? Do you guys have any suggestions, tips, or potential things to try? Here's the error I'm getting. :(
*edit- I've tried what the message tells me to try so that is not the issue, I'm not quite that retarded, I don't think.*
*edit- I've tried what the message tells me to try so that is not the issue, I'm not quite that retarded, I don't think.*
#15
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Join Date: Feb 2007
Location: 11368 miles from where i would like to be
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EDIT : you can't communicate with it until you have a port to communicate through! Something is wrong with your pc setup. Probably your usb serial is on com7 or something?
Original post : Ummm, did you load some code to it first? (they don't come with code 9/10, ms2 anyway)
Original post : Ummm, did you load some code to it first? (they don't come with code 9/10, ms2 anyway)
#16
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The first time is always tricky, since you don't really know if it's the PC or the MS. My experience largely mirrors rb26dett's observations- that one way to be certain is to do a firmware download into the MS.
If you have a null modem available (and know what the hell one is) then you can verify your PCs serial port against another machine that way using HyperTerm or similar.
If you have a null modem available (and know what the hell one is) then you can verify your PCs serial port against another machine that way using HyperTerm or similar.
#17
I haven't been able to connect to my Megasquirt. I'm using a serial to USB adapter, so maybe that is the issue. Have any of you guys had success with that? Do you guys have any suggestions, tips, or potential things to try? Here's the error I'm getting. :(
*edit- I've tried what the message tells me to try so that is not the issue, I'm not quite that retarded, I don't think.*
*edit- I've tried what the message tells me to try so that is not the issue, I'm not quite that retarded, I don't think.*
To find out what port the USB adapter is using, first make sure the adapter is plugged in and its light is on. Then right-click My Computer and select Manage. Select Device Manager at the left, then scroll down the right hand column until you find the entry that says "Ports (COM & LPT)". Click the plus sign next to it. You should see an entry that looks like "USB Serial Port (COMx)" where x is the number of the port it has grabbed.
If it's one of the DIYAutoTune.com USB adapters and it's not showing up in the Device Manager, grab the driver from our website.
If it's grabbed a port number higher than 4, I recommend changing it to a lower number. Double-click the USB Serial Port item. Then select the Port Settings tab at the top of the box that pops up and click the button marked Advanced. You will see a new screen where you can specify the COM port number; set it to a number less than 5 that is not already in use. Then click OK to close that screen, and OK to close the Properties box. This will set your USB adapter to a lower port number.
#18
Yeah... I'm a complete computer noob, the majority of what you guys are saying looks like Chinese to me. I haven't loaded any code to the MS, I'll try to figure that out tonight and see if I make any progress. Thanks for the input, if you guys think of anything else, or have any tips or suggestions I'd really appreciate it.
#19
Looks like you've either configured MegaTune for the wrong COM port under Communications -> Settings, or you have a driver issue with the USB adapter.
To find out what port the USB adapter is using, first make sure the adapter is plugged in and its light is on. Then right-click My Computer and select Manage. Select Device Manager at the left, then scroll down the right hand column until you find the entry that says "Ports (COM & LPT)". Click the plus sign next to it. You should see an entry that looks like "USB Serial Port (COMx)" where x is the number of the port it has grabbed.
If it's one of the DIYAutoTune.com USB adapters and it's not showing up in the Device Manager, grab the driver from our website.
If it's grabbed a port number higher than 4, I recommend changing it to a lower number. Double-click the USB Serial Port item. Then select the Port Settings tab at the top of the box that pops up and click the button marked Advanced. You will see a new screen where you can specify the COM port number; set it to a number less than 5 that is not already in use. Then click OK to close that screen, and OK to close the Properties box. This will set your USB adapter to a lower port number.
To find out what port the USB adapter is using, first make sure the adapter is plugged in and its light is on. Then right-click My Computer and select Manage. Select Device Manager at the left, then scroll down the right hand column until you find the entry that says "Ports (COM & LPT)". Click the plus sign next to it. You should see an entry that looks like "USB Serial Port (COMx)" where x is the number of the port it has grabbed.
If it's one of the DIYAutoTune.com USB adapters and it's not showing up in the Device Manager, grab the driver from our website.
If it's grabbed a port number higher than 4, I recommend changing it to a lower number. Double-click the USB Serial Port item. Then select the Port Settings tab at the top of the box that pops up and click the button marked Advanced. You will see a new screen where you can specify the COM port number; set it to a number less than 5 that is not already in use. Then click OK to close that screen, and OK to close the Properties box. This will set your USB adapter to a lower port number.
#20
Could my data cable be bad? Maybe the port on the MS or computer? I'm trying to hook up my MSPNP to my laptop with a serial port, but should the port only show up when the MS is plugged in? Because there is a port listed, but nothing changes when I plug in the MS.
I specify com2 which is the only port that could be it (at least i'm pretty sure that is it) and I even changed the one port from com1 to com2 to check to see if that had anything to do with it. Still no dice.
I'll give diyautotune a call tomorrow, but I wanted to check on here to see if anyone can point me in the right direction, I'm stumped.
I specify com2 which is the only port that could be it (at least i'm pretty sure that is it) and I even changed the one port from com1 to com2 to check to see if that had anything to do with it. Still no dice.
I'll give diyautotune a call tomorrow, but I wanted to check on here to see if anyone can point me in the right direction, I'm stumped.