MoTeC Global Forum

I am unable to currently afford an ACL, so am persevering using a GEMS 1 gig CAN datalogger to log my M800 CAN messages. I have set up a custom CAN and can read GPS latitude and longitude, and GPS time by titching together the two 16 bit channels using this loggers data reading software's maths ability. I do not seem to be getting any data at all for satellites in view or GPS quality down the CAN BUS. I may be doing something wrong, but before I tear my hair out would you confirm this info is available by CAN from the M800 and what format I should expect it to be, with what sort of scaling required? Thanks. Maybe the upcoming CAN webinar could touch on stitching GPS 16 bit channels together, I alone know a few Motec users interested in getting a good grasp of this. Will the new ecu's be capable of sending 32 bit channels with no cludging?

Chris Wilson wrote:I am unable to currently afford an ACL, so am persevering using a GEMS 1 gig CAN datalogger to log my M800 CAN messages. I have set up a custom CAN and can read GPS latitude and longitude, and GPS time by titching together the two 16 bit channels using this loggers data reading software's maths ability. I do not seem to be getting any data at all for satellites in view or GPS quality down the CAN BUS. I may be doing something wrong, but before I tear my hair out would you confirm this info is available by CAN from the M800 and what format I should expect it to be, with what sort of scaling required? Thanks. Maybe the upcoming CAN webinar could touch on stitching GPS 16 bit channels together, I alone know a few Motec users interested in getting a good grasp of this. Will the new ecu's be capable of sending 32 bit channels with no cludging?

Chris - I am using a 10-Hz GPS, through and STC (Serial To Can (RS0232)), and the #-sats come through fine.
You should be able to use a windows thing (maybe Hyperterm) and capture the data stream and see if that data is the RS-232 output from the GPS, then start follow the trail of crumbs from there.

This assumes that the GPS starts out on RS-232 and then goes to CAN.
If it starts out on CAN, then I guess you will need to find out what is being sent and if you are looking for the data in the right place.
Which GPS are you using?

The Motec Garmin 5 Hz one that is feeding the M800 via the serial connection. Motec's i2 reads the satellite numbers and quality just fine, and I have set up channels in my Custom Can for them, too, but the GEMS logger doesn't show any data at all for those two. It's proving a bit of a nightmare, but needs must Thanks holmz!