as i posted in the other gauge thread , i want to connect this gauge to my old bike , which uses simple pulse signals for speed and analog signals for temp etc... the new gauge uses k-line and transmits data both ways - half duplex bi directional line. i dont even know where to start , so any help would be apriciated. (btw the tachometer data is not transmited on the k-line, it works old school way with a simple pulse)
Why don't you buy a simple and cheap usb-rs232 ttl dongle??? These are pretty cheap on eb@y!!! This is more flexible and can communicate using abnormal datarates!! Suzuki is 7812 bps!! But yet i don't think that you will do any progress with just the gauges! What you need is an ECU and try to snif the datastream! Then built a program producing the same datastream and make changes and see what happens!!!! RidgeRacer and PetriK should be able to give you some more info on how to do it!!!
Why don't you buy a simple and cheap usb-rs232 ttl dongle??? These are pretty cheap on eb@y!!! This is more flexible and can communicate using abnormal datarates!! Suzuki is 7812 bps!! But yet i don't think that you will do any progress with just the gauges! What you need is an ECU and try to snif the datastream! Then built a program producing the same datastream and make changes and see what happens!!!! RidgeRacer and PetriK should be able to give you some more info on how to do it!!!
i'm a bit confused ,how usb/rs232 gonna help ? the transmission is k-line...
What you need is a USBTTL converter with ftdi chip!!with this converter you can use it to monitor different signals such as ttl level!!! K-line is ttl level i think so it is going to help you!!!
Maybe you should try to find out how the k-line reaches your controller.
The NEC Datasheet says there are two serial ports (3-wire, SPI, 2wire or UART mode)
The k-line should connect to these ports. Maybe on of the ICs is an IC similar to the MC33290 and converts k-line to RS232. Then you should find a connection between Controller pins and the IC and the IC and the connector.
Maybe you should try to find out how the k-line reaches your controller.
The NEC Datasheet says there are two serial ports (3-wire, SPI, 2wire or UART mode)
The k-line should connect to these ports. Maybe on of the ICs is an IC similar to the MC33290 and converts k-line to RS232. Then you should find a connection between Controller pins and the IC and the IC and the connector.
Greetings,
balze2
thanks , i will look for any chips that might do that...