Quote:
|
Originally Posted by amateurrobotguy
Can't you just get rid of the converter chip altogether when using the edu-rc and just run a pwm cable from the ttl on the camera board to the ttl on the edu-rc since it has the 3 pin ttl on it and the camera board has 3 as well?
|
Just to be clear, there are three serial ports on the CMUCam2 that can be used.
- One DB9 RS232 port (the one used to hook to our PCs or the RC/EDU Program port)
- One three-pin pwm cable RS232 port (used with our TTL-Converter chip to hook to the RC/EDU with the addition of a power line.)
- One 4-pin pwm cable TTL level port that requires a special PWM cable to hook to the RC/EDU TTL port without the TTL-Converter chip **** Don't attempt with a normal PWM cable
You cannot hook the CMUCam2 3-pin RS232 port directly to the RC TTL port without the TTL-Converter chip so don't try it. The TTL Converter changes the signals from RS232 to TTL.
The TTL port on the CMUCam2 has 4-pins and two of the pins are in a different order than the RC expects. If you hook them up without making a special cable you can destroy something and they won't be able to talk anyway.
In general, the TTL port will be more susceptible to noise than either of the two RS232 ports as the cable to reach the RC gets longer.