On Tue, Sep 22, 2009 at 12:17 PM, Vasile Surducan wrot= e: > On 9/11/09, Olin Lathrop wrote: >> David Duffy (AVD) wrote: >> > I am planning to deploy a network of (approx 70) remote devices via >> > CAT5E cabling. It will carry 24Vdc as well as RS485 data at a low >> > speed (2400 baud at a guess). >> >> I don't know what your constraints are, but RS-485 is so 1990s. =A0Nowad= ays >> CAN is a better alternative in most cases. =A0You get the low level coll= ision >> detection, retry, and message checksum validation all handled transparen= tly >> by the silicon in the microcontroller. =A0You have to do these things ma= nually >> in the firmware with RS-485. > > CAN works at 1km ? Yes, depending on the baudrate and whether repeater is used. Reference (long URL): http://www.softing.com/home/en/industrial-automation/products/can-bus/more-= can-bus/high-speed/cia-ds-102-baudrates.php?navanchor=3D3010561 -- = Xiaofan http://mcuee.blogspot.com -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist