Is j1939 half duplex or full duplex?

[lecutus]

Is j1939 half duplex or full duplex?

In other words is j1939 like a radio, only one person can talk at a time? Or is it more like telephone where both parties can talk and listen at the same time?

Thirdly, does it depend on the architecture of the chip used?

I'm using pic18f258, pcwhd 4.079.

Thanx

L.

[Jeff King]

Half duplex with collision detection

[PCM programmer]

That's because the physical layer for J1939 is the CAN Bus, and that's
half-duplex. Reference:
http://www.usbtocan.com/Articles/What%20is%20CAN.htm

[lecutus]

Thanks that's all I need. This is why I like this place, the simple answer and why it is(the reason).

L.