In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi Kramer;

Yes, in one of the 10 Megabit/sec designs where one card rack communicates with another card rack, the driver/receiver is 485, and I can reliably run a few hundred feet.

I also use 10 Megabit/sec on the card rack backplane itself, and there it is straight CMOS in/out from the SX.

To summarize the setup, I have a 10 Mbit/s bi-directional serial backplane bus connecting 16 SX's to an SX backplane controller, and 5 of these rack controllers' SX driven 485 interfaces through a few hundred feet of twisted pair to a central SX orchestrating all communications.

So all together; 80 SX based I/O cards CMOS interfaced to 5 SX controllers connected via 485 to 1 SX host, all happily chugging at 10 Mbits/sec.

Typically I don't use 232 unless I must connect to a device having only that interface available.

Hope that clears things up.

Peter (pjv)

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