Fanuc serial interface

[Shukman]

Hi, does anyone have documentation on the Fanuc serial interface 2 to plug in a linear scale encoder. Protocol Is that the RS232?

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[PCW_MESA]

Hi, does anyone have documentation on the Fanuc serial interface 2 to plug in a linear scale encoder. Protocol Is that the RS232?

I'm familiar with the serial interface 1, its a proprietary RS-422 (separate TX and RX differential pairs) interface with a outgoing request pulse and 77 incoming bits of data with 5 CRC bits at a 1.024 mbits/sec

Pretty sure the type 2 interface is RS-485 (single differential pair for TX and RX) at a 2.048 mbits/sec rate but have not made an interface for it yet so not sure

[Shukman]

I have found an information on the interface in the documentation for the encoders. How can I generate a request signal. What is the data transfer rate of the interface and the number of data bits. Are there any start bits, parity bits, and stop bits in the request?

[PCW_MESA]

As I said for type1 the data rate is 1.024 mbits/second, the number of bits is 77 (including 5 CRC bits)
so its not like a standard 8 bit Async serial data stream at all.

for type 1 the request is just a single pulse, Not sure about type2 except type 2 is half duplex (single pair)

[drdos]

Which Fanuc controller do you have? Fanuc has desinated connectors in the controller to talk to these scales. You have to set a parameter bit in the controller before the controller can look at the scale.