Mesa 7i96s pktUAT on P1

Because the 7I96S RS-485 interface is 6 pins of TB2 (15 .. 20)
and has a 6 pin connector.
 

The answer is:
0000EBFF
00002BFF
00006BFF

and it dosent care if the loopback is connected or not

the 6 pin plug is this the contraption with resistors?
 

If that result is with RX+ connected to TX+ and RX- connected to TX-
on the plug, and this is a 7I96S, then the RS-485 interface has been damaged.

Hi PCW,

thx for your effort.

OK-- I just realise your strategy : We tested P1 and found the Hardware OK at P1 and than I fell into a trap with the loopback ---I assumed we were going to something similar to what you have been suggesting in

forum.linuxcnc.org/38-general-linuxcnc-q...-modbus-help?start=0

loop the onboard rs-485 to the pktUARTS on P1 so yesterdays results were the results of such a test.

But you wanted me to test a direct loopback from RX+ to TX+ and RX- to TX- of the onboard RS-485 -- sry my fault

The result of this test is:

without loopback:
0000EBFF
00002BFF
00006BFF
with loopback:
0000EBFF
00000BFF
00006BFF

 

That indicates that the RS-485 interface is OK

Perfect!

We established that P1 is Working and the on board rs-485 is working.

Now we can move on to the start:

How to implement pktUART on P1?

I think your bit file should work (assuming your external RS-485 interface
automates RS-485 driver enable control)

The fact that you could not get the RS-485 interface on TB2 to operate
suggests a test issue.