Mesa 7I84 problem

At card 7i74 I plugged in at chan0, chan1 and chan2. I'll use chan3 and chan4 for another cards 7i84. I shouldn't use chan0?

Not sure if it was 0 or 7, one of them has RS485 capabilities
There are 7 of them left, so plenty.
EDIT:
Just checked, that info was wrong, my bad, removed it.

tommylight wrote: Not sure if it was 0 or 7, one of them has RS485 capabilities
There are 7 of them left, so plenty.
EDIT:
Just checked, that info was wrong, my bad, removed it.

Channel 7 has the 2 wire half duplex rs485.

Channel 7 on a 7I74 supports RS-485, but this does not interfere with its use
for SSerial (its 4 wire RS-485 and the enable is set true), But note that
the 7i92_7i77_7i74D configuration only has 6 sserial channels (port 1 channels 0..5)
on the 7I74 due to space limitations in the 7I92s FPGA. You also have a free
SSerial channel on the 7I77 (port 0 channel 2)

Port 1 Channel 0 not working might be a cabling issue or 7I74 power issue
(is the 7I92 jumpered to supply power to the 7I74?)

tommylight I wanted to tell You - thanks a lot! Problem resolved. All cards are present in linuxcnc. First card had a problem with plugin RJ45.

PCW thanks for Your explanation how it works.