CAN@NET NT 200 - ASCII message

Please help and give me advice. I can not send CAN frames in ASCII mode.

CAN@net NT device is configured in CAN Gateway Configurator V6 to ASCII mode. Port and term char are default. Transport protocol is TCP.

CAN H and L of port 1 is wired to port 2, also GND. Cable length only few inches, 120 Ohm resistor at both ports.

CAN commands in this order works for both ports, all with R ok response:
CAN 1 STOP
CAN 1 INIT STD 500
CAN 1 FILTER CLEAR
CAN 1 FILTER ADD STD 0 0
CAN 1 START

BUT next command always give error, LED turn to red:
M 1 CSD 101 1 2 3 4 5 6 7 8

randomly one of these:
E 1 ErrorWarning set
E 1 ErrorWarning reset
E 1 busoff

What am I doing wrong???

Hi @Joe1,

Are you sure that the CAN ID is correct?

Can you provide a CAN trace?

I would recommend opening a support case at support.hms-networks.com with your local office for the quickest response if this is a critical issue.