There is no DMX output from the DMX Out port on the TX-1.
Description/Explanation of Issue
The DMX Out port on a TX-1 is not a passive thru port, and it does not regenerate incoming DMX. It is only used to output DMX addresses programmed in the commissioning software.
If you need to run DMX to a device downstream of a TX-1, use touch-and-go wiring to land the in and thru lines to the same terminals on the input.