Inserting and Removing DMX Cable - Causing "Unrecoverable" DMX_ERR_IMPROPER_SLOT

[Ben-Rosenfeld-VPS]

Hi,

We see the following when inserting a DMX cable from a lighting console that is actively sending DMX:

In the above image the data in line 6 should have matched the data in line 1.

In software we ultimately perform the following logic:

A. Call to dmx_receive with a wait ticks of 10ms
B. If there is no data for 100ms then the DMX State is changed to 0 (IDLE); this was seen in line 2 in the image
C. If there is data then switch on packet.err
D. When packet.err is set to DMX_ERR_IMPROPER_SLOT log; this was seen in line 3 and 4 in the image
E. Otherwise when packet.err is set to DMX_OK we log the first 10 bytes of the data; as shown in the image line 1 and 6 log data

What is interesting is that after the DMX_ERR_IMPROPER_SLOT, the dmx_receive will always return all 0's for the data. If we then insert and remove the cable multiple times, it will sometimes eventually recover and send the actual data.