xx = one or two digit destination address 

 0  sends the command to all parts of the display

 1  Top Front Logic Display (FLD)

 2  Bottom Front Logic Display (FLD)

 3  Rear Logic Display (RLD)

 4  Front PSI 

 5  Rear PSI

 6  Front Holo

 7  Rear Holo

 8  Top Holo

T = one letter command, as below: 

 T  display mode

 P  parameter

 W  wait

 D  HP off

 M  Set message (for logics)

yyy= parameter value or message string, varies in length and meaning depending on the preceding letter command, see below.

 T1     default

 T2     flash - permanent on logics/PSI, but HP off after 2s. Follow by a 0W4 to silence after 4 seconds

 T3     alarm - permanent on logics/PSI, but HP off after 2s. Follow by a 0W4 to silence after 4 seconds

 T4     short circuit - lasts for 8 seconds or so

 T5     scream - similar, lasts for a short while

 T6     leia - looong 20 seconds

 T10    Star Wars

 T11    Imperial March - no HPs. Looks more like an "error"

 T92    Spectrum - "Disco" display, works on front logics only

 T100   Display message on logics

 6P91   change HP do digital - will change all HPs

 5P91   change PSI to digital (if Velchecks PSIs connected to rear PSI)

 0P61   characters to Aurabesh

 0P60   characters to Latin (normal)

Cancels the previous mode after a yy seconds, doesn't work reliably on all modes. 

For example

 0T2     starts flash mode

 0W4       will stop flash mode after 4 seconds 

 3MHELLO WORLD   \r sets rear logic text to "HELLO WORLD   ", only caps recognized

Example of text handling

 3Mmessage to display in caps\r     presets the text of the logic, but does not display it

 3T100                              switches to message display, of message previously set

 3P61                               changes to Aurabesh

 3P60                               back to Latin

 3T1                                display back to normal random pattern

 6P91   change all HPs to digital

 6T1    turn holo on (this is weird, as 1 should be normal off!)

 6D     turn holo off

 6T4    flickers holo for 4 seconds (using short circuit mode)

 6T6    flockers holo for 11 seconds (using Leia mode)