Yes yes yes, finally !

This is what was required to make it work.

Code:
sigstrength:

    IF jump = 1 THEN rssioff     ; check input to reset to serial                                             
    DEBUGIN  1500,sigstrength,[WAIT("aSSRSSIS-"),DEC3 sigfield, DEC3 sigcontrol]    ; get signal strength values                                         
    LCDOUT  $FE,$80," Light Unit ",#sigfield                                       
    LCDOUT  $FE,$C0," Control Unit ",#sigcontrol                                         
    GOTO sigstrength

Note change(s). Apparently the photo of the display in RSSI is parsed by the software to separate lines. In reality it's a single stream of both items per second. The LCDOUT needed # for ASCII.

Rob