Temp variables exceeding LastTvar "Increase the MaxTvars constant"

[Demon]

try array read ...

Thanks, it works perfect with MaxTvars CON 4 now.

    IF (UsartFlag = 1) then        
         ARRAYREAD RecvData,5,MainloopContinue1,[wait(UsartRight,UsartSlave,Usart0,UsartC,Usart2)]
         GOSUB DisplayCOM1
         UsartFlag = 0
       MainloopContinue1:
    endif

    IF (UsartFlag = 1) then        
         ARRAYREAD RecvData,5,MainloopContinue2,[wait(UsartRight,UsartSlave,Usart0,UsartC,Usart3)]
         GOSUB DisplayCOM1_Standby
         UsartFlag = 0
       MainloopContinue2:
    endif

    IF (UsartFlag = 1) then        
         ARRAYREAD RecvData,5,MainloopContinue3,[wait(UsartRight,UsartSlave,Usart0,UsartE,Usart2)]
         GOSUB DisplayCOM2
         UsartFlag = 0
       MainloopContinue3:
    endif

    IF (UsartFlag = 1) then        
         ARRAYREAD RecvData,5,MainloopContinue4,[wait(UsartRight,UsartSlave,Usart0,UsartE,Usart3)]
         GOSUB DisplayCOM2_Standby
         UsartFlag = 0
       MainloopContinue4:
    endif

    IF (UsartFlag = 1) then        
         ARRAYREAD RecvData,5,MainloopContinue5,[wait(UsartRight,UsartSlave,Usart0,UsartD,Usart2)]
         GOSUB DisplayNAV1
         UsartFlag = 0
       MainloopContinue5:
    endif

    IF (UsartFlag = 1) then        
         ARRAYREAD RecvData,5,MainloopContinue6,[wait(UsartRight,UsartSlave,Usart0,UsartD,Usart3)]
         GOSUB DisplayNAV1_Standby
         UsartFlag = 0
       MainloopContinue6:
    endif

    IF (UsartFlag = 1) then        
         ARRAYREAD RecvData,5,MainloopContinue7,[wait(UsartRight,UsartSlave,Usart0,UsartF,Usart2)]
         GOSUB DisplayNAV2
         UsartFlag = 0
       MainloopContinue7:
    endif

    IF (UsartFlag = 1) then        
         ARRAYREAD RecvData,5,MainloopContinue8,[wait(UsartRight,UsartSlave,Usart0,UsartF,Usart3)]
         GOSUB DisplayNAV2_Standby
         UsartFlag = 0
       MainloopContinue8:
    endif

(add another PBP command to the list of stuff I never tried before).

[richard]

it could simplify further

 IF (UsartFlag = 1) then  
        ARRAYREAD RecvData,5,itsadud,[wait(UsartRight,UsartSlave,Usart0)]
 select case RecvData[3]
 case UsartC
    IF RecvData[4] == Usart2 THEN
      GOSUB  GOSUB DisplayCOM1
      else
      GOSUB  GOSUB DisplayCOM1_Standby
    endif
case UsartD
    IF RecvData[4] == Usart2 THEN
      GOSUB  GOSUB DisplayCOM2
      else
      GOSUB  GOSUB DisplayCOM2_Standby
    endif
case UsartE
    IF RecvData[4] == Usart2 THEN
      GOSUB  GOSUB DisplayNAV1
      else
      GOSUB  GOSUB DisplayNAV1_Standby
    endif
case UsartF
    IF RecvData[4] == Usart2 THEN
      GOSUB  GOSUB DisplayNAV2
      else
      GOSUB  GOSUB DisplayNAV2_Standby
    endif
end select
itsadud: 
UsartFlag = 0
endif

[Demon]

it could simplify further...

Definitely, but I'm not finished adding conditions.

I really like your original ArrayRead suggestion; it'll be easy to keep expanding new record layouts (sorry, old mainframe habits ).