Checking a ByteArray Value Used to Store String

[Mechatronics]

Hello Every Body!

I'm using a 16F877A Microcontroller connected to a PC using USART, The terminal program on the PC sends some commands to the MUC in order to perform certain task and the MCU should send a message as response for that command:

for example: the MCU measures the temeperature form its analogue input, if I send the command "Temp" from the PC the MCU should respond to me by sending the temperature read. the problem here is after I read the command I can't check its value as following:

Device = 16F877A
Xtal 8
 
Declare LCD_Interface 4 
Declare LCD_RSPin PORTB.0 
Declare LCD_ENPin PORTB.1
Declare LCD_DTPin PORTB.4 
 
Declare Adin_Res 10       ' 10-bit result required 
Declare Adin_Tad FRC      ' RC OSC chosen 
Declare Adin_Stime 50     ' Allow 50us sample time 
 
ADCON1= %10000000       
Input PORTA
 
Dim Digital As Float
Dim Analogue As Float 
Dim Temp As Float 
Dim RSI[3] As Byte
 
Main:
 
    Digital = ADIn 0 
 
    Analogue = (Digital * 5) / 1024
Temp = Analogue * 100
 
    Print At 1,1,"Temp.: ",Dec Temp
 
    SerIn PORTC.1,1,1000,[Str RSI]
 
    If Str(RSI) = "Tem" Then 
        SerOut PORTC.0,396,["Temperature: ",Dec Temp ,10,13]     
    End If  
 
GoTo Main

I'm getting an error at the IF-Then Statement
anyway to do the required. In General how can check for a string like this.

Thank You!

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[John Drew]

One way to achieve it is to use the
Rsin Wait("Tem"), SerData
approach. This won't work if the PIC also has to check for other strings but if it's just this one it should work fine.
By the way I notice you haven't updated your status. Let me know if you need help doing this.
John

It might be better to change to an 18F as the compiler supports a lot more commands for strings.

[Mechatronics]

Thank you John for your replay
I got what you mean but yes the MUC has to check for other strings.
I think I have to change to 18F.

Thank you again

[John Drew]

Alternatively you can bring the information into an array (or individual variables) and then do a While/Wend loop through the array searching for the characters of "TEM" one at a time, drop out if there is no E after a T and so on.
Bit more coding for you but it would work.
There must be a reason you are not using HRSin which has the advantage of having a register you can check to see if there is a character waiting - saves hanging around waiting.
John