Internet PLC Forum

You can use a 1 minute clock "Clk:1min" to toggle a down counter with preset value of 30. So the counter will count down every minute and when it reaches zero, its contact is turned ON. That can be used just like a timer.

You can use fixed point arithmatics. Assuming every unit represents 0.01:

T = 2557 - 1249*A/100000

(Make sure that  you multiply by A first before dividing by 100000)

The resulting value T is x 100.

You can store value of T in timer #1 S.V using SETTIMERSV.

You can store it in timer #1 P.V (present value using  TIMERPV[1] = T.

If you define timer #1 as High speed timer then each unit of T represent 0.01s.

Use CHR$(n) to send non printable character. For what you want to do, execute the followings:

E.g. Print #1 "AT+CMGS=1, 1234567"+CHR$(13)+CHR$(10)+ CHR$(26)

Is your program sending out data out of the COMM1 port? (i.e. execution of PRINT, OUTCOMM, NETCMD$, READMODBUS or WRITEMODBUS commands).  That will interfere with the PC trying to talk to the PLC.  Did you execute SETBAUD command has changed the COMM1 settings?

READMODBUS uses function code 03 to read 16-bit register from a MODBUS slave.

Note that if your slave is RTU, the COMM port number to use is 11 for communicaiton via COMM1 and 13 for communication via COMM3.

jbuilder may have its own JVM but we are not sure whether it is able to run .jar file directly. Why don't you just install the JRE from sun website and try again?

Contrary to your statement, the T100MD888+ PLC is fully capable of receiving binary data using the INCOMM command. It will return whatever binary data it receive one character at a time until buffer is empty and then it will return -1.

Do you have an LCD display? If not, how are you going to show the characters received by the PLC? You can't use the same COMM port for receiving character from the 68HC12 and use it for on-line monitoring because the TRiLOGI software online monitoring sends commands continuously to the PLC and will fill up the buffer quickly.

For what you tried to do (i.e. to have the PLC received the ASCII character for "5" followed by a CR), you can use a clock pulse to periodically check the serial port input and find out if you receive the string "5". If so, turn on an output:
   Clk:1.0s                     Fn_#1
|--||----------{dCusf}

within Fn_#1:

A$ = INPUT$(1)
IF LEN(A$)<> 0
   IF VAL(A$)=5  
        SETIO  OUT1
   ENDIF
ENDIF

If the PLC receive the string "5" it will convert it into integer if it finds that the value received is indeed equals 5 it will turn on the output with label name "OUT1". (You need to define an output with the label name "OUT1" for the program to compile properly.)

There are also many factors to consider for a successful communication. The baud rate and communication format settings must be the same for both the PLC and your 68HC12 board.  You have to make sure that everything are set up properly before trying to verify the communication result.