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THE CPL PROTOCOL 6 - 3
6.2 EXAMPLE PROGRAM FRAME
In the COMMAND REFERENCE SECTION a very short programming example is
given for each command. All examples are written in GW-Basic and able to run
on an IBM-compatible PC. The example program expects the oscilloscope to be
connected via COM1 port (RS-232) with a RS-232 null modem cable and to be
setup at 9600 baud, 8 databits, no parity, 3 wire, xon/xoff = off (Menu UTILITY).
The following program lines are an example frame work. The frame work lets you
embed any of the example programs shown in the COMMAND REFERENCE
SECTION.
Program frame:
10 OPEN "COM1:9600,N,8,1, CS0, DS0, CD0" AS #1:’open serial port
*
)
999 END
1000 ’- synchronize on acknowledge & handle error:
1010 INPUT#1,ACK
1020 IF (ACK=0) THEN GOTO 1110
1030 IF (ACK<0) OR (ACK>4) THEN GOTO 1100
1040 PRINT "ERROR: ";ACK;
1050 ON ACK GOTO 1060,1070,1080,1090
1060 PRINT "SYNTAX ERROR" : END
1070 PRINT "EXECUTION ERROR" : END
1080 PRINT "SYNCHRONISATION ERROR" : END
1090 PRINT "COMMUNICATION ERROR" : END
1100 PRINT "UNKNOWN ACKNOWLEDGE" : END
1110 RETURN
First the serial port of the PC is opened (line 10) with the settings of the
oscilloscope communication parameters
**
)
Following that, the example program lines from the COMMAND REFERENCE
SECTION can be executed.
The subroutine to synchronize on the <acknowledge> returned from the
oscilloscope starts at line 1000.
*
) The oscilloscope communication parameters are stored in battery backup
memory when the oscilloscope is turned off. On power-up the parameters are
restored.
... Insert Example Programs Here