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DMC-2X00 Chapter 7 Application Programming y 107
These keywords may be used in an applications program to decode data and they may also be used in
conditional statements with logical operators.
Example
Instruction Interpretation
JP #LOOP,P2CD< >3 Checks to see if status code is 3 (number received)
JP #P,P1CH="V" Checks if last character received was a V
PR P2NM Assigns received number to position
JS #XAXIS,P1ST="X" Checks to see if received string is X
Using Communication Interrupt
The DMC-2x00 provides a special interrupt for communication allowing the application program to be
interrupted by input from the user. The interrupt is enabled using the CI command. The syntax for the
command is CI n:
n = 0 Don't interrupt Port 2
n = 1 Interrupt on <enter> Port 2
n = 2 Interrupt on any character Port 2
n = -1 Clear any characters in buffer
The #COMINT label is used for the communication interrupt. For example, the DMC-2x00 can be
configured to interrupt on any character received on Port 2. The #COMINT subroutine is entered
when a character is received and the subroutine can decode the characters. At the end of the routine
the EN command is used. EN,1 will re-enable the interrupt and return to the line of the program where
the interrupt was called, EN will just return to the line of the program where it was called without re-
enabling the interrupt. As with any automatic subroutine, a program must be running in thread 0 at all
times for it to be enabled.
Example
A DMC-2x00 is used to jog the A and B axis. This program automatically begins upon power-up and
allows the user to input values from the main serial port terminal. The speed of either axis may be
changed during motion by specifying the axis letter followed by the new speed value. An S stops
motion on both axes.
Instruction Interpretation
#AUTO Label for Auto Execute
speedA=10000 Initial A speed
speedB=10000 Initial B speed
CI 2 Set Port 2 for Character Interrupt
JG speedA, speedB Specify jog mode speed for A and B axis
BGXY Begin motion
#PRINT Routine to print message to terminal
MG{P2}"TO CHANGE SPEEDS" Print message
MG{P2}"TYPE A OR B"
MG{P2}"TYPE S TO STOP"
#JOGLOOP Loop to change Jog speeds
JG speedA, speedB Set new jog speed
JP #JOGLOOP
EN End of main program