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Chapter 4 Communication • 54 USER MANUAL
UI1 Send interrupt
EN End
This program sends an interrupt when the X axis is at its slew speed. After a 6 is written to address N
+ 3, the data F1 will be read at address N + 3.
F1 corresponds to UI1.
Controller Response to DATA
Instructions to the DMC-13X8 may be sent in Binary or ASCII format. Binary communication allows
for faster data processing.
In the ASCII mode, instructions are represented by two characters followed by the appropriate
parameters. Each instruction must be terminated by a carriage return or semicolon.
The DMC-13X8 decodes each ASCII character (one byte) one at a time. It takes approximately .350
msec for the controller to decode each ASCII command. However, the VME host can send data to the
controller at a much faster rate because of the FIFO buffer. Binary commands are processed
approximately 30% faster than their corresponding ASCII commands.
After the instruction is decoded, the DMC-13X8 returns a colon (:) if the instruction was valid or a
question mark (?) if the instruction was not valid.
For instructions that return data, such as Tell Position (TP), the DMC-13X8 will return the data
followed by a carriage return, line feed and : .
It is good practice to check for : after each command is sent to prevent errors. An echo function is
provided to enable associating the DMC-13X8 response with the data sent. The echo is enabled by
sending the command EO 1 to the controller.