ABB YT204001-FN Processor module

The DMC-18x2 provides over 100 commands for specifying motion and machine parameters. Commands are included to initiate action, interrogate status and configure the digital filter. These commands can be sent in ASCII or binary. In ASCII, the DMC-18x2 instruction set is BASIC-like and easy to use. Instructions consist of two uppercase letters that correspond phonetically with the appropriate function. For example, the instruction BG begins motion, and ST stops the motion. In binary, commands are represented by a binary code ranging from 80 to FF. ASCII commands can be sent "live" over the bus for immediate execution by the DMC-18x2, or an entire group of commands can be downloaded into the DMC-18x2 memory for execution at a later time. Combining commands into groups for later execution is referred to as Applications Programming and is discussed in the following chapter. Binary commands cannot be used in application programs. This section describes the DMC-18x2 instruction set and syntax. A summary of commands as well as a complete listing of all DMC-18x2 instructions is included in the Command Reference.

Command Syntax - ASCII

 DMC-18x2 instructions are represented by two ASCII upper case characters followed by applicable arguments. A space may be inserted between the instruction and arguments. A semicolon oris used to terminate the instruction for processing by the DMC-18x2 command interpreter. Note: If you are using a Galil terminal program, commands will not be processed until ancommand is given. This allows the user to separate many commands on a single line and not begin execution until the user gives thecommand. 

PR is the two character instruction for position relative. 

4000 is the argument which represents the length of the move in counts. Theterminates the instruction. The space between PR and 4000 is optional. When specifying data for the X,Y,Z and W axes, commas are used to separate the axis’ parameters. If no data is specified for an axis, a comma is still needed as a place holder - see below. If no data is specified for an axis, the previous value is maintained. The space between the data and instruction is optional. To view the current values for each command, type the command followed by a ? for each axis requested. This is interrogation. Not all commands can be interrogated. Refer to the Command Reference to determine whether or not a command can be interrogated.

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