Inputting String Variables
String variables with up to six characters may be input using the specifier, {Sn} where n represents the number of
string characters to be input. If n is not specified, six characters will be accepted. For example, IN "Enter A,B or
C", V{S} specifies a string variable to be input.
The DMC-40x0, stores all variables as 6 bytes of information. When a variable is specified as a number, the value
of the variable is represented as 4 bytes of integer and 2 bytes of fraction. When a variable is specified as a string,
the variable can hold up to 6 characters (each ASCII character is 1 byte). When using the IN command for string
input, the first input character will be placed in the top byte of the variable and the last character will be placed in
the lowest significant byte of the fraction. The characters can be individually separated by using bit-wise operations,
see section Bit-wise Operators.
Output of Data (Numeric and String)
Numerical and string data can be output from the controller using several methods. The message command, MG,
can output string and numerical data. Also, the controller can be commanded to return the values of variables and
arrays, as well as other information using the interrogation commands (the interrogation commands are described in
chapter 5).
Sending Messages
Messages may be sent to the bus using the message command, MG. This command sends specified text and
numerical or string data from variables or arrays to the screen.
Text strings are specified in quotes and variable or array data is designated by the name of the variable or array. For
example:
MG "The Final Value is", result
In addition to variables, functions and commands, responses can be used in the message command. For example:
MG "Analog input is", @AN[1]
MG "The Position of A is", _TPA
Specifying the Port for Messages:
The port can be specified with the specifier, {P1} for the main serial port {P2} for auxiliary serial port, or {En} for
the Ethernet port.
MG {P2} "Hello World" Sends message to Auxiliary Port
Formatting Messages
String variables can be formatted using the specifier, {Sn} where n is the number of characters, 1 thru 6. For
example:
MG STR {S3}
This statement returns 3 characters of the string variable named STR.
Numeric data may be formatted using the {Fn.m} expression following the completed MG statement. {$n.m}
formats data in HEX instead of decimal. The actual numerical value will be formatted with n characters to the left of
the decimal and m characters to the right of the decimal. Leading zeros will be used to display specified format.
For example:
MG "The Final Value is", result {F5.2}
If the value of the variable result is equal to 4.1, this statement returns the following:
The Final Value is 00004.10
DMC-40x0 User Manual Chapter 7 Application Programming • 160
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