BASIC PROGRAMMING GUIDE
2-42
PRINT
PRINT #,
P.
?
Syntax: PRINT
expr
P.
expr
?
expr
PRINT#
port,expr
P.#
port,expr
?#
port,expr
Where:
expr
= any string, mathematical number, or calculation
port
= serial output port 0 or 1. Your card may have more ports.
Function: Prints value of
expr
to a serial port
Mode: Command, run
Use: PRINT "String",$(0),REGREAD(9)*.007214
DESCRIPTION
PRINT is used to send serial data to any port. Default is COM 0. PRINT #n may be used to write data out of
a modbus port.
If there is no
expr
, a carriage return - line feed combination is sent.
expr
is any combination of
instructions/operators and variables, strings, or literal values. More than one
expr
may be output by
separating them with commas. Values are printed with a leading and trailing space; a list of positive values
separated by commas will thus print with two intervening blanks. A "+" is implied. The "-" symbol precedes
negative values and takes the place of the normal preceding space. Strings and literals are output with no
added blanks. If a comma is the last character in the list then the normal <CR><LF> is suppressed.
The shorthand versions P. and ? are converted to PRINT after each program line is entered, so a P. or ? is
never listed.
The PRINT#
port,
instruction functions exactly like the PRINT instruction, but it directs output to the
designated serial port. When using this syntax, any output directed by the UO command is bypassed.
P.# and ?# are shorthand for PRINT#.
When PRINT #n is used for a modbus port, a required number of parameters in a specific sequence is
required. Modbus transaction types supported are 3 and 16. These are query and write, respectively.
Generally, a modbus ID and register number are required,
A modbus query (read from a slave or other device on a network) is as follows:
PRINT #n,id,3,
address,length
Where: n = modbus port number on board. This is usually 1 or 3 or both. Refer to your board manual.
Id = modbus ID of device you want to get data from
address
is valid modbus address
length
is number of registers to return
After a query, you will want to retrieve the data. This is done through a number of registers and is board
dependent. Generally registers 4781-4786 are used to retrieve data. Refer to your boards manual for specific
information.
A modbus write (write to a slave on a modbus network) is as follows:
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