Rockwell Automation 57C610 Enhanced Basic Language, AutoMax - Manual (Page 64)

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6.8 Communication Capabilities
BASIC communicates with other processing elements in a system,
including operator's terminals and other application tasks, using the
following statements. A number of these statements access
Processor serial ports.
1. OPEN statement
2. CLOSE statement
3. INPUT statement
4. PRINT/PRINT USING statement
5. IOWRITE statement
6. GET statement
7. PUT statement
8. READ statement
9. DATA statement
10. RESTORE statement
6.8.1 OPEN Statement
The OPEN statement allocates a Processor port to allow application
tasks to communicate with an external device such as a personal
computer. Once you allocate a port, you can use the INPUT, PRINT,
GET, or PUT statements to communicate through the port.
Depending on the port you are allocating, you may also need to use
the CLOSE statement in conjunction with the OPEN statement.
You can allocate a port only in a task running on the Processor that
contains the port. The OPEN statement cannot be used to
communicate with other tasks. See the OPEN CHANNEL statement
description in section 6.6.3 for information about interĆtask
communication.
Ports You Can Use for Serial Communication
Multibus rackĆbased Processor modules have two serial ports,
labeled PROGRAMMER/PORT B" and PORT A", reading top to
bottom. Use the PROGRAMMER/PORT B port for connecting the
Processor to the personal computer running the AutoMax
Programming Executive software. The other port, PORT A, is
available for use by application tasks. If there are multiple Processor
modules in the rack, only the leftmost PROGRAMMER/PORT B port
is reserved for communicating with the Executive software. All other
Processor ports in the rack are available for use by application
tasks.
The PC3000 Processor also has two serial communication ports.
The 25Ćpin DĆshell port works exactly like the PROGRAMMER/PORT
B port on the rackĆbased Processor described above. The 9Ćpin port
works like the
PORT A port on the rackĆbased Processor. On the PC3000, however,
both ports may be available for communication with external
devices, depending on the setting of jumper JP2. Refer to the
PC3000 User Manual, J2Ć3096, for more information on setting the
jumper.