Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 111)

Chapter 7
Using the Serial Ports
7-3
ATTENTION: With eor and eof set to 0, any readln() call
you make in applications never terminates. Use the raw read()
call to read from the serial ports.
Use the OS-9 system management utilities tmode and xmode to set
up or view the communication parameters for the control-coprocessor
serial ports.
Use this mode: To display or:
tmode
temporarily change the operating parameters of the current terminal session;
tmode
affects
open paths and not the device descriptor; when the path is closed, the changes are lost
xmode
change the initialization parameters of any control coprocessor serial port; these changes will be
inherited by any process that subsequently opens the path; the changes persist as long as the
control coprocessor is running (even when paths to the device are repetitively opened and
closed;
xmode
updates the device descriptor for the port; use the CC_VALCOMM utility (page
7Ć4) to make changes persist through reset/power cycles.
If you have an application that was designed prior to release 1.3 and you
require the original settings of the serial port COMM1, for example,
include
xmode commands in the startup file with the following argument:
xmode /t1 normal
This returns the serial-port settings to the settings used before firmware
release 1.30. See the next section for a description of CC_VALCOMM, a
utility that saves the changes made after an
xmode operation and retains
the changes over power cycles.
See Figure 7.1 for the default settings for tmode and xmode .
Figure 7.1
Set Up Communication Parameters