Parameter Generation and Control 9354-4250, Installation And Operation Manual

Page: 73 / 90

PGC, Inc. Appendix B; SmartPad version 0.503 Steady State & Programmable
November 2005 B-32
VI.
TROUBLESHOOTING
:
There are many possible hurdles that can prevent valid data transfer from the SmartPad™ to a
remote terminal and vice-versa. Here is a partial discussion of potential problems and a
recommended correction for the problem:
When the SmartPad™ is powered up it will transmit a log-on header via the RS-232 port. This
header will clear the terminal screen and display the software version number, chamber serial
number, and the current mode of operation.
P. G. C INC. SERIAL #
SOFTWARE VER. X.XXX
OPERATING MODE
If this log-on screen does not appear:
1.)
Verify that the cable is connected properly and the pin out is correct per section II.
2.) Verify the terminal protocol values listed in section III.
If the log-on screen does appear but no characters are echoed from the SmartPad™ to the
terminal:
1.)
Verify the carriage return and line feed translations in the terminal program per section
III.
2.) Attach a temporary grounding conductor from the remote terminal DB-9 connector to the
ground connection on the SmartPad™ 6-position screw terminal strip. (Ground is the
terminal next to the board mounting nut.) If this solves the problem it indicates that there
is a difference in potential between the SmartPad™ common and the machine common.
This is typically only a problem when the SmartPad™ is mounted remotely. To solve
this connect a permanent ground from the SmartPad™ to the cabinet where the terminal
connector is mounted.
Invalid characters are displayed on the terminal when the SmartPad™ is powered up.
1.)
Verify that the cable is connected properly and the pin out is correct per section II.
2.) Verify the terminal protocol values listed in section III.
“INVALID REQUEST” is returned by the SmartPad™.
1.)
A request or an input command has been used that is not active in the current mode.
Either change modes use a different command.
2.) A request or an input command has not been entered properly. Verify that all of the
necessary characters are present. Verify that the required spaces inserted correctly. Note
that decimals and colons are optional. Also note that if an input command is not
complete it will not be valid.
An input command is entered correctly but the data is not accepted.
1.)
This typically means that the data entered exceeds the valid range of the field it has been
entered in to. For instance, a standard machine might have an air set point range of 04.0°C to
86.0°C. If 02.0°C were entered it would be ignored.