Specifications

Command Set 4-21
to ensure proper operation of the microprocessor. The timer may be tripped
if the microprocessor is executing its program improperly due to power
transients or static discharge.
If the NOT READY error persists for more than 30 seconds, check the power
supply to be sure it is within specifications.
PARITY ERROR
A parity error can only occur if the module is setup with parity on (see Setup).
Usually a parity error results from a bit error caused by interference on the
communications line. Random parity errors are usually overcome by simply
repeating the command. If too many errors occur, the communications
channel may have to be improved or a slower baud rate may be used.
A consistent parity error will result if the host parity does not match the
module parity. In this situation, the easiest solution may be to change the
parity in the host to obtain communication. At this point the parity in the
module may be changed to the desired value with the SetUp (SU) command.
The parity may be changed or turned off by using Default Mode.
SYNTAX ERROR
A SYNTAX ERROR will result if the structure of the command is not correct.
This is caused by having too few or too many characters, signs or decimal
points missing or in the wrong place. Table 4.1 lists the correct syntax for all
the commands.
VALUE ERROR
This error results when an incorrect character is used as a numerical value.
Data values can only contain decimal digits 0-9. Hex values used in the
SetUp (SU) and Digital Output (DO) commands can range from 0-F.
WRITE PROTECTED
All commands that write data into nonvolatile memory are write-protected to
prevent accidental erasures. These commands must be preceded with a
Write Enable (WE) command or else a WRITE PROTECTED error will
result.