Description - Omega DP41-B Series User Manual

8. Command and Response Structure 8. Command and Response Structure

8.5.3 DESCRIPTION

1. COMMAND ERROR occurs when:
a. Command prefix letter is not valid
b. Command suffix is not valid
2. FORMAT ERROR occurs when:
a. Length of the message is either shorter or longer than it should be.
b. Any other character than "0-F" used for hexadecimal values
3. CALIBRATION LOCKOUT ERROR occurs if jumper "S3B" on the Main Board has
been removed to prohibit any changes in calibration.
4. EEPROM WRITE LOCKOUT ERROR occurs if any write ("W") Command has been
issued to the meter and the jumper position "S3-A" on the Main Board of the meter
has been removed
or
External pin 10 on the rear connector "P2" of the meter has been grounded.
5. SERIAL RECOGNITION CHARACTER ERROR occurs if a new value is between
0 to 1F (hex) or larger than 7F (hex). "^", "A", "E", are not valid since those are used
in the special communication command "^AE".
6. SERIAL DEVICE ADDRESS ERROR occurs if the new value is larger than 199
decimal.
7. DECIMAL POINT ERRORS occur if:
a) New value is 0 or larger than 6 (3 when the meter is in the Thermocouple or
RTD modes).
b) New value causes the reading offset to overflow, i.e. if larger that 999999 or
smaller that -99999.
c) New value causes any ot the setpoints to overflow, i.e. if larger that 99999 or
smaller that -99999.
IMPORTANT NOTES:
1) The meter will not respond to a command if the command's recognition character
does not match the meter's recognition character.
2) When in multipoint mode, the meter will test the command's address with the one
previously assigned after the recognition character has been matched. The meter will
not respond to the command if addresses do not match, even if an error has occurred.
3) If the meter is in the Menu or Setpoint mode and receives any transmitted data, it
quits that routine, displays "SERIAL" for up to two seconds, completes its
Communication job, and then resets the meter, i.e., hard reset (RESET 2) from
Menu, or soft reset (RESET 1) from Setpoint.
4) Any attempt to use push buttons when meter is in Transmit/Receive mode will be denied
and followed by the display of "SERIAL", indicating that Communication is in process.
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