User guide

midon design
1WSwitch User Guide Version 1.02 Page 14 of 28
serial number, which is programmed into the sensor at the factory, followed by
the CRC check status and presence status.
An OK will be displayed following the Sensor ID to indicate that the Cyclic
Redundancy Counter (CRC) checksum of the sensor's serial number is good. If
the serial number has a bad CRC, an NG will be displayed. The checksum is
validated during the output of the sensor display.
Following the CRC status, a P or M will be displayed to show the connectivity of
the sensor. A P is displayed is the sensor is present, and an M when it is missing
from the 1-Wire bus.
Following a display of the sensors installed, the output of the DIS display then
shows the 1WSwitch settings that you entered via the SET command.
6.3. Using the EEP and MEM Commands
These two commands provide direct access to the memory of 1WSwitch and, as
such, should be used with extreme caution. After entering the command,
1WSwitch will display the contents of memory. Use the “;” key to advance to the
next memory location, and use the “/” key to go to the previous memory location.
Both commands will wrap around at the appropriate memory boundaries.
To change a memory location using the MEM command, enter a hexadecimal
value after the memory contents are displayed. Valid inputs are from “00” to
“FF”. If the memory location is read-only, an “? Entry Error” error message will
be displayed.
To change a memory location using the EEP command, enter a double
hexadecimal value after the memory contents are displayed. Valid inputs are
from “0000” to “FFFF”.
In both commands, a carriage return (enter) following display of the memory
contents will terminate the command.
Obviously, these commands can be potentially harmful to the operation of
1Wswitch if not used properly. Midon Design recommends that the EEP and
MEM commands only be used under guidance from our support staff.
6.4. TMP Output Display
The TMP output and polled output displays are identical. An example is shown
below.