User guide

midon design
TEMP08 User Guide Version 4.0x Page 8 of 25
Connect up a straight-through serial cable between TEMP08's J4 connector and
your PC. Open up HyperTerminal (or equivalent terminal emulator program) on
your PC. Configure it to 9600 BPS, No parity, 8 bits, 1 start bit and NO hardware
handshaking (very important!). Power up the TEMP08 and configure the unit for
the devices that you have connected.
We recommend that you next use the ERA command for first time use, to erase
the EEPROM. This will remove any previous information that may have been
stored in the EEPROM. Next use the INI command to search for any 1-Wire
devices connected to the 1-Wire bus. If you get any error messages, it is most
likely a result of a bad connection to the devices. Verify them. Typically, a "OW
bus error" message indicates that a sensor has been installed in reverse, or that
there is a short on the bus.
The INI command is used to search for any new sensors that are present on the
1-Wire bus. Upon completion, the serial number of any new sensor is stored in
permanent memory on the TEMP08 and that sensor is available for interrogation
by the polling process.
Note: an ERA command is not required every time that an INI command is
issued. It should only be required for first time use.
If a DS2408, DS2423 or DS2438 is detected by the INI command, you may get
an error message that requests you to input the unit TYPe. See the table 2 for
details for the valid inputs. If nothing is entered for 1 minute in this field for a
DS2423, then the sensor TYPe will default to “C” (Counter). A DS2438 will
default to “V” (Voltage) if the same timeout occurs. A DS2408 will remain as an
unknown type, until you manually configure it.
Now would be a good time to set the clock using the SCK command. Follow the
prompts and input the correct time in 24 hour format (for example, 2PM is 14:00).
Now program the configuration by using the SET command. Just type SET and
the program will prompt you for the required option settings.
To verify that your setup is working properly, you should next use the TMP
command to perform an immediate sensor reading. The output of the TMP
command should look like the sample below (the exact output will depend on
what type of sensors and how many you have installed).
>
WED 21:51:13
Reading Sensors...
Humidity #01[9F00000037555326]=60%
Barometer #01[A900000037621A26]=28.21 inHg
Voltage #01[020000002B2CB326]=02.60V 05.03V 00mV
Wind Dirn[9F00000001087320]= NNW
Wind Speed[8E00000001562C1D]=00 MPH, Gust = 00