User guide

midon design
TEMP08 User Guide Version 4.0x Page 22 of 25
Problem Possible Causes
I added a new sensor and now all I get
is “OW Bus Error” messages
Your sensor is probable reversed on
the 1-Wire bus, OR, there is a short on
the bus. Check your wiring.
I was able to add a new sensor but all I
get is “???” readings from it.
Check your 1-Wire bus wiring. You
may need to add a 100 ohm resistor in
series with a new leg of the bus that
you added.
I removed a sensor from my wiring and
now all I get is “???” readings from it.
Delete the sensor (use the DEL
command).
I added a DS2405 (or 2406 or 2407)
sensor and I cannot see the state
change when I change the input to it.
DS2405, 6 & 7 sensors are not
supported by TEMP08. Consider
using the 1WSwitch product for these
sensors.
I tried to add a bunch of sensors via
the INI command and only some of
them showed up.
Check your wiring.
I have a MD2088 LED display and
LED’s 5 to 8 turn on by themselves
and will not turn off
Make sure that your sensor is set to
the L type, not I type, via the TYP
command.
I have connected 1WIO modules and
the relays or LED’s do not work with
the RLY or LED commands.
Make sure that your sensor is set to
the appropriate O or L type via the
TYP command.
I get “OW Bus Error” messages every
time the LED flashes red.
There is a short on your 1-Wire bus,
OR (hopefully not) the bus was
damaged accidently. This could be a
fatal error requiring a replacement of
the TEMP08. If disconnecting all
sensors from your TEMP08 still results
in this error message, you unit is likely
damaged. Contact Midon Design for
support.
The LED is flashing but nothing is
shown on the terminal output
(Hyperterm or equivalent)
While it is possible that you may have
damaged the MAX232 RS232
interface, it is likely that you have a
terminal emulator setting incorrect.
Check your settings.