midon design 1WSwitch User manual

midon design
1WSwitch User Guide Version 1.02 Page 1 of 28
A 1-Wire Serial Interface
1WSwitch
Figure 1 1WSwitch
1WSwitch User Guide Version 1.02
November 18, 2008

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1WSwitch User Guide Version 1.02 Page 2 of 28
1. Table of Contents
1. Table of Contents ..........................................................................................2
1.1. List of Tables ..........................................................................................3
1.2. List of Figures .........................................................................................3
2. Introduction....................................................................................................4
3. Installation......................................................................................................6
4. Using 1WSwitch.............................................................................................7
5. Using 1-Wire Switch Sensors ........................................................................9
6. 1WSwitch Commands .................................................................................10
6.1. Using the SET Command .....................................................................12
6.2. The DIS Display Output ........................................................................13
6.2.1. DIS output explanations ................................................................13
6.3. Using the EEP and MEM Commands...................................................14
6.4. TMP Output Display .............................................................................14
6.5. Missing Sensor Display ........................................................................15
6.6. Options .................................................................................................16
6.6.1. On Board ADC Display (DAD).......................................................16
6.6.2. Once Per Minute Time Display (DTI).............................................16
6.6.3. Enable DS2408 Input Poll (EIN) ....................................................16
6.7. DS2408 Based Relay and LED Usage .................................................17
7. J5 Usage .....................................................................................................18
8. Software Change History.............................................................................20
8.1. Upgrading 1WSwitch Software .............................................................20
8.2. Upgrade Instructions ............................................................................20
9. Trouble-Shooting Problems with 1WSwitch .................................................22
10. Error Messages........................................................................................23
11. 1WSwitch Schematic ...............................................................................24
12. 1-Wire Sensors ........................................................................................25
13. Legal Disclaimer.......................................................................................28

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1WSwitch User Guide Version 1.02 Page 3 of 28
1.1. List of Tables
Table 1 1WSwitch Command List .......................................................................10
Table 2 EIN Settings Recommended..................................................................17
Table 3 RJ-12 Pin-outs in use.............................................................................18
Table 4 1WSwitch Software History....................................................................20
Table 5 Common 1WSwitch Problems and Resolutions.....................................22
Table 6 1WSwitch Error Messages.....................................................................23
Table 7 Reset Type Messages ...........................................................................23
Table 8 Midon Design – Available/Compatible Sensors .....................................26
1.2. List of Figures
Figure 1 1WSwitch................................................................................................1
Figure 2 Location of Connectors...........................................................................6
Figure 3 DS2405 or DS2406 Applications ............................................................9
Figure 4 Connector J5 RJ-12 Pin-out..................................................................18
Figure 5 1WSwitch Top View..............................................................................21
Figure 6 1WSwitch Schematic ............................................................................24
Figure 7 DS2405 Pinout......................................................................................25
Figure 8 DS2406 & DS2407 Pinout ....................................................................25
Figure 9 DS2408 Pinout......................................................................................26
Figure 10 DS2438 Pinout....................................................................................26

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1WSwitch User Guide Version 1.02 Page 4 of 28
2. Introduction
Thank you for your purchase of the 1WSwitch 1-Wire Serial Interface. The
following instructions will assist you in configuring and operating the product.
1WSwitch is a stand-alone 1-Wireinterface providing standard serial
commands to control the Dallas/Maxim 1-Wire bus and some specific devices
used on it. Sensors can be polled on a regular basis (from 1 to 99 minutes), or
manually interrogated.
In a typical application, 1WSwitch is connected to a serial port on a PC. Serial
interface software is then used to gather the data received from 1WSwitch and
process it. Users have interfaced 1WSwitch into the HomeSeer product, which
can be used to automate lights, HVAC, sprinklers, and other devices, based on
the sensor readings from 1WSwitch.
The 1WSwitch provides a serial interface for the following 1-Wire devices:
• Multiple DS2438-based Voltage Sensors
• Multiple DS2405 input/output sensors
• Multiple DS2406 (or DS2407) input/output sensors
• Up to 20 1WIO relay interface modules (or equivalent DS2408 based relay module)
available from Midon Design
• Up to 10 1WIO LED modules (available from Midon Design)
• One 1WIO Input module (available from Midon Design)
1WSwitch has the following features:
• Real-time display of state changes for DS2405, DS2406 or DS2407 sensors
• On-board voltage sensor.
• Jumper-less provisioning - all configuration settings are stored in non-volatile memory
• Up to 60 1-Wire are sensors supported
• Simple instruction set with a Help prompt for recalling command names
• Easy to delete sensors, if they are no longer required, using the DEL command
• 1-Wire bus errors are flagged when they occur
• Continuous poll for ALL sensors - 1WSwitch will notify you when any switch sensor has
changed state or is connected or disconnected, providing that they have been previously
registered by 1WSwitch via the INI command. Very useful for locating intermittent 1-Wire
bus problems or for real-time polling of contact sensors.

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• Manual Poll of sensor readings. While 1WSwitch is normally used for continuous (from 1
to 99 minute intervals) polling of sensor readings, it can also be used manually to take
sensor readings on command from the serial interface.

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1WSwitch User Guide Version 1.02 Page 6 of 28
3. Installation
To complete this project, you will need to connect a 12 to 16 Volt (AC or DC)
transformer to the terminal J1 (see Figure 2 for the location of J1). If you intend
to power 1WIO relay units from the 12V output of 1WSwitch, the transformer
needs to supply at least 350mA (250mA for 1WIO and 100mA for 1WSwitch) per
1WIO relay unit, up to a maximum of 800mA, or 2 1WIO relay units. Beyond
that, supplemental powering will need to be provided for the off-board units.
Otherwise, any 12 to 16 Volt adapter capable of at least 100mA will do.
If you are using a sensor network of 1-Wire devices, connect them now to either
connector J3 or J5.
Figure 2 Location of Connectors

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1WSwitch User Guide Version 1.02 Page 7 of 28
4. Using 1WSwitch
Connect up a straight-through serial cable between 1WSwitch'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 1WSwitch and configure the unit for
the devices that you have connected.
The start-up sequence will look like this:
1WSwitch v1.01 2008-10-12
MidonDesign.com 2245
Reset type: C2
Poll interval = 255 minutes
Serial # Display = On
Time Display = On
OnBoard ADC Display = On
Enable INP = On
Debug = On
SUN 00:00:00
>
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 register 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.
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 you believe that 1WSwitch has not found all 1-Wire devices, re-issue the INI
command.
Now program the configuration by using the SET command. Just type SET and
the program will prompt you for the required settings; polling interval, display
settings, and finally the real time clock setting.
>set
Poll interval = 01
Serial # Display = on
Time Display = off
OnBoard ADC Display = on

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1WSwitch User Guide Version 1.02 Page 8 of 28
Enable INP = off
Debug = off
Set Clock (d,h,m,s): 01,14,30,00
The options are further defined later in this manual. All are independently
adjustable without using the SET command.
To verify that your setup is working properly, you could 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).
SUN 14:30:44
Reading Sensors...
Switch #01[C90000005F31C412]=On
Switch #02[4A0000005F3A1512]=On
Switch #05[170000002A345005]=On
Switch #06[4F0000002A15C405]=On
Switch #07[A60000002A30A405]=On
Switch #08[620000002A1B9C05]=Off
Switch #09[410000002A1A3A05]=On
Switch #10[CC0000001FBD2605]=Off
Switch #11[8F0000001FB60105]=Off
Switch #12[E60000001FB82D05]=Off
Switch #13[A20000001FB6C705]=Off
Switch #14[290000005F365412]=Off
J2 Pin 3 Voltage = 00.40V
>
It is highly recommended that you next turn off (or on) all the connected switches.
This will reset the saved state in the EEPROM, which may not match the physical
configuration – the state of all switch sensors is normally preserved through a
power cycle. Use the ONA or OFA command for all DS2406’s (or DS2407) and
the TOG command for DS2405’s.
If there are no apparent errors, you are ready to use 1WSwitch. Enjoy!

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1WSwitch User Guide Version 1.02 Page 9 of 28
5. Using 1-Wire Switch Sensors
Figure 3 DS2405 or DS2406 Applications
Figure 3 shows some of the ways in which DS2405 or DS2406 1-Wire sensors
can be connected to external devices. The PIO pin on the 1-Wire device can be
used as either an input or as an output. When used as an input, make sure that
you set the 1-Wire sensor to the off state, otherwise the PIO input changes will
not be visible to the device.
When properly connected as a switch input, 1WSwitch will show state changes
whenever they occur, for example:
FRI 08:11:10
Switch #01[C90000005F31C412]=On
>
FRI 08:11:12
Switch #01[C90000005F31C412]=Off
>
FRI 08:11:17
Switch #01[C90000005F31C412]=On
Note that “On” means that the DS2405/6/7 PIO output is at ground voltage level.
Thus, in the applications shown in Figure 3, “On” would mean that switch SW1 is
closed, or LED DS1 is lit, or relay RLY1 is activated.

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1WSwitch User Guide Version 1.02 Page 10 of 28
6. 1WSwitch Commands
Table 1 1WSwitch Command List
Command Description Syntax
DAD Display on-board ADC voltage during
poll output
DAD<on|off>
Note 3
DEB Enable or disable debug outputs
Use only when directed to by Midon
Design
DEB<on|off>
DEL Delete a sensor that was previously
installed via the INI command
DEL<sensorid>
Note 1
DIS Display serial numbers of all registered
1-Wire devices
DIS
DTI Display Time every minute DTI<on|off>
EEP Display and change specific EEPROM
memory locations
EEP <start location><cr>
EIN Enable polling of 1WIO sensors for
input status
EIN<on|off>
ERA Erase the entire EEPROM ERA
HLP Display a list of available commands HLP
INI Register all connected 1-Wire sensors INI
INP Display the status of bits 4-7 of the first
connected DS2408
INP
LED Actuate a specific LED on a 1WIO LED
unit or an equivalent DS2408 LED
interface
LED <LED number> <on|off>
Where <LED number> = 01 to 80
or A for All (the leading zero is
required for LED numbers less
than 10)

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Command Description Syntax
MEM Display and change specific memory
locations
MEM <start location><cr>
ONA Turn ON a DS2406 or DS2407
(channel A only)
ONA <sensorid>
Where xx is a decimal number
corresponding to the DS2406/7
sensor number as shown in the
DIS display
OFA Turn OFF a DS2406 or DS2407
(channel A only)
OFA <sensorid>
Where <sensorid> is a decimal
number corresponding to the
DS2406/7 sensor number as
shown in the DIS display
RLY Actuate a specific 1WIO relay RLY <relay number> <on|off>
Where <relay number> = 01 to
80 or A for All (the leading zero is
required for relay numbers less
than 10)
SCK Set Clock SCK dd, hh, mm, ss<cr>
dd = 01 to 07 (Sunday = 01)
hh = 00 to 23
mm = 00 to 59
ss = 00 to 59
Note 2
SET Configure all system parameters SET
SID Show the Serial Number ID for the 1-
Wire Devices
SID <on|off>
SPT Set the polling interval in minutes SPT <xx>
Where <xx> is a decimal number
from 00 to 99. 00 will disable
polling.
TIM Display Time from the Real Time Clock TIM
TMP Display sensor readings of all
connected 1-Wire Devices in either
verbose (includes serial numbers) or
non-verbose mode
TMP
TOG TOGgle a DS2405 sensor output from TOG <sensorid>
Where <sensorid> is a decimal

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1WSwitch User Guide Version 1.02 Page 12 of 28
Command Description Syntax
on to off or from off to on number corresponding to the
DS2405 sensor number as
shown in the DIS display
VER Displays the current version of the
software loaded
VER
ZZZ Performs a soft reset of 1WSwitch ZZZ
Notes
1. The <sensorid> parameter in the commands above refers to the sensor number as
shown via the DIS command. Leading zeros are required. See the DIS command
explanation below.
2. Most commands do not require a Carriage Return (enter) following the parameter
or command input. One exception is the SCK command. Commands requiring a
sensor number input will require a CR if the sensor number is only a single digit.
3. Command parameters are shown in angled brackets “< >”. Where only certain
options are permitted, they are indicated with a vertical pipe character “|”.
6.1. Using the SET Command
The SET command has multiple parameters. All option parameters are also
adjustable via discrete commands.
>set
Poll interval = 01
Serial # Display = on
Time Display = off
OnBoard ADC Display = on
Enable INP = off
Debug = off
Set Clock (d,h,m,s): 01,14,30,00
Poll Interval
This parameter determines the time between sensor readings. Set to 00
to stop polling. Enter the time in decimal minutes. Use the SPT command to
adjust only this parameter.
Serial # Display
Set this to On if you want 1WSwitch to display the 1-wire ID of all sensors.
Use the SID command to adjust only this parameter.
Time Display
Set this to On if you want 1WSwitch to display the voltage as measured at
connector J2 pin 3. Use the DAD command to adjust only this parameter.

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1WSwitch User Guide Version 1.02 Page 13 of 28
OnBoard ADC Display
Set this to On if you want 1WSwitch to display the output from the on-
board Analog to Digital Converter connected to pin 3 of J2 and referenced to
ground on pin 4 of J2. Use the DAD command to adjust only this parameter.
Debug
Set this to On only if requested to by Midon Design in case trouble-
shooting details are required. Otherwise, your display will be corrupted with
outputs that are meaningless. Use the DEB command to adjust only this
parameter.
Set Clock
Enter the current time here as Day of week (01 = Sunday) followed by Hour,
Minutes, and lastly, Seconds. Use the SCK command to adjust the clock at any
time. Time is entered and displayed in 24 hour (military) format.
6.2. The DIS Display Output
Sample DIS Output
>dis
01 C90000005F31C412 DS2406 OK P
02 4A0000005F3A1512 DS2406 OK P
03 A400000001042829 DS2408 OK P
04 7400000001044629 DS2408 OK P
05 170000002A345005 DS2405 OK P
06 4F0000002A15C405 DS2405 OK P
07 A60000002A30A405 DS2405 OK P
08 620000002A1B9C05 DS2405 OK P
09 410000002A1A3A05 DS2405 OK P
10 CC0000001FBD2605 DS2405 OK P
11 8F0000001FB60105 DS2405 OK P
12 E60000001FB82D05 DS2405 OK P
13 A20000001FB6C705 DS2405 OK P
14 290000005F365412 DS2406 OK P
15 A0000800E93A8F10 DS1820 OK P
16 3D0000004CC69826 DS2438 OK P
Poll interval = 01 minutes
Serial # Display = On
Time Display = Off
OnBoard ADC Display = On
Enable INP = Off
Debug = Off
FRI 20:11:12
6.2.1. DIS output explanations
The DIS commands shows all sensors registered by 1WSwitch. The output
shows the memory locator for the sensor, known as the sensor ID, the sensor

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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 Por Mwill be displayed to show the connectivity of
the sensor. A Pis displayed is the sensor is present, and an Mwhen 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.

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1WSwitch User Guide Version 1.02 Page 15 of 28
FRI 08:10:41
Reading Sensors...
Switch #01[C90000005F31C412]=Off
Switch #02[4A0000005F3A1512]=On
Switch #05[170000002A345005]=Off
Switch #06[4F0000002A15C405]=On
Switch #07[A60000002A30A405]=Off
Switch #08[620000002A1B9C05]=Off
Switch #09[410000002A1A3A05]=On
Switch #10[CC0000001FBD2605]=Off
Switch #11[8F0000001FB60105]=Off
Switch #12[E60000001FB82D05]=Off
Switch #13[A20000001FB6C705]=On
Switch #14[290000005F365412]=On
J2 Pin 3 Voltage = 00.42V
Voltage #16[3D0000004CC69826]=01.89V 05.22V 01mV
>
The output starts with a time reading, followed by switch status, 1WIO input
status (if enabled by the EIN command), DS2438 voltage sensor status and on-
board ADC voltage (if enabled by the DAD command).
The first voltage reading displayed for a DS2438 voltage sensor is always the
external voltage from the DS2438 input. This is followed by the VDD voltage and
lastly by the DS2438 “current” sensor voltage, which corresponds to current
depending on what value of resistor is connected across the current terminals of
a DS2438.
Note: the time is always displayed once per minute, on the minute, except
during a polling interval or TMP display, or if disabled by the DTI Off
command. See the explanation of the DTI command.
6.5. Missing Sensor Display
1WSwitch continuously polls for the presence of all sensors that have been
registered via the INI command, in other words, for sensors that are known to
1WSwitch. If any of the sensors are detected as missing, the following display
will result:
>MON 09:52:34
Missing Sensor #06 [4F0000002A15C405]
When the sensor is re-connected, the display will look like this:
>MON 09:57:01
Restored Sensor #06 [4F0000002A15C405]

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1WSwitch User Guide Version 1.02 Page 16 of 28
Polling of sensors is done sequentially and very fast (milliseconds per sensor).
The more sensors that are equipped, however, the more time it will take for
1WSwitch to recognize a missing or re-added sensor.
6.6. Options
6.6.1. On Board ADC Display (DAD)
The DAD (Display A to D) option is to enable or disable the on-chip voltage
sensor (Analog to Digital Converter, or ADC). The command DAD on enables
the display and DAD off disables the display.
The on-board ADC is available on pin 3 of J2 and referenced to the ground pin
available as pin 4 of J2. Be careful with connections to this ADC input. Note:
you are connecting directly to the processor, and input voltages greater
than 5 volts, or less than –0.6 volts, will damage the processor pin and
possibly the processor itself.
Activating the display results in the following kind of display during a Polling
interval:
>
FRI 08:10:41
Reading Sensors...
Switch #01[C90000005F31C412]=Off
Switch #02[4A0000005F3A1512]=On
Switch #05[170000002A345005]=Off
Switch #06[4F0000002A15C405]=On
Switch #07[A60000002A30A405]=Off
Switch #08[620000002A1B9C05]=Off
Switch #09[410000002A1A3A05]=On
Switch #10[CC0000001FBD2605]=Off
Switch #11[8F0000001FB60105]=Off
Switch #12[E60000001FB82D05]=Off
Switch #13[A20000001FB6C705]=On
Switch #14[290000005F365412]=On
J2 Pin 3 Voltage = 00.42V
Voltage #16[3D0000004CC69826]=01.89V 05.22V 01mV
>
6.6.2. Once Per Minute Time Display (DTI)
The DTI (Display TIme) option is used to enable or disable the once-per-minute
time display. The command DTI on enables the regular time display.
6.6.3. Enable DS2408 Input Poll (EIN)

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1WSwitch User Guide Version 1.02 Page 17 of 28
The EIN (Enable INput) option enables or disables a regular poll of one DS2408
connected on the 1-Wire bus, the one with the lowest sensorid. Setting EIN off is
generally only required for users of MD2088 LED displays, which uses a DS2408
to drive the LED’s, since the normal poll of a DS2408 will set the high order bits
(4 to 7) of the DS2408 and corrupt the LED display for those bits. Setting EIN Off
is done to permit reading of the input ports (4 to 7) of the 1WIO sensor since
clearing those bits would normally result in false readings. This option has no
affect on the INP command and as a result, user’s with MD2088 displays will
experience corruption of their LED displays if the INP command is used. The
command EIN on will enable regular polling of the 1WIO inputs during a poll
cycle.
Table 2 EIN Settings Recommended
1WIO Used Recommended EIN Setting
MD2083 4 Relay Output Not important
MD2084 4 Input On
MD2088 8 LED Ouput Off
6.7. DS2408 Based Relay and LED Usage
1WSwitch software has the ability to actuate relay modules based on the
DS2408 port expander chip from Dallas/Maxim. One such module is the Midon
Design 1WIO.
The 1WSwitch supports up to 40 1WIO relay modules (MD2083) and the RLY
command input then actuates those relays (numbered from 01 to 80). Relay
numbers 01 to 04 are for the first connected 1WIO module, relay numbers 05 to
08 are for the second, and so on. Note that the leading zero for the relay number
is required.
The LED command works the same way as the RLY command except that there
are 8 LED’s per 1WIO acted on instead of 4 relays per 1WIO. Up to 10 1WIO
LED units are supported for a total of 80 LED’s. Remember to set EIN OFF
when using a 1WIO LED Module.
The RLYA<on|off> command will affect all connected 1WIO relays, and/or all
connected LED modules.
>rly01on
Relay Group #01=On,Off,Off,Off

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1WSwitch User Guide Version 1.02 Page 18 of 28
7. J5 Usage
J5 is an RJ-12 connector, which is equivalent to a phone connector, except that it
has 6 pins instead of just 4 (or 2). J5 is connected to the One Wire bus and can
be used for adding connectivity to One Wire busses configured for RJ-11/12
connection.
The pin-out of the J5 connector is shown in Figure 4.
Figure 4 Connector J5 RJ-12 Pin-out
Pin 1 is derived from the power supply feeding 1WSwitch. It is DC rectified, so it
will not matter if your power supply is AC only.
Please note that this pin-out may be different than that of your 1-Wire
sensors. At one time, there was no established standard pin-out for the RJ-12
wiring and, as a result, different manufacturers have chosen to use the pins in
various ways. The common pins (DQ and Ground) have remained the same for
all manufacturers, however, as of the time of writing this manual. These pins are
shown in color in the table below. Some of the published pin-outs available
today are shown in the table below. Please take caution in connecting up your 1-
Wire sensor to 1WSwitch to avoid damaging the sensor.
Table 3 RJ-12 Pin-outs in use
Device Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6
Dallas/Maxim wiring standard (published
Oct 2001) +5VDC GND DQ GND N/C DC Supply
Midon Design MD2004 TEMP05 N/C +5VDC DQ GND N/C N/C
Midon Design MD2104 1WSwitch DC
Supply +5VDC DQ GND N/C N/C
Midon Design MD2204 LOG08 DC
Supply +5VDC DQ GND N/C N/C
Midon Design MD3009 Temp Sensor N/C +5VDC DQ GND N/C N/C
Midon Design MD3020x Temp and
Humidity Sensor DC Supply +5VDC DQ GND N/C N/C

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1WSwitch User Guide Version 1.02 Page 19 of 28
Device Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6
Midon Design MD208x Relay and LED
Sensor (1WIO) DC
Supply +5VDC DQ GND N/C N/C
Simon Atkins’ Hub (shown for reference
only. 1WSwitch does not support this
device)
+5VDC DC Supply DQ GND DC Supply GND
AAG TAI8550 Combo Switch +5VDC GND DQ GND N/C N/C
AAG TAI8520 Temp Sensor +5VDC GND DQ GND N/C N/C
AAG V3 1-Wire Weather Station N/C +5VDC DQ GND GND N/C
AAG TAI8540A Humidity Sensor N/C N/C (GND?) DQ GND N/C (+5VDC?) N/C
AAG TAI8555 Latch Relay N/C GND DQ GND N/C N/C
AAG TAI8585 Counter Kit N/C N/C DQ GND N/C N/C
AAG DS9097U-S09-X N/C GND DQ GND +5V N/C
The table entries shown in red above indicate pin configurations that may
damage 1WSwitch or the connected sensor.

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1WSwitch User Guide Version 1.02 Page 20 of 28
8. Software Change History
Table 4 1WSwitch Software History
Version Date Major Changes from Previous Loads
1.02 11/17/2008
• Minor glitch in INI command
• Added “Found…” message to INI output
1.01 10/12/2008
• Final production version of software
8.1. Upgrading 1WSwitch Software
Midon Design strives to continue to add value to the 1WSwitch product and, as a
result, we release new features to the 1WSwitch software from time to time.
Upgrading 1WSwitch is easy. Software updates can be ordered from our web
pages. Upon receipt of your new chip containing the upgraded software, return
the original chip to Midon Design and cite the order number. If we receive the
device back within 30 days of the upgrade order, we will credit your PayPal
account with half the price of the upgrade, less shipping costs. Alternatively, you
can apply that credit towards a future purchase from Midon Design.
8.2. Upgrade Instructions
1. Remove power from the 1WSwitch!
2. Using a small screw-driver, or similar tool, gently remove U1, the
68HC908KX8 micro-controller, by inserting the screw-driver between the
micro-controller and the DIP socket that it is inserted to. The location of
U1 is shown in Figure 5.
3. Make sure that you are grounded, or adequately static free, and then
insert the new micro-controller into the socket. Care should be taken to
observe the correct polarity. The end of the micro-controller with a small
notch, or a dot in the left corner, should be positioned to be close to the J1
connector as per the diagram below.
4. Make sure that all micro-controller pins are seated in the socket. Check
for pins that may have bent inwards.
5. Restore power to 1WSwitch.
6. Enjoy your new features.