Tucson T-238 Скачать руководство пользователя страница 9

 

T-238 Assembly Manual 

Rev. 1 February 2001 

Page 9 of 11 

 

If you haven’t already done so… 

[  ] Assemble the 1-Wire™ Weather Sensor using the 
instructions that came with the unit.   

[  ] Confirm that the Weather Sensor is operational with 
the PC software that came with the unit. 

[  ] Weather station sensor unit works with PC software 

 
[  ] Remove power from the T238. 
 
[  ] Plug in the supplied telephone cable into J2 and in the 
weather sensor unit.  A good approach here is to mount 
the 1-Wire weather station sensor unit to a bench with a C-
clamp, aligning the aluminum square tube in the same 
orientation that it will have when the weather sensor unit is 
permanently mounted outside.   
 
[  ] Apply power to the T238.  The LCD should display its 
opening messages.  If the LCD says that the 1-Wire bus is 
shorted then most likely the 1-Wire bus has been reversed.  
This will not cause any damage, but the unit will not work.  
Some telephone cables reverse the wires and some do 
not.  In addition, some telephone cord couplers reverse the 

wires.  Find a telephone cable that does not reverse the 
wiring.   
 
Hold the connectors side-by-side and oriented the same 
direction (for example, the clip tab down on both 
connectors).  Observing the red and green wires inside.  If, 
for example, red is on the left in both connectors, then this 
cable does not reverse the signal wires. 
 
When the weather sensor is connected properly, the LCD 
will not give any bus error messages.  It will complain that it 
has no IDs and will ask that your run setup.  This is 
perfectly normal. 
  
[  ] No bus error messages at all when powering up the 
weather station. 
 

Congratulations! 

You have completed the power-up and initial testing phase!  
To learn how to setup and operate your T238 APRS™ 1-
Wire™ Weather Station, please refer to the T238 
Operations Manual.  It is available on the T-238 web site at 
http://www.beals5.com/wx or 
http://www.tapr.org/taprf/html/Ft238.html 
 

 

Содержание T-238

Страница 1: ...tended for use with the Dallas Semiconductor 1 Wire bus and any device that needs a serial connection Four push button switches and a Liquid Crystal Display LCD provide the user interface The initial application for the T 238 is a controller that accepts data from a Dallas Semiconductor weather sensor unit processes it and formats it for sending either directly to a Terminal Node Controller TNC fo...

Страница 2: ...tor 1 2 w 5 Carbon Film 1 4 7 Ω yellow violet gold R13 Resistor Trimpot 1 10K Ω Trimpot 103 V1 Capacitors Capacitors may be marked in various ways The typical markings are listed but may vary Find all that match and the remaining ones if any should become apparent by elimination Mylar or Monolithic 5 0 1 uf 104 C3 C7 Electrolytic or Tantalum 5 1uF 105 or 1 35 C8 C12 2 10 uf C1 C2 Diodes 2 1N4148 S...

Страница 3: ...ayout diagram for clarification of parts placement All references to up down left and right assume that you are looking at the PCB with the text right side up that is the four switches are at the bottom and the five big connectors are at the top Resistors Resistors have a lead spacing of 0 4 and should lie flat on the PC board You may wish to use a lead former to pre form the resistor leads for ne...

Страница 4: ...oldered connections or cold gray and or grainy looking solder connections OK so far This completes the IC socket installation Capacitors All capacitors should be mounted as nearly flush to the board surface as practical without stressing the leads Install the following capacitors C3 0 1 uF 104 C4 0 1 uF 104 C5 0 1 uF 104 C6 0 1 uF 104 C7 0 1 uF 104 Solder and clip the leads 10 total Electrolytic a...

Страница 5: ...arked on the PCB with a square pad Pin 1 on the crystal oscillator is marked with a black dot and or an edge of the can that is square instead of rounded CAUTION Make certain that the U1 metal housing does not short to nearby R10 or R12 U1 32 000 MHz U2 9 8304 MHz Solder and clip the leads 8 total Connectors Gently rock the RJ 11 connector until it snaps into place and solder the leads J2 RJ 11 co...

Страница 6: ...x16 pin male header with pins facing to the rear of the LCD module and in holes 1 through 16 NOTE J8 on the PCB is an alternate connection for powering the LED backlight on the LCD There will be a red and black wire a polarized Molex plug housing and two pins remaining These are for LCD displays that do not have a 16 pin header but rather a 14 pin header Pins 15 and 16 supply power to the LED back...

Страница 7: ...as components heating up smoke or smell Remove power immediately if anything unusual appears Place the ground lead of your voltmeter on pin 2 of U3 This will be the ground reference for the rest of the measurements Measure the voltage on the voltage regulator U5 on the pin furthest from the power jack It should be between 8 and 14V If it is 0V then L1 is likely missing or damaged If it is low the ...

Страница 8: ...t U4 Pin 2 Greater than 8V Check IC socket C8 C9 C10 C11 U4 Pin 6 Less than 8V Check IC socket C8 C9 C10 C11 Remove power from the T238 Locate the flat ribbon cable Notice that one of the leads nearest one of the edges is a bluish color compared to the rest This lead denotes pin 1 You may wish to place another indication of pin 1 such as a sticker on the connectors WARNING Polarity of the flat rib...

Страница 9: ... not cause any damage but the unit will not work Some telephone cables reverse the wires and some do not In addition some telephone cord couplers reverse the wires Find a telephone cable that does not reverse the wiring Hold the connectors side by side and oriented the same direction for example the clip tab down on both connectors Observing the red and green wires inside If for example red is on ...

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