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DSATX Manual 

Copyright 2006 Mpegbox.com

 

  Page 5 of 13 

Using the 12 volt output of an ATX AC-DC power supply is also a method for successful bench testing. By 
shorting the Green Wire (PS_ON) of an ATX AC-DC power supply can provide the required current for 
certain bench testing applications. Make sure minimum load requirements (on the AC-DC power supply) 
are met if going this route. 
 
 

2.7. 

Quick Installation Steps 

 

 

Connect GND, and VIN with heavy gauge wire directly to the automotive bat and - terminals. 
GND may also be connected with heavy gauge wire to the Chassis if desired. 

 

Connect the ATX Power Connector (J7/J8) to the Motherboard and any peripherals to the Molex 
Connectors. 

 

Connect a case fan with standard 3-pin connector to J1 FAN (or assure adequate air flow). 

 

Connect the ACC line to a switched 12 volt connection in the car (or through a switch to a constant 12 
volt battery connection). This connection does not need to be heavy gauge. 

 

Connect a 2-pin jumper cable between location G at JP1 and the Motherboards "Power On" header. 
This will allow the DSATX to turn on and off the motherboard by simulating a power button press 
(POLARITY MATTERS HERE). 

 

Set P1 to set the time before shutdown. Adjustable between 0-20 minutes by default in Basic Mode. 

 

Set P2 jumper to set the low voltage cutout voltage. To minimize this feature, set it to 10 volts (fully 
counter clockwise). P2 is adjustable between 10-12 volts.  

 

Apply 12 volts to ACC by turning on the ignition or by flipping a switch and you’re ready to go! 

 

3.  User Guide 
 

3.1. 

Theory of Operation 

The basic idea of the DSATX is this: You want to put a computer in your car, but you don’t want to 

worry about turning it on and off, you don’t want to worry about the temperature extremes, and you don’t 
want to worry about the harsh automotive electrical environment. You also want to have the ability to go to 
the gas station and have the computer still running while you pump and pay so when you come back you 
don’t have to wait a boot-up. When you get home, you don’t want a dead battery. This power supply is the 
only one on the market that allows you to do all these things and have full control of the settings. 

The following example will illustrate some of the features of Basic Mode and how it applies to an 

automotive install. The DSATX is installed as described above. The user steps into the automobile and 
turns on the key. ACC goes HI (12 Volts) as a result and the DSATX wakes up from Sleep Mode. The LED 
turns on and it sends a startup pulse to the motherboard over the 2-pin jumper connected at JP1 pins G1 
and G2. The computer now boots and is up and the DSATX is in Running Mode playing Mp3s, doing GPS 
Navigation, etc. The automobile goes to the gas station and the driver turns off the key and ACC goes 
LOW. The DSATX now starts the Countdown Timer (Countdown Mode) and the LED starts flashing once 
per second. The driver gets back in the car, starts the car and the computer keeps playing the MP3s 
without a hiccup.  The DSATX now is back to Running Mode with the LED full on. The user then drives 
home and turns off the car for the night. ACC goes low and the countdown timer starts and then expires. 
The DSATX then sends a pulse again over JP1 pins G1 and G2 to shutdown the computer. The shutdown 
pulse was successful and the computer turned off. The DSATX then goes to sleep and preserves battery 
power. 
 

3.2. 

Modes of Operation 

 

Basic Mode:

 This is the factory default mode for the DSATX. In this mode the following options are 

available: 

 

P1 and P2 adjustment pots are the only adjustable settings 

 

P1 adjusts the Countdown Timer, after ACC goes low the DSATX will wait between 0-20 minutes 
(10 minutes by default, P1= 50%) 

 

P2 adjusts the Low Voltage Cutout (10-12 Volts, 11 Volts Default, P2=50%) 

 

No Serial Port Adapter is required 

 

A switch connected at JP1 pins D1,D2 (User Switch) will allow a quick shutdown 

Содержание DuraWatt DSATX 220

Страница 1: ...t Connectivity 8 4 1 Serial Port Adapters 8 4 2 Serial Port Overview 8 4 3 Basic Programming Control 8 4 4 Diagnostic Feed 8 4 5 Extended Basic Programming Examples 9 4 6 Advanced Features 10 4 7 Advanced Feature Tables 10 5 Specifications 11 5 1 Electrical 11 5 2 Mechanical 11 5 3 Connector Pin Locations 12 7 Mpegbox com Limited Warranty 13 1 Getting Started 1 1 Introduction Thank you for purchas...

Страница 2: ...ction J5 J2 J8 DC DC Power Supply 5VSB 5V 3 3V 12V PSON 12V Adjust POTs JP1 ATX 20p 12V FAN Chassis Ground GND 12 Volts In VIN Accessory In ACC Status LED MotherBoard Switch Advanced Options Communication Port Requires RS 232 or USB Translator Control Monitoring PWROK 1 4 Included Contents and Optional Accessories Included 1 DSATX 220 Watt Power Supply 1 9 20 pin ATX Power Cable with 2 HDD Power C...

Страница 3: ...MB Power Switch Computer Motherboard Hard Drive CD ROM etc 2 4 Precautions and Warnings Operating a personal computer in a motor vehicle can be dangerous Improper use or negligence can result in damage and or loss of life to self and others Safety precautions must be considered when operating a personal computer in a motor vehicle Displays must not be distracting to the driver and should not displ...

Страница 4: ...odes field upgrades and diagnostics Note Do Not Over Turn P1 and P2 only 270 degrees is available 2 6 Bench Testing The DSATX can be tested in the lab before being installed into the vehicle Certain details need to be noted for proper bench testing When connecting bench power use between 12 to 16 volts DC to Vin and Gnd terminals for best results Small jumper wires may be sufficient to turn on the...

Страница 5: ... to have the ability to go to the gas station and have the computer still running while you pump and pay so when you come back you don t have to wait a boot up When you get home you don t want a dead battery This power supply is the only one on the market that allows you to do all these things and have full control of the settings The following example will illustrate some of the features of Basic...

Страница 6: ...ate computer is on 1 blinks Main Countdown Timer 2 blinks Power Down after shutdown pulse is sent 3 blinks N A 4 blinks Over or Under Temperature Condition Are you using a fan 5 blinks Power Supply Overload or Fault ACC must go low to clear a fault 3 4 Basic Mode Timing Diagram Accessory J5 Engine Running 5V Standby MB Power Switch JP1 Computer On t2 t3 t1 User Switch JP1 Sleep Running Count Down ...

Страница 7: ... fail for any reason When rails are shorted for example 5 volts to 12 volts other power supplies on the market will not detect an over voltage condition which will damage 5 volt rated computer components 3 5 6 Output Current Limiting The output rails of the DSATX are designed to current limit such that they will begin to sag before the components are overloaded beyond their manufacturer rating in ...

Страница 8: ...ke HyperTerminal or TeraTerm are examples of applications that can be used to interface with the DSATX s Extended Basic and Advanced Modes The USB adapter creates a virtual COMM Port 4 3 Basic Programming Control The DSATX responds to the following commands over the serial interface Case Sensitive E Enable Writing Parameters Allows the below commands to work P Enter Program Mode D Load Factory Def...

Страница 9: ...s you can set with the P1 Pot Basically if you set the pot half way and had Maxtimer1 set to 1200 it would shutdown in 600 seconds If you set the Maxtimer1 to 0060 you would have between 0 and 60 seconds to select with the P1 Pot You must type 4 numbers Ex 0123 E ß Type the letter E Enable Writing y n y ß Type the letter y P ß Type the letter P PROGRAM MODE Use POTs y n y ß Type the letter y MAXTI...

Страница 10: ...ld Y ENABLESLEEP 13 1 1 yes 0 no If set Unit Will go use Sleep Mode ACC High for Wake Up FEEDON 14 1 1 yes 0 no If set Serial Port Diagnostic Status Feed is Enabled VTURNON 15 0 1 yes 0 no If set Mb Switch Press occurs after Vin is above VINHIGHTHRESH Y ACCTIMEVAL 16 0050 10ms Settling time for the ACC input Debouncing time TEMPHIGH 17 0550 0 1 deg C Maximum Operating Temperature TEMPLOW 18 0100 0...

Страница 11: ...C Input Threshold Low 4V High 7V 30V Max ACC Input Impedance 100k Ohms MB Power Switch Output Drive Open Collector 50mA Max AUX Output Drive Open Collector 50mA Max User Switch Pull Up Drive 10k Ohms to 5V Serial Port Rx Tx Low 0 7V High 2V 5V Max Supervisor Specifications Basic Mode P1 Countdown Timer Range 0 20 minutes 10 minutes default P2 Low Voltage Cutout Range 10 12 volts 11 volts default O...

Страница 12: ... 5V GND 3 3V 3 3V 5V 5V N A GND GND GND GND 12V PSON J8 ATX12V J7 ATX PWR ACC VIN GND J5 INPUT PWR 12 N C GND GND TX OUT 5VD RX IN J1 FAN J2 COMM RESET GND GND GND GND GND GND G MB_SW F AUX_SW E SL_SEN D USER_SW C USER1 B USER0 A 5VD JP1 3 3V P1 P2 POTS More Time Higher Voltage P1 P2 F1 Fuse 20 Amp Mini Auto D8 LED GND ...

Страница 13: ... other consumable parts transportation costs or any damage incurred in transit This warranty will become void if the serial number identification has be wholly or partially removed or altered Repair ore replacement under the terms and conditions of this warranty does not extent the term of this warranty Any modification of the temperature control system parameters or modifications to the mechanica...

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