Micro Technic PV-5127A user manual ATX on/off state machine, Softoff state machine

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Users Manual & Installation Guide

PV- 5127: Power supply module with UPS

The ATX on/off state machine

The ATX on/off state machine has two states: ATX_OFF and ATX_ON. Only in the ATX_ON state can the 5V+12V outputs be turned on.

The state machine is controlled by the PS_ON input (located in the CN10 connector), and the system temperature status. PS_ON is active low – it is active when pulled low to 0V, and inactive when high or left floating.

•The state machine starts up in ATX_OFF when the main DC/DC converter starts.

•It changes to ATX_ON when PS_ON is active and the system temperature is OK (cool or warm). This means that the CPU cannot turn itself on when the temperature is not OK (too cold or too hot).

•It stays in ATX_ON as long as PS_ON is active. Even if the system temperature becomes too cold or too hot, it stays in ATX_ON, as long as PS_ON is active. This means that the CPU won’t suddenly be turned off if the temperature becomes bad (but it can decide to do a controlled shutdown and power off when it sees the temperature status).

•When PS_ON goes inactive, it changes to ATX_OFF.

If your CPU cannot control the PS_ON input, you can make it permanently active by placing a jumper in CN10.

The Softoff state machine

The Softoff state machine is intended for use with UPS monitoring software, such as the Windows 2000/XP UPS service. The Softoff state machine is controlled by the RS232 Shutdown (DTR) signal, the system temperature status, and software commands through the PC/104 bus. This state machine is useful when your CPU does not support the PS_ON signal. With this state machine, you can perform a shutdown using an RS232 handshake signal (see the section RS232), and through a software command through the PC/104 bus (see the section PC/104 Interface). If you leave the RS232 DTR unconnected, it is by default inactive.

The state machine has four states: SOFT_ON, SOFT_DELAY, SOFT_OFF and

SOFT_TEMPBAD. SOFT_ON and SOFT_DELAY are the “on” states, i.e. only in these states can the 5V+12V be turned on. SOFT_OFF and SOFT_TEMPBAD are the “off” states, where the 5V+12V is guaranteed to be off.

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Contents Micronix PC/104 Power Supply Table of contents PV- 5127 Power supply module with UPS Revision number Reason for change Date Revision historyModel no Description AccessoriesGeneral information Ordering codesDescription Block DiagramPV- 5127 Power supply module with UPS Connectors LED name Pin no Function Heater and fan control and external LEDs connector CN2Mode LED color Function RS232 connector CN3Pinheader ST3 ATX connector CN10Ext. sensor connector J2 Batt. sensor connector J1PC/104 bus connector CN1 Warm System temperatureToo cold CoolPV- 5127 Power supply module with UPS UPS Control Pson signalPin Function RS232PV-5127 CN3 When the system is too hot Mains failure Battery low StatusStatus port 251h, read only 0000bmss PC/104 interfaceAddress Read/write Function Signature port 250h, read onlyShutdown port 254h, read/write Batstatus port 252h, read only nn0cctvvRS232STATUS port 253h, read only uuuu0000 Software compatibility SoftoffLead-acid charger Battery monitor and chargerBattery voltages ST1 installedBattery LED Meaning Installed on J1 Charger function5V+12V outputs ATX and Softoff state machinesMain DC/DC converter and 5V STB Softoff state machine ATX on/off state machineIt can be illustrated like this Output Voltage Technical dataOutput power Input voltageEnvironmental specifications Mechanical layout Settings and connections Installation guidePrecautions to ESD Connection number in KL3 Function Connection in KL2 FunctionUinV TcapC Tamb max.C PoutW Thermal considerationsDifferences between PV-5127 and PV-5127A Block diagram of the PV-5127A

PV-5127A, PV-5127 specifications

The Micro Technic PV-5127 and PV-5127A models represent a significant achievement in the field of precision measurement instruments, specifically designed to enhance efficiency and accuracy in various industrial and scientific applications. These devices are characterized by their robust construction, user-friendly interface, and advanced technological features that cater to the needs of professionals.

One of the standout features of both the PV-5127 and PV-5127A is their high-resolution digital display, which provides clear readouts of measurements, ensuring that users can easily interpret data in real time. The devices boast a wide measurement range, allowing them to perform accurate readings across various parameters, including voltage, current, and resistance. This versatility makes them ideal for use in labs, research facilities, and fieldwork.

The PV-5127 and PV-5127A incorporate advanced microprocessor technology, ensuring precise measurements and quick response times. This technology enhances the instrument's ability to perform complex calculations, making it suitable for various applications, including electronics testing, industrial maintenance, and educational purposes.

Both models feature intuitive controls, enabling users to navigate functions effortlessly. The user interface is designed for simplicity, minimizing the learning curve for new users while empowering seasoned professionals to utilize the instruments to their full potential. Additionally, the PV-5127A includes enhanced features such as data logging and connectivity options, allowing users to transfer data to computers or other devices for further analysis.

Durability is another notable characteristic of these models. Constructed to withstand harsh working conditions, the PV-5127 and PV-5127A are built with high-quality materials that protect against impacts and environmental factors, ensuring longevity and reliability.

Power efficiency is also a critical aspect, as both models offer low power consumption without compromising performance. This feature is particularly important for users who rely on portable devices for extended periods.

In summary, the Micro Technic PV-5127 and PV-5127A models are sophisticated measurement instruments that combine advanced technology with user-friendly design. Their versatility, durability, and efficiency make them valuable tools for professionals across various fields, enhancing productivity and accuracy in measurement tasks. Whether in a laboratory setting or an industrial environment, these devices stand out as reliable companions for precise measurements.
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