openPR Logo
Press release

Using PSI5 Sensor Interfaces with ADwin Real-Time Systems

07-12-2018 10:55 AM CET | Industry, Real Estate & Construction

Press release from: CAS DataLoggers

Using PSI5 Sensor Interfaces with ADwin Real-Time Systems

Introduction

The Peripheral Sensor Interface (PSI5) communications interface is a 2-wire serial communications interface found in the automotive industry. It is used in millions of vehicles to interface sensors like accelerometers to Electronic Control Units (ECU) in applications for airbag systems. Promoted by major auto suppliers such as Bosch and Continental, the PSI5 interface has been in use for more than 10 years and has shown itself to be both robust and reliable.

To minimize the number of wires going to the sensor, the physical layer of PSI5 is implemented as a 2-wire interface that carries both the signal and power. The sensor data is sent as a series of current pulses which ride on top of the normal sensor supply current. This allows the interface to communicate at up to 250K bits/second and provides EMC compatibility for conducted and radiated emissions. The standard data packet consists of 13 bits: 10 bits of data, 2 start bits and a parity bit (see Figure 1 above). The data is encoded using a Manchester coding scheme where a 0 corresponds to a rising edge in the middle of the bit transition time and a 1 by a falling edge in the middle of the bit. Typically, a dedicated receiver IC is used to read current signal and extract the data.

Implementation

A sensor manufacturer was looking for a system to simultaneously test multiple devices using this interface. Rather than try to build a custom solution around the dedicated interface chips, they were looking for an off-the-shelf data acquisition solution that could be programmed to read the raw signal and extract the data. For this project, an ADwin-Light-16 Real-Time Data Acquisition System was selected. A simple comparator circuit was used to convert the current signal to a digital waveform that could be read with standard TTL logic. The ADwin system features 6 high-speed digital inputs allowing up to 6 sensors to be read at the same time. For each digital input, a simple state machine was implemented in software to monitor the incoming data, look for the start bits, read and then decode the data.

The minimum bit time corresponding to a 0 was 40 microseconds; therefore, to allow for small variations in the timing, the state machine was setup to read the inputs at 8 times the expected clock rate, or 5 microseconds. A watchdog timer was also provided to allow the state machine to reset in the case of a partial or corrupted transmission. Figure 3 lists the ADBasic code for the state machine to read one sensor. For testing, a second ADwin system was configured to generate various data packets to verify that they could be read correctly.

For this project, it was quite straightforward to create a simple state machine using the CASE structure available in the ADBasic programming environment. Figure 3 shows a portion of the program to look for the start of a word, read and decode the datagram. The ADwin system was programmed to execute this EVENT: loop every 5 microseconds to match the standard timing of the PSI5 signal.

Benefits

The deterministic, real-time capability of the ADwin system allowed the data to be read reliably without the need for specialized receiver IC’s. The flexibility of the software enabled the different scenarios and failures mechanisms to be tested quickly and easily. By using the ADwin-Light-16, the customer was able to test 6 devices in parallel, dramatically reducing the hardware required.

For more information on ADwin Real-Time Data Acquisition and Control Systems or to find the ideal solution for your application-specific needs, contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit our website at www.DataLoggerInc.com.

Computer Aided Solutions, LLC. dba CAS DataLoggers is a distributor of data loggers, paperless recorders and data acquisition equipment.

We have the industry’s most complete selection of data logging equipment, with hundreds of different models from more than 18 manufacturers. With data loggers from 1 to 300 channels we can record temperature, humidity, force/strain, pressure, flow, voltage, current, resistance, vibration and other digital signals, in connection with serial (RS-232/RS-485), CAN/OBD or SDI-12 devices. We sell directly to end users and also work through a network of distributors and resellers throughout the United States, Canada, Central and South America.

CAS DataLoggers
8437 Mayfield Rd Unit 104
Chesterland, OH 44026

This release was published on openPR.

Permanent link to this press release:

Copy
Please set a link in the press area of your homepage to this press release on openPR. openPR disclaims liability for any content contained in this release.

You can edit or delete your press release Using PSI5 Sensor Interfaces with ADwin Real-Time Systems here

News-ID: 1121177 • Views:

More Releases from CAS DataLoggers

New AirGate 4G Cellular Router from Novus
New AirGate 4G Cellular Router from Novus
NOVUS presents AirGate 4G, an industrial VPN router for cellular networks. Data sending is secure with this new device as it uses encryption protocols and firewall systems most commonly used in IT infrastructures, including automatic fallback for 4G, 3G, and 2G cellular networks. AirGate 4G is CE Mark certified and was developed for industrial environments. It can maintain its high availability performance even in extended operation situations, being equipment suitable
New AERINOS ADS-300 from Infinite Informatics
New AERINOS ADS-300 from Infinite Informatics
New Wireless NB-IoT/LTE-M Data Collection End Node CAS DataLoggers is pleased to introduce the new AERINOS ADS-300 wireless sensor end node from Infinite Informatics. The ADS-300 is designed to transmit data via either NB-IoT/LTE-M cellular networks and is targeted at remote monitoring applications. NB-IoT is a wireless protocol designed for the Internet of Things that offers very low-power operation using either existing GSM or newer LTE cellular technology. NB-IoT is a
New TR32B Bluetooth Data Logger From TandD
New TR32B Bluetooth Data Logger From TandD
CAS DataLoggers is pleased to announce the updated TR32B log-EZ as an effective low-cost solution for temperature and humidity measurement. The log-EZ is designed as a compact, user-friendly data logger to easily measure and record ambient temperature and humidity. It provides Bluetooth communication and a smartphone/tablet app that can display and upload data to the cloud. The TR32B provides a measurement range of 0° to 50° Celsius (32° to 122°
New A2-06 Temperature & Alarming Monitoring Pod by CAS
New A2-06 Temperature & Alarming Monitoring Pod by CAS
Medical storage applications depend heavily on monitoring the temperature of their goods in cold storage to protect items such as vaccines, blood, medicine, and tissue samples. CAS DataLoggers is pleased to introduce the A2-06 Ethernet Wired Temperature Measurement Pod designed for measuring temperatures in medical refrigerators, freezers, incubators, and in cryogenic storage. The pod is an Ethernet LAN-wired temperature monitor with connections for two external RTDs and a thermocouple sensor.

All 4 Releases


More Releases for ADwin

ADwin Test System Reduces Application Development Time
Real-Time Data Acquisition and Control Test systems are used to determine the dynamic characteristics and parameters of components and sensors. In R&D, these systems acquire not only component parameters but also characteristics of prototypes and pre-production models. Component endurance is determined by testing them over thousands of test cycles. On production lines, test benches ensure a higher level of quality through either random sample or individual component testing (CAQ). Test information
Cold Atom Physics Experiments Controlled by ADwin
ADwin-Pro-II Real Time Data Acquisition & Control CAS DataLoggers provided the data acquisition and control solution for a professor of physics, specifically focusing on cold atom physics at a major university. They began running an experiment producing ultracold quantum gases containing either bosons and fermions. The experiment took place under high vacuum inside a pyrex glass cell. Researchers collected the atoms in a magneto-optical trap (MOT) which consisted of 6 laser
ADwin Systems for Automotive Test and Control
Online Real-Time System Compiles Code with Just a Mouse Click German manufacturer Jager-ADwin’s popular ADwin Pro-II Data Acquisition and Control system is designed for use in automotive test, ECU test, CANbus applications, test system integration, and more. The PRO-II utilizes an ARM-based Pro-CPU-T12 processor module to deliver the fastest real-time computing power. With the programmability of the local ADwin CPU, users can run real-time data logging and/or control programs with kHz
ADwin for Test & Control of Rotating Machines
Real-Time Data Acquisition Systems for Machine Test Stands Automotive test bench applications require real-time test and measurement to increase PQ and to lower recall rates. To achieve this, the use of data acquisition and control systems is especially common in test stand setups. In particular, product quality technicians and test system integrators who need to view accurate data from rotating/spinning parts in motors, car engines, etc. are often concerned with the
Intelligent Data Logging Using an ADwin
Data Logging with Real-Time Pre-Processing of Data ADwin Real-Time systems are ideal for intelligent data acquisition and control applications. Utilizing the programmability of the local CPU in the ADwin, users can run real-time datalogging and/or control programs with kHz execution speeds up to the MHz range. CAS DataLoggers offers these systems along with technical support-- contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit our website at www.DataLoggerInc.com. ADwin’s
Jager-ADwin Releases New Software Update
Ver. 6.00.08.01 Adds Support for MATLAB, LabVIEW CHESTERLAND, OH—June 20, 2016 Jager-ADwin has just released a new version of the ADwin CD-ROM. Version 6.00.08.01 adds more support for MATLAB and LabVIEW, improved cache management, and several minor bugfixes. ADwin data acquisition and control systems are ideal for applications in automotive test, laboratory data acquisition, product R&D and more. The new ADwin CD-ROM is ready for download at CAS DataLoggers on our ADwin