Rena Ayeras

Description: Rena C. Ayeras is a writer, editor and blogger with a technical background: test, development, and managing and training technicians. Recognizing the value of the guidelines, reports and articles she wrote as an engineer; she chose to focus on those contributions and moved over to technical writing, and has since branched out to marcom and blogging. BSIT. Member of IEEE.


Posts by Rena Ayeras:

What is the Most Cost-Effective Way to Monitor and Analyze USB Power Delivery?

Question from the Customer:

I have been using the Beagle USB 480 Power Protocol Analyzer, which has been perfect for measuring VBUS current and voltage, as well as capturing, filtering, and analyzing USB bus data. However, this tool isn’t suitable for my new project, which includes monitoring the delivery of higher levels of p...

How Do I Capture USB Data from Two Devices Independent of Operating Systems?


Question from the Customer:

Our developers are starting to analyze the interaction between two devices, neither of which has an operating system (OS). One device is a printer. The other device is a medical devic that monitors a hospital patient.

The monitor has an “offline” printing mode and printer drivers that enable it to i...

How Do You View a Waveform and Interpret the Details of Captured Data from a Protocol Analyzer?

Question from the Customer:

I am using the  Beagle I2C/SPI Protocol Analyzer with a PKSA for probing a temperature sensor. I have two questions about viewing and interpreting the captured data.

Question 1 - Scope Capture

Here is a temperature reading and an ID read from the PKSA and the decoded results using the Beagle I2C/SPI...

How Do I Batch API Commands for High-Speed SPI Devices?

Question from the Customer:

Can you help me use Cheetah Software API commands correctly? I am using the Cheetah SPI Host Adapter running SPI at 1 MHz. I am trying to repeatedly send the target device four bytes of data (4, 41, 0, 0), as shown in the command sequence below.

However, after adding two repeats to the queue and the fina...

When Do I Need to Add Pullup Resistors to Improve I2C Bus Tolerance?

Question from the Customer:

For my setup, the internal pull-ups of the Aardvark I2C/SPI Host Adapter will be disabled and 2.2k pull-ups will be connected from the SCL and SDA lines to a 2.7V voltage source. Here is a diagram:

Diagram of 2.2k ohm resistors : SCK and SDA lines to 2.7V .

My question – will this setup work? I am working on a system where signal voltage levels could v...

How Can I Filter Data to Only Grab the Data that Is Delivered to a Specific Endpoint?

Question from the Customer:

I am using the Beagle USB 12 Protocol Analyzer with Beagle Software API (python) to grab data. My device outputs data very quickly through Endpoint 1. However, I only need the IN data that is output by Endpoint 3, which delivers far less data.

The API example I started with is written very well, but I hav...