8/21/2021

Bus Waveform

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Waveform Monitors. Refine by No filters applied Browse by & Brand Hide Filters Show Filters Brand Leader (29) VIEW AS. Sort By: 1; 2; 3; Next Add to Cart. Waveform Monitor with SDI Inputs. $7,500.00 $7,125.00. CIE CHART Option for. Fondly referred to as 'The Wave', the District accomplishes it mission by providing a variety of public transportation service throughout northwest Oregon. These services include general public dial-a-ride, local deviated route, intercity and commuter bus services. Understanding the I2C Bus Figure 7. Example NACK Waveform 3 I2C Data Data must be sent and received to or from the slave devices, but the way that this is accomplished is by reading or writing to or from registers in the slave device.

1987-10-01Bus Waveform
The determination of the maximum bus cable length, distance between bus couplers, number of couplers, and length of stubs that may be used in a MIL-STD-1553B bus system application is a fundamental problem in any bus design. MIL-STD-1553B does not specify maximum bus length or maximum stub length. Only a suggested maximum stub length is given. The MIL-STD-1553 Multiplex Applications Handbook (MIL-HDBK-1553) gives very little additional guidance in this area.
Waveform distortion due to reflections at the bus couplers is the primary factor which sets the bus length and loading limits of a MIL-STD-1553B bus. Waveform distortion is investigated experimentally, explained by application of transmission line theory, and accurately predicted by a computer simulation program.
The results of tests performed on a number of different bus configurations having bus lengths up to 300 feet and up to 32 bus terminals are given. The tests include the use of 8-stub couplers on the bus as well as the usual single stub couplers. Waveform photographs are given for the various bus configurations. The test results are analyzed and compared to waveforms generated by a computer simulation of the MIL-STD-1553B buses. Practical cable length and loading limits of MIL-STD-1553B buses are formulated, based upon the experimental and theoretical results of this investigation.
DOI: https://doi.org/10.4271/872483
Citation: Briscoe, W., Davila, M., and Skinner, B., 'Bus Length and Loading Limits of MIL-STD-1553 Buses,' SAE Technical Paper 872483, 1987, https://doi.org/10.4271/872483.
Download Citation
Author(s): W. G. Briscoe, Manuel Davila, Brian Skinner
Pages: 15
Event: SAE Aerospace Avionics Equipment and Integration Conference and Exposition
e-ISSN: 2688-3627
Also in: Aerospace Avionics Equipment and Integration-Proceedings of the Second Conference-P-205
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The purpose of this test is to investigate the presence of LIN-BUS signals and circuit integrity in relation to systems connected.

How to perform the test

View connection guidance notes.

  1. Use manufacturer's data to identify the LIN-BUS circuit and connected components.
  2. Connect PicoScope Channel A into the LIN-BUS circuit and to a good earth.
  3. Minimize the help page. You will see that PicoScope has displayed an example waveform and is preset to capture your waveform.
  4. Start the scope to see live data.
  5. Operate the systems connected by the LIN-BUS to observe signal changes. Move connectors and wiring loom fixings to look for any signal drop-out.
  6. With your waveform on screen stop the scope.
  7. Use the Waveform Buffer, Zoom and Measurements tools to examine your waveform.

Note:

LIN-BUS circuit access can be gained at individually controlled components.

Example waveform

Waveform notes

As you can see from the example waveform, the LIN bus waveform is a square wave, representing the binary states in a serial data stream. The waveform observed should be free of obvious distortion and noise spikes, and the upper and lower levels should be approximately as in the example (for a 12 V system).

The lower level voltage (logic zero) should be less than 20% of battery voltage (typically 1 V) and the upper level voltage (logic one) should be more than 80% of battery voltage. Note that the voltage levels may change slightly when the engine is started.

We cannot decode the data stream using a scope, so the purpose of this test is to verify that the signal is both present and correct, and is not interrupted by moving the wiring harness or gently tugging the connectors. Faults may be specific to a particular function, such as a non-operating window, or general, where all the functions on the bus are not working. Before condemning a device, use the scope to check that it has power, ground, and a present and correct LIN signal.

Waveform Library

Go to the drop-down menu bar at the lower left corner of the Waveform Library window and select, Lin bus

Further guidance

Local Interconnect Network (LIN) bus communication is becoming more common on modern CAN Bus-equipped vehicles. It is essentially a low-speed, single-wire serial data bus (a sub-bus of the faster, more complex CAN Bus) used to control low-speed non-safety-critical housekeeping functions on the vehicle, especially windows, mirrors, locks, HVAC units, and electric seats.

The LIN bus is proving popular because of its low cost and also because it reduces the bus load of the supervising CAN network.

Disclaimer
This help topic is subject to changes without notification. The information within is carefully checked and considered to be correct. This information is an example of our investigations and findings and is not a definitive procedure. Pico Technology accepts no responsibility for inaccuracies. Each vehicle may be different and require unique testsettings.

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Can Bus Waveform

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