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High-speed CAN uses a 120 Ω resistor at each end of a linear bus. Low-speed CAN uses resistors at each node. Other types of terminations may be used such as the Terminating Bias Circuit defined in ISO11783. [9] A terminating bias circuit provides power and ground in addition to the CAN signaling on a four-wire cable.
Terminating resistor values of 78.7 ohms 2 watt 1% are used on the MIL-STD-1553 bus. At the two ends of the bus, resistors connect between the positive (high) and negative (low) signal wires either in internally terminated bus couplers or external connectorized terminators.
For example, a 10 ohm resistor connected in parallel with a 5 ohm resistor and a 15 ohm resistor produces 1 / 1/10 + 1/5 + 1/15 ohms of resistance, or 30 / 11 = 2.727 ohms. A resistor network that is a combination of parallel and series connections can be broken up into smaller parts that are either one or the other.
Normally bus couplers are available with 1.4:1 transformer ratios and 59 ohm (2 watt 1%) resistors. For special applications, couplers can be supplied with different transformer ratios (e.g., 1:1) and other resistance values (e.g., 54.9 ohms). Bus coupler configurations are available as non-terminated or internally terminated.
Carbon film resistors feature a power rating range of 0.125 W to 5 W at 70 °C. Resistances available range from 1 ohm to 10 megaohm. The carbon film resistor has an operating temperature range of −55 °C to 155 °C. It has 200 to 600 volts maximum working voltage range.
The siemens (symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively; hence one siemens is equal to the reciprocal of one ohm (Ω −1) and is also referred to as the mho.
Agricultural implement ISOBUS plug. ISO 11783, known as Tractors and machinery for agriculture and forestry—Serial control and communications data network (commonly referred to as "ISOBUS") is a communication protocol for the agriculture industry based on, and harmonized with, the SAE J1939 protocol (which is based on the CAN bus).
can4linux is an open-source CAN Linux-Kernel device driver. Development started in the mid-1990s for the Philips 82C200 CAN controller stand alone chip on an ISA Board AT-CAN-MINI. In 1995 the first version was created to use the CAN bus with Linux for laboratory automation as a project of the Linux Lab Project at FU Berlin.
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