Controller Area Network TDS2020F


Posted on Feb 6, 2014

The Controller Area Network data rate can be from 10kbit/s to 1Mbit/s giving recommended distances of 40 to 1000metres over two twisted pairs, one for the data, the other to carry power and ground. Up to 110nodes may be connected. 2. Set the DIL switch on each board to the required node number 0to127. The actual value is unimportant, providing the


Controller Area Network TDS2020F
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y are different —we suggest 2and3. 3. Connect together two nodes, each consisting of a TDS2020CAN with either a TDS2020F or TDS9092 computer. Use a cable with two twisted pairs, connecting pins 2&7, and 3&9, having a female connector at one end and a male at the other. Leave the other two CAN connectors open. 7. Type CANTEST and return on each computer in turn. An incrementing number is transmitted which all connected and initialised nodes will receive and display. Verify that you see the message when you change the PC plug to the other node. Stop the test with any key (ctrl+C on TDS9092). 8. Type ROLLCALL and return on each computer in turn. A memory transfer is made to all of the 128 possible nodes and responding initialised node numbers are displayed. In this case, just the identity of the other node should show. Controller Area Network is a bus operating at RS485 levels, 0V and +5V in push-pull to give common mode immunity. Instead of being character based, it sends messages of up to eight bytes. Each of these frames has an identifier and any node with a matching identifier will receive the message. Each node can be either a TDS2020F+TDS2020CAN or TDS9092+TDS2020CAN combination. The number of nodes which the network can support depends on cable lengths and bit rate, but the CAN bus driver chips are specified for at least 110 nodes. The nodes are daisy-chained, the male and female CAN connectors being internally...




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