![]() This connector is found on National Instrument’s one and two port serial interfaces. The average DB9 should be able to handle 0.9A just fine, but check the datasheets to be sure. Follow The source content is published at: DE-9 (DB9) Connector The DE-9 connector is the most common serial connector. ![]() And you give up the signal ground, which could mean worse signal peformance.īy using 9 and 3 you at least ensure that you won't burn up other devices, but signal and/or EMC performance might suffer instead, depending on the quality and currents of your supply.Īnd well, obviously check the current ratings of connectors and cables. This given that you don't actually use galvanically isolated CAN or it will obviously not work. That being said, the least bad thing you can do if you do need to provide a supply through the same connector, is to do so by sacrificing pin 9 and 3. None of these were ever intended for noisy supply currents. It is required that pin 3 and optional GND on pin 6 are connected internally. ![]() CAN_V+ is dedicated for supplying opto isolators, that use the signal ground CAN_GND. The intention here is clearly that this should be a pure data traffic connector. ![]() Anyone deviating from this pin-out for CAN applications is making non-standard crap. There is an industry standard DB9 pinout for CAN which is set by CANopen DS303.1 6.1: ![]()
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