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| connecting_external_devices [2018/07/11 09:07] – [Connection Diagnostics] akuzmuk | connecting_external_devices [2018/07/11 09:40] – [Connection Diagnostics] akuzmuk |
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| As for the 2-wire circuit of the isolated RS-485, it is also unstable for the following reason. The system can be under parasitic induction in this case, but the current noise "general form" always eager to go back to the source, no matter where and how the chain captures interference, ie, including return through an isolated "general" scheme. This point can in turn become a source of electromagnetic interference for another part of the electronic circuit (for example, through capacitive parasitic links). A large explanation of the role of one wire is given only to save the user from the loss of valuable time for setting up communications. In addition, on long lines and at high exchange rates, it is recommended to use a matched cable (twisted pair on the screen, 120 ohm impedance) and termination resistors at the ends of the network segment. | As for the 2-wire circuit of the isolated RS-485, it is also unstable for the following reason. The system can be under parasitic induction in this case, but the current noise "general form" always eager to go back to the source, no matter where and how the chain captures interference, ie, including return through an isolated "general" scheme. This point can in turn become a source of electromagnetic interference for another part of the electronic circuit (for example, through capacitive parasitic links). A large explanation of the role of one wire is given only to save the user from the loss of valuable time for setting up communications. In addition, on long lines and at high exchange rates, it is recommended to use a matched cable (twisted pair on the screen, 120 ohm impedance) and termination resistors at the ends of the network segment. |
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| ===== Connection Diagnostics ===== | ===== Connection diagnostics ===== |
| First of all, after connecting the device and creating a connection, you can create a register in a known state, for example, the bit "always on", etc. After the register is created, its value (Value) will be displayed with the register list: | First of all, after connecting the device and creating a connection, you can create a register in a known state, for example, the bit "always on", etc. After the register is created, its value (Value) will be displayed with the register list: |
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