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resources:eval:ezlinx:isolated-rs485-rs422 [28 May 2012 12:49] – Approved Hein Maraisresources:eval:ezlinx:isolated-rs485-rs422 [03 Jan 2021 22:04] – fix links Robin Getz
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 ====== ezLINX™ Isolated RS-485 / RS-422 Implementation====== ====== ezLINX™ Isolated RS-485 / RS-422 Implementation======
  
-The Isolated RS-485 and RS-422 port is implemented using the [[http://www.analog.com/ADM2587E|ADM2587E]] Signal and Power isolated CAN transceiver. The [[http://www.analog.com/ADM2587E|ADM2587E]] connects to UART2 of the ADSP-BF548 and is capable of functioning at data rates of up to 500kbit/s. Figure 1 below shows a circuit diagram of the implementation of the [[http://www.analog.com/ADM2587E|ADM2587E]] on the //ez//LINX hardware.+The Isolated RS-485 and RS-422 port is implemented using the [[adi>ADM2587E|ADM2587E]] Signal and Power isolated CAN transceiver. The [[adi>ADM2587E|ADM2587E]] connects to UART2 of the ADSP-BF548 and is capable of functioning at data rates of up to 500kbit/s. Figure 1 below shows a circuit diagram of the implementation of the [[adi>ADM2587E|ADM2587E]] on the //ez//LINX hardware.
  
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-The RS-485 Node can be configured using jumpers JP3, JP4, JP19 and JP40. To configure the node as a half-duplex RS-485 node, connect JP3 and JP4. When JP3 is fitted, it will connect B to Z, and when JP4 is fitted it will connect A to Y. When JP3 and JP4 are removed, the node will be configured as a full duplex RS-485 node or as an RS-422 node. When JP19 is fitted, the A and B pins will be terminated with 120Ω. If termination is not required, remove JP19. When JP40 is connected a pull-up resistor on the RxD pin of 10kΩ will be connected. This jumper should be connected when using the [[http://www.analog.com/ADM2587E|ADM2587E]] in half-duplex mode. The relevant jumper configurations are shown below. A list of jumper configurations for all the interfaces on //ez//LINX can be found [[resources/eval/ezlinx/config|here]].+The RS-485 Node can be configured using jumpers JP3, JP4, JP19 and JP40. To configure the node as a half-duplex RS-485 node, connect JP3 and JP4. When JP3 is fitted, it will connect B to Z, and when JP4 is fitted it will connect A to Y. When JP3 and JP4 are removed, the node will be configured as a full duplex RS-485 node or as an RS-422 node. When JP19 is fitted, the A and B pins will be terminated with 120Ω. If termination is not required, remove JP19. When JP40 is connected a pull-up resistor on the RxD pin of 10kΩ will be connected. This jumper should be connected when using the [[adi>ADM2587E|ADM2587E]] in half-duplex mode. The relevant jumper configurations are shown below. A list of jumper configurations for all the interfaces on //ez//LINX can be found [[resources/eval/ezlinx/config|here]].
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 |      ^  Full-Duplex  ^  Half-Duplex  ^  120Ω termination  | |      ^  Full-Duplex  ^  Half-Duplex  ^  120Ω termination  |
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 ^  JP40  |  N / A  |  Connected  |  N / A  | ^  JP40  |  N / A  |  Connected  |  N / A  |
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-The 3.3V supply is connected to VCC (pin 2 and 8) to power the //iso//Power isolated Power supply and //i//Coupler signal isolation of the [[http://www.analog.com/ADM2587E|ADM2587E]]. This generates an isolated 3.3V on the Visoout pin (pin 12) of the [[http://www.analog.com/ADM2587E|ADM2587E]] and is connected to the Visoin pin (pin 19).+The 3.3V supply is connected to VCC (pin 2 and 8) to power the //iso//Power isolated Power supply and //i//Coupler signal isolation of the [[adi>ADM2587E|ADM2587E]]. This generates an isolated 3.3V on the Visoout pin (pin 12) of the [[adi>ADM2587E|ADM2587E]] and is connected to the Visoin pin (pin 19).
  
 A six pin screw terminal connector, J7 is used for easy access to the A(Pin 2), B(Pin 3), Z(Pin 4), Y(Pin 5) and RS-485_ISO_GND(Pin 1 and 6) connections. A six pin screw terminal connector, J7 is used for easy access to the A(Pin 2), B(Pin 3), Z(Pin 4), Y(Pin 5) and RS-485_ISO_GND(Pin 1 and 6) connections.
  
-Application note [[http://www.analog.com/static/imported-files/application_notes/AN-960.pdf|AN-960]] provides more information on circuit implementation of RS-485 and RS-422 applications.+Application note [[adi>static/imported-files/application_notes/AN-960.pdf|AN-960]] provides more information on circuit implementation of RS-485 and RS-422 applications.
resources/eval/ezlinx/isolated-rs485-rs422.txt · Last modified: 14 Apr 2021 23:36 by Neil Quinn

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