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Configure the extension as slave or master (as described here). The distinction between master and slave is an important one. When the /SS input goes low, the slave (or QScreen in this case) transfers data in response to the SCK clock input that is initiated by the master. Page 51 Input terminal board status (FD06, FE06) Input terminal board status (current status): "Communication Number FD06" Input terminal board status (status immediately before the occurrence of a trip): "Communication Number FE06" Using terminal function selection parameters, functions can be assigned individually to the termi- nals on the input terminal board. The parameters are request ID of the request, the number of the first input register and the number of input registers to be read as received by the request. My question: Is it possible to send the request bytes (which were found above) to the meter and then get the answer bytes and saved them on pc? This means, that if you have configured a frame size of X bytes, you can read exactly X bytes using the Read() function, every time the callback triggers without checking the frame count parameter. The frame size is configured with SetFrameReadableCallbackConfiguration().

The frame count parameter is the number of frames that can be read. This callback is called if at least one frame of data is readable. One key feature is its differential signaling method, which involves transmitting data using two wires with opposite voltage polarities. The foreword to the standard references The Telecommunications Systems Bulletin TSB-89 which contains application guidelines, including data signaling rate vs. RS485 meets the requirements for a truly multi-point communications network, and the standard specifies up to 32 drivers and 32 receivers on a single (2-wire) bus. A RS485 bus consists of one master and multiple slaves. The IDs have to be unique on the bus. All the other Master Bricks with RS485 Extension must not have a USB, Ethernet or WIFI connection (they can use a USB Power Supply). The Master Brick of each stack has to be the lowermost Brick (except if you are using a Power Supply). But if you are building a control system with these development boards over a distance greater than 10 to 15 meters, then you should take the noise and signal power into consideration because if you want your system to work reliably, then you cannot afford to lose the data while transferring.

If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first. The number of the first input register is called starting address for backwards compatibility reasons. It is not an address, but instead a discrete input number in the range of 1 to 65536. The prefix digit 1 (for discrete input) is omitted. If the exception code is greater than 0 then the number represents a Modbus exception code. This callback is called only in Modbus master mode when the master receives a valid response of a request to read discrete inputs. To send a response of this request use ModbusSlaveAnswerReadDiscreteInputsRequest(). Returns the response expected flag for the function specified by the function ID parameter. Sets the bootloader mode and returns the status after the requested mode change was instigated. Returns the version of the API definition implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet. To create a RS485 bus, stack the RS485 Extension on top of a Master Brick. The RS485 Extension can be positioned in the stack as you wish.

In general if you are not connected to a modem the handshaking lines can present a lot of problems if not disabled in software or accounted for in the hardware (loop-back or pulled-up). A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct. For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For getter functions it is always enabled. For callback configuration functions it is enabled by default too, but can be disabled by SetResponseExpected(). They can be called without the corresponding IP Connection object being connected. The equipment located along a set of RS-485 wires are interchangeably called nodes, stations or devices. If you are planning to replace the cable between two existing RS485 nodes, you need a way to talk to the nodes on either side, and that would still be RS485.

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