255 All equipment connected to a bus can simultaneously be addressed under this address.250 Range for individual equipment addresses = interface address Addr – the minimum specified response delay time (t av) has elapsed so that the host computer has time to get ready to receive data.Ģ.4 Function and value range of the format characters – it receives a valid telegram addressed to itself and Communication is in half-duplex mode.Īn equipment connected to the master becomes active (responds) only, when SPS) and as many as 255 slaves (equipment e.g. Involved is a master/slave protocol with a fixedly assigned master (e.g. When using the 1799-V5040 interface converter on the master, the following pins are connected on the Sub-D plug: A = 3 B = 8 C = 5 1.4 Principal function With longer bus lines (longer than about 5 m) the bus should be terminated at both ends with the characteristic impedance The wiring must be made from equipment to equipment and must not be a star connection. Thereby, all terminals A, B and/or C are interconnected in parallel. When using a RS-485 interface, as many as 32 equipment (R2600/01 and others) can be connected to the bus. Ĭriteria for the validity of a request telegram. įunction and value range of the format characters. Ĥ Parameter indices of the equipment parameters
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