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WAGO-I/O-SYSTEM 750 Function Description 35750-652 Serial Interface RS-232 / RS-485Manual1.2.05.1.4 RS-485 Operating ModeThe RS-485 operating mode in half-duplex is realized in a 2-wire multi-endpoint(bus) connection. Simultaneous transmission and receiving is not possible with2-wire connections. The I/O module switches to receive mode after transmittingthe content of the input buffer to the serial interface completely.The the "RS-485 switching time" parameter can be used to configure the timeframe when the I/O module should switch after transmitting the last character canbe configured.Possible settings are:• 100 μs (default setting)• Duration of the transfer of two characters with the current configuration• Duration of the transfer of four characters at the current configuration5.1.5 RS-422 Operating ModeThe RS-422 operating mode in full-duplex is realized in a 4-wire point-to-pointconnection. Simultaneous transmission and receiving is thus possible.In this mode, the I/O module supports flow control for the serial interface usingthe XON/XOFF protocol (see chapter "Flow Control Using XON-/XOFFProtocol").5.1.6 DMX Operating ModeThe DMX operating mode is also available with firmware version 03 or higher.In this mode, the I/O module functions as a DMX sender and allows up to 31nodes to be connected.The transmission channel is based on RS-485 physics with a transmission rate of250 kBaud, as well as 1 start and 2 stop bits. In this mode, no further settings arepossible.The structure of the transmitted telegram corresponds to the DMX 512/1990 (DIN96530-2) specification.The I/O module can transmit up to 255 bytes of data in this mode. Everytransmission of a DMX telegram begins with the transmission of the DMX startbyte. DMX channels 1 to 254 can be operated.The possible refresh rate of DMX data depends on the number of channelsoperated. By limiting the maximum channel number to 5, 21 or 45 (at a setprocess image size of the I/O module of 8, 24 or 48 bytes), refresh rates of up to200, 125 or 80 Hz are possible (see chapter "DMX Application Example").Pos : 70.3 /All e Seri en ( Allgemei ne Module)/Ü bers chriften für alle SerienBetriebs art D atenaustausch - Übersc hrift 2 @ 15\mod_1365153916751_21.doc x @ 116643 @ 2 @ 1 |
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