Rs-485 Operating Mode; Rs-422 Operating Mode; Dmx Operating Mode - WAGO 750 Series Manual

WAGO-I/O-SYSTEM 750
750-652 Serial Interface RS-232 / RS-485
5.1.4

RS-485 Operating Mode

The RS-485 operating mode in half-duplex is realized in a 2-wire multi-endpoint
(bus) connection. Simultaneous transmission and receiving is not possible with
2-wire connections. The I/O module switches to receive mode after transmitting
the content of the input buffer to the serial interface completely.
The the "RS-485 switching time" parameter can be used to configure the time
frame when the I/O module should switch after transmitting the last character can
be 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 configuration
5.1.5

RS-422 Operating Mode

The RS-422 operating mode in full-duplex is realized in a 4-wire point-to-point
connection. Simultaneous transmission and receiving is thus possible.
In this mode, the I/O module supports flow control for the serial interface using
the XON/XOFF protocol (see chapter "Flow Control Using XON-/XOFF
Protocol").
5.1.6

DMX Operating Mode

The 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 31
nodes to be connected.
The transmission channel is based on RS-485 physics with a transmission rate of
250 kBaud, as well as 1 start and 2 stop bits. In this mode, no further settings are
possible.
The structure of the transmitted telegram corresponds to the DMX 512/1990 (DIN
96530-2) specification.
The I/O module can transmit up to 255 bytes of data in this mode. Every
transmission of a DMX telegram begins with the transmission of the DMX start
byte. DMX channels 1 to 254 can be operated.
The possible refresh rate of DMX data depends on the number of channels
operated. By limiting the maximum channel number to 5, 21 or 45 (at a set
process image size of the I/O module of 8, 24 or 48 bytes), refresh rates of up to
200, 125 or 80 Hz are possible (see chapter "DMX Application Example").
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Manual
1.2.0
Function Description 35