Pin assignment
The following table shows the pin assignment of the RJ-11 plug and the D sub female
connector:
Figure 7-2 RJ-11 jack (schematic)
RJ-11 plug D-sub 9-pin, female
Pin Assignment Pin Assignment
1 n. c. 1 n. c.
2 n. c. 2 RD (Receive Data)
3 TD (Transmit Data) 3 TD (Transmit Data)
4 SG (Signal Ground) 4 n. c.
5 RD (Receive Data) 5 SG (Signal Ground)
6 n. c. 6 n. c.
7 n. c.
8 n. c.
9 n. c.
7.4 The SET / SELECT button
The SET/SELECT button is located on the top of the housing of devices of the X-300 EEC
series. On all other devices, this button is on the front panel of the housing beside the LED
display. The SET/SELECT button has several functions that are described below.
Change the display mode
By pressing the button briefly, you change to the display mode of the LED display. For more
detailed information on this topic, refer to the section "LED display".
Configuration, displays and display elements
7.4 The SET / SELECT button
SCALANCE X-300
Operating Instructions, 11/2019, A5E01113043-24 145
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