
5-8
Installing Remote Base Controllers—RBCs SIMATIC 545/555/575 System Manual
PPX:505–6851–A/B and PPX:505–6850–A/B RBCs (continued)
Dipswitch SW2 (S2 on the –B version) is used to set RS-232/423 baud rates.
Figure 5-6 shows the location of the baud rate dipswitch on the RBC card.
Bezel
Dipswitch for
setting baud rate
1234
Backplane
connector
Off
On
Figure 5-6 RBC Dipswitch Location
Table 5-2 shows how to set the switches to select the desired baud rate.
Table 5-2 RS-232 Port Baud Rate Settings
Baud Rate Switch 1 Switch 2 Switch 3 Switch 4
19200 On (1) On (1) Off (0) On (1)
9600 On (1) On (1) On (1) On (1)
2400 Off (0) On (1) On (1) On (1)
1200 On (1) Off (0) On (1) On (1)
300 Off (0) Off (0) On (1) On (1)
NOTE: Dipswitch SW3 on the –A version is for factory use only. Do not
change the settings on this dipswitch. If the dipswitch setting is accidentally
changed, refer to Table 5-3 to reset your dipswitch to the proper setting.
Table 5-3 SW3 (Factory) Dipswitch Setting (–A Version Only)
Switch 1 Switch 2 Switch 3 Switch 4
On (1) Off (0) Off (0) Off (0)
Dipswitch Options
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