Termination Switch 1 PROFIBUS DP requires termination of the bus at both end points. See the PROFIBUS DP specifications for details. Installation 1. The termination switch is not present on all cards. Page 10 SmartLinx PROFIBUS DP – INSTRUCTION MANUAL 7ML19981AQ03 Termination Setting Switch Position open (not used) off +5V 390Ω Line A 220Ω Line 390Ω GND on