4 Electrical installation RMS 621
18 Endress+Hauser
4.2.3 Output connections
The unit has two galvanically isolated outputs that can be set up as analogue outputs or
active/passive pulse outputs. In additionally there is one output available for connecting a relay and
loop power supply. The number of outputs increase if expansion cards are fitted.
Fig. 11: Output connections
Pos. 1: Pulse and current outputs (active)
Pos. 2: Passive pulse output (Open Collector)
Pos. 3: Relay output (normally open), e.g. Slot A III (Slot BIII, CIII, DIII on optional expansion card)
Pos. 4: Loop power supply output
Interface connection
• RS232 connection
The RS232 interface is connected using the interface cable delivered with the unit and the jack
plug socket on the front of the unit.
• RS485 connection
• Optional: additional RS485 interface
Terminals 103/104, this interface is only active so long as the RS232 interface is not being used.
Fig. 12: Interface connection
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