System 57 Quick Start Guide    05701-M-5026 MAN0839 Issue 1 
Transmitters powered from the 5701 Control Card require either three or four wire  
connections and the detector documentation will indicate the 0V and +24V power 
connections and the positive and negative loop connections. 
At the System 57 end of the field cable the detector wires should be connected to the S, 01, 
NS, 0V or 24V terminals on the Field Interface or Relay Card that is attached to the required 
Single Channel Display Card. The exact terminals used vary depending upon whether three 
or four wire topology is used, and the requirement for loop current source or sink 
configuration. The Schematics below detail the connections for 3 wire current sink or source 
transmitters. For other schematics (including isolated and barrier) refer to operating manual 
05701-M-5001.  
 
8.4.1 3 Wire Source Transmitter (sink card) 
 
 
NS 
S 
01 
4-20mA 
29 
+24V 
28 
27 
Transmitter 
0V 
5701 Interface Card 
Sensor Drive 
Module Link 
Positions 12, 10, 
7 & 3 
8.4.2 3 Wire Sink Transmitter (source card) 
 
NS 
S 
01 
4-20mA 
29 
+24V 
28 
27 
Transmitter 
0V 
5701 Interface Card 
Sensor Drive 
Module Link 
Positions 12, 9, 
6, 3 & 1. 
 
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