43
Figure 11: 0-20mA Wiring (Source) 3-Wire Connection
Notes
: The detectors are supplied as:
•
Isolated 0-20mA –
Sink
in wiring option 1.
•
As non-isolated 0-20mA –
Source
in wiring options 2 and 3.
•
There are no 0-20mA outputs in wiring options 4 and 5.
C
RS-485 Communication Network
C.1
RS-485 Overview
By using the RS-485 network capability of the IR3 detector and additional software, it is
possible to connect up to 32 detectors in an addressable system with four (4) wires only (2
for power and 2 for communication). Using repeaters, the number of detectors can be
much larger (32 detectors for each repeater) up to 247 on the same four (4) wires. When
using the RS-485 network, it is possible to read each detector status (FAULT,
WARNING, and ALARM) and to initiate a BIT to each detector individually.
For more details, consult Industrial Scientific .
Figure 12: RS-485 Networking
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