Electrical Specifications
34
SafEye
TM
Open Path Detection System User Guide
4.2
Electrical Specifications
•
Operating Voltage
: 18
–
32 VDC
Power Consumption
Detector
200 mA at 24 VDC (250 mA peak)
Source
250 mA at 24 VDC (450 mA peak)
•
Electrical input protection
:
The input circuit is protected against voltage-reversed polarity, voltage
transients, surges, and spikes according to MIL-STD-1275A.
•
Electrical Interface
(see Figure 5).
•
Electrical outputs.
4.2.1
4
–20mA Current Output
The 4
–
20mA is a source configuration. The maximum permitted load
resistance is 600ohm.
There are 2 options for 4
–
20mA:
•
Continuous reading -
default
(see Table 4)
•
Discrete reading
(see Table 5)
4.2.2
Communications Network
The detector is equipped with an RS 485-communication link that can be
used in installations with computerized controllers.
Communication is compatible with the Modbus protocol:
•
This protocol is standard and is widely used.
•
It enables continuous communication between a single standard
Modbus controller (master device) and a serial network of up to 247
detectors.
•
It enables connection between different types of SPECTREX detectors
or other Modbus devices to the same network.