905U-L Wireless I/O Installation Manual
905U-L Wireless I/O
Page 37 of 40
Version 1.9
Unit specifications
This section details the specifications for each unit.
Transmitter unit
Input/output
Number
Additional information
Digital inputs
2
Dry-contact digital inputs slow-pulsed at 10Hz.
All inputs are suitable for voltage free contacts (e.g. mechanical switches)
or NPN transistor devices (e.g. electronic proximity switches).
NOTE
: PNP transistor device inputs are NOT suitable.
Status outputs
2
Separate System OK and Setpoint Status
Analog inputs
1
0-20mA differential input; 16-bit resolution, 0.1% accuracy, 10 ohm input
impedance.
Thermocouple
inputs
1
J, K or T type thermocouple with on-board cold-junction compensation.
Cold junction compensation accuracy ±1º over ambient temp range: -40º
to +70ºC.
Power supply
1
9-30 VDC 0.6 Amp CSA certified Class 2 power supply. For use in Class
1 Div 2 explosive areas, the power supply must be approved for Class 1
Div 2 use.
WARNING
: Explosion hazard - do not disconnect while circuit is live
unless area is known to be non-hazardous.
Transmitter
1
1-Watt Frequency Hopping Spread Spectrum (FHSS) Transmitter.
Frequency
902-928 MHz
Actual frequency range depends on country.
Receiver unit
Input/output
Number
Additional information
Digital outputs
3
Voltage-free contacts rated at 250 VAC, 1A, 30VDC 1A
2 for digital inputs and 1 for setpoint.
Status outputs
2
Separate System OK and communication failure output.
Analog output
1
16-bit resolution, 0.1% accuracy, single-ended source output.
Power supply
1
9-30 VDC 0.25 Amp CSA certified Class 2 power supply. For use in
Class 1 Div 2 explosive areas, the power supply must be approved for
Class 1 Div 2 use.
WARNING
: Explosion hazard - do not disconnect while circuit is live
unless area is known to be non-hazardous.
Radio receiver
1
High sensitivity FHSS UHF radio receiver.
Frequency
902-928 MHz
Actual frequency range depends on country.
Sensitivity
-110 dBm
At BER 8%.
