Product Type: Point-to-Multipoint Wireless Process Signal Field Unit
Input: Current (4-20 mA), Voltage (0-10 V), Modbus, Switch
Output Options: 4-20 mA Output
Power: 12-28 VDC
Serial Comms: RS-485 Modbus
Accessory To: PDW90, PDW90-BA
Warranty: 3 years
Digital Inputs: (4) Digital Inputs
Product Series: PDW
Product Family: PDW90-FN
Product category: Industrial Wireless
Product Application: Wireless Bridge
Precision Digital PDW90-FNLast Updated: 19/10/2018
Usually ships in 2 to 4 weeks
PDW90 field units transmit analog, digital, and Modbus® inputs from any location in the field to the PDW90 base station. Just set the network ID and Modbus address and put the field unit wherever there is a 24 VDC power and a process signal. Once it has been connected to the base station, it will transmit all signal connections wirelessly.
32-character dual-line alphanumeric dot matrix LCD display with backlight
Display may be mounted at 180° from default orientation
Field selectable: 0 – 99
Four programming buttons (behind glass) or PC with PDW Manager software.
All inputs and outputs are calibrated at the factory. Recalibration is recommended at least every 12 months.
Process/ Digital I/O
Press the display button once to display the present analog input and output, press the display button again to display digital I/O states.
A programmable password restricts modification of programmed settings.
12-28 VDC, 5 W max
All programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.
Operating temperature range: -40 to 65°C (display inoperable < -20 °C); Storage temperature range: -40 to 85°C; Relative humidity: 0 to 90% non-condensing
Removable screw terminal blocks accept 16 to 30 AWG wire.
Cast aluminum with glass window, 0.30% max copper content, corrosion resistant powder coating, color: blue. NEMA 4X/IP68. Two ½” NPT threaded conduit openings. One ½” NPT stainless steel conduit plug with 10 mm hex key fitting installed.
May be mounted directly to conduit. Two mounting holes for 1.5″ pipe or wall mounting. See Mounting Dimensions on page 15 for mounting space requirements.
2.5 lb-in (0.28 Nm)
17″ x 14″ x 9″ (43.2 cm x 35.6 cm x 22.9 cm) (L x W X H)
5 lbs. (2.27 kg)
3 years parts & labor
500 ft (152.4 m) indoor, 1 mi (1.61 km) outdoor (line-of-sight)
AES 128-bit encryption available using PDW Manager software
Frequency Hopping Spread Spectrum (FHSS)
24 dBm (250 mW)
PDW Manager Software
Microsoft® Windows® XP/Vista/7/8/10
USB 2.0 (Standard USB A to Micro USB B)
Configure devices one at a time
Field selectable: 4-20 mA, 0-10 V, 0-5 V, 1-5 V
±0.03% of calibrated span ±1 count
0.005% of calibrated span/°C max from 0 to 65°C ambient,
Voltage ranges: greater than 110 kΩ; Current ranges: < 220 Ω
Inputs will remain off (open circuit) until wireless units are reconnected.
Analog input will not interfere with existing HART communications on the wired 4-20 mA signal
Isolated 4-20 mA Transmitter Output
Analog input from connected wireless unit
Factory calibrated: 4.000 to 20.000 = 4-20 mA output
± 0.1% of span ± 0.004 mA
Loop Power Supply
Internally powered; no external supply needed
0.4 µA/°C max from 0 to 65°C ambient, 0.8 µA/°C max from -40 to 0°C ambient
mA output will become 3.2 mA after approx. 25 seconds
Output Loop Resistance
Digital Input / Output Terminal
Four (4) digital connections, independently field selectable as either inputs or outputs
Digital Input Logic High
3 to 5 VDC
Digital Input Logic Low
0 to 1.1 VDC
Dry contact to ground can be used to activate the input
Digital Output Logic High
3 to 5 VDC
Digital Output Logic Low
0 to 0.4 VDC
10 mA maximum output current
1.5 mA minimum input current
Digital output goes to logic high
RS-485 Modbus® RTU Serial Communications
Removable screw terminal connector
3,937′ (1,200 m) max
1200 – 57,600 bps
Transmit Time Delay
Programmable between 0 and 199 ms
8 bit (1 start bit, 1 or 2 stop bits)
Even, Odd, or None with 2 stop bits
0.5, 1, 2, 3, 4, 5 seconds; user selectable
The diagram below shows a typical PDW90 installation. Multiple transmitters are outputting analog signals to wireless field units. The analog signals are being wirelessly broadcasted to the PDW90 base station which then sends 4-20 mA signals to the destination devices.
Range: 500 ft (152.4 m) indoor, 1 mile (1.6 km) outdoor/line-of-sight)
The diagram below below shows the locations of screw terminal blocks on the rear of the wireless field unit assembly.