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.


  • Signal Wire Replacement in a Rugged, Industrial Housing
  • Inputs and Outputs on Both Field Units
  • Simple to Order, Configure, & Install
  • 1 Mile Line-of-Sight, 500 Ft Indoor Range
  • Inputs: Analog (4-20 mA, 0-10 V, 0-5 V, 1-5 V), Digital, and RS485 Modbus Communications
  • Outputs: Analog (4-20 mA), Digital, and RS485 Modbus® Communications
  • Remote or Attached Antenna
  • Repeaters Available
  • Flanges for Wall or Pipe Mounting
  • Software Available for Even Easier Setup
  • NEMA 4X, IP68 Enclosure



32-character dual-line alphanumeric dot matrix LCD display with backlight
(4.68mm x 2.21mm characters)

Display Orientation

Display may be mounted at 180° from default orientation

Network ID

Field selectable: 0 - 99

Programming Methods

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

Non-Volatile Memory

All programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.


500 V


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.

Tightening Torque

2.5 lb-in (0.28 Nm)

Shipping Dimensions

17" x 14" x 9" (43.2 cm x 35.6 cm x 22.9 cm) (L x W X H)

Shipping Weight

5 lbs. (2.27 kg)


3 years parts & labor

Wireless Radio


900 MHz


500 ft (152.4 m) indoor, 1 mi (1.61 km) outdoor (line-of-sight)


AES 128-bit encryption available using PDW Manager software

Interference Reduction

Frequency Hopping Spread Spectrum (FHSS)

Power Output

24 dBm (250 mW)


-101 dBm

PDW Manager Software

System Requirements

Microsoft® Windows® XP/Vista/7/8/10


USB 2.0 (Standard USB A to Micro USB B)


Configure devices one at a time

Analog Input


Field selectable: 4-20 mA, 0-10 V, 0-5 V, 1-5 V


±0.03% of calibrated span ±1 count

Temperature Drift

0.005% of calibrated span/°C max from 0 to 65°C ambient,
0.01% of calibrated span/°C max from -40 to 0°C ambient

Input Impedance

Voltage ranges: greater than 110 kΩ; Current ranges: < 220 Ω

Signal Loss

Inputs will remain off (open circuit) until wireless units are reconnected.

HART Transparency

Analog input will not interfere with existing HART communications on the wired 4-20 mA signal

Isolated 4-20 mA Transmitter Output

Output Source

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

Temperature Drift

0.4 µA/°C max from 0 to 65°C ambient, 0.8 µA/°C max from -40 to 0°C ambient

Signal Loss

mA output will become 3.2 mA after approx. 25 seconds

Output Loop Resistance

Power supply



24 VDC

10 Ω

900 Ω

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

DI Contact

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

Source Current

10 mA maximum output current

Sink Current

1.5 mA minimum input current

Signal Loss

Digital output goes to logic high

RS-485 Modbus® RTU Serial Communications




Removable screw terminal connector

Max Distance

3,937' (1,200 m) max

Baud Rate

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

Modbus Timeout

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)

Mounting Dimensions


Field Unit

The diagram below below shows the locations of screw terminal blocks on the rear of the wireless field unit assembly.


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