Last Updates: 08/09/2020

Precision Digital PDW30 Point-to-Point Wireless Process Signal Bridge


Part Number: PDW30 Category:
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    • Point-to-Point Wireless Bridge
    • Rugged, Weather-Tight Housing

    Usually ships in 2 to 4 weeks

    The Precision Digital PDW30 gives you a simple, straightforward way to get an analogue, discrete, or Modbus® signal from where you have it to where you need it. It’s a point-to-point wireless bridge packaged in a rugged, weather-tight housing that is designed to meet the demands of industrial installations.

    The PDW30 is simple to order, simple to configure, and easy to trust with your application. Guaranteed ranges assure it will work with your application or you can send it back – no questions asked. A wireless survey tool is available for those installations that require a site survey for longer distances, making it easy to verify the setup will work the first time.

    The primary unit accepts an analog, discrete, or Modbus® input and wirelessly broadcasts it to the secondary unit. The secondary unit then recreates that signal at its location. Just put the units in the field wherever you have a process signal and 24 VDC power.

    Fixed or remote antenna modules, as well as a wide range of accessories, are available, including mounting kits, antenna-related accessories, and repeaters. The antenna may be directly attached or remotely located. High gain directional antennas are also offered.

    • Signal Wire Replacement in a Rugged, Industrial Housing
    • Inputs and Outputs on Both Field Units
    • Simple to Order, Configure, & Install
    • 1.6km Line-of-Sight Outdoor, 152 Ft Indoor Range
    • Inputs: Analog (4-20 mA, 0-10 V, 0-5 V, 1-5 V), Digital, and RS-485 Modbus Communications
    • Outputs: Analog (4-20 mA), Digital, and RS-485 Modbus® Communications
    • Remote or Attached Antenna
    • Repeaters and Directional Antennas 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 Display

    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 29 for mounting space requirements.

    Signal Connector 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

    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

    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



    Digital Input / Output Terminal


    Four (4) digital connections, independently field selectable as either inputs or outputs

    Digital Input Logic High

    3 to 5Vdc, TTL logic level

    Digital Input Logic Low

    0 to 1.1 VDC

    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

    Note: A closed dry contact can be used for the digial inputs.

    RS-485 Modbus® RTU Serial Communications




    Removable screw terminal connector

    Max Distance

    3,937′ (1,200 m) max

    Baud Rate

    1200 – 57,600 bps


    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

    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


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


    Power connections are made to a two-terminal connector labelled POWER. The PDW30 is reverse polarity protected; it will not be damaged if wired backwards. Make sure that the power supply can provide between 12 and 28 VDC to the wireless device.

    Power PDW30 and 2-Wire Transmitter from Same Power Supply

    The PDW30 wireless units may be powered from the same power supply that powers the 2-wire (loop-powered) transmitter, assuming that the supply provides enough voltage for both units. To power both devices from the same supply, wire the devices to the supply as shown below.

    Signal Connector

    The analogue input may be either 4-20 mA, 0-10 V, 0-5 V, or 1-5 V. The appropriate input type must be programmed for each unit.

    4-20 mA Output Connector

    The 4-20 mA output corresponds with the analog input signal on the paired wireless device. The analog output signal is always 4-20 mA, regardless of the input type on the other wireless module.

    Digital I/O Connector

    All digital connections are referenced to ground. The primary unit digital I/O settings determine the settings of the secondary unit. (e.g. if DI of the primary is an input, DI of the secondary is an output)

    Note: Each connection may be set independently in the device settings as either an input or an output. In the diagram to the right, D4 & D3 are digital inputs and D2 is a digital output.

    PDW Manager Programming Software

    Programming with PDW Manager

    PDW Manager allows you to program the PDW30 wireless units from a PC with a USB connection. Units connect to a PC via the micro USB connection on their face, underneath the enclosure cover. Use of PDW Manager is required for programming advanced settings such as wireless encryption and analog signal calibration.

    PDW Manager can be found on the included CD or downloaded from Once the software is running, power the unit using a 12/28 VDC power supply and connect the device to the PC using the provided USB cable.

    PDW30 wireless units connect to a PC with a USB connection

    The PC will automatically install the appropriate device drivers. Once this has completed, the device will appear in the Device list at the top of the PDW Manager window. Click Connect.

    Click connect button

    The menu options displayed will vary depending on what type of unit is connected. The PDW30 primary unit will have more options than the secondary unit. The image below shows the available options on the configuration tab while the primary unit is connected.

    Click connect button

    The devices’ analog inputs and outputs can be calibrated using the Calibration tabs. The IO Testing tab allows you to perform diagnostics and testing on the units.

    Calibration – Analog Input

    Click connect button

    Calibration – 4-20mA Output

    Click connect button

    IO Testing

    Click connect button

    Device communication can be secured by enabling 128-bit AES encryption. A channel mask may also be set for interference immunity. The encryption key and channel mask may be entered on the Advanced tab.

    Once you have entered the encryption information, click Save Settings. The wireless devices must share identical encryption keys in order to communicate, so be sure to enter the same information for the second unit.

    Click connect button

    Mounting Dimensions



    This simple example demonstrates how the PDW30 may be used to wirelessly bridge an analog signal. Because the PDW30 can input and output a 4-20 mA signal, it is ideal for integration into existing 4-20 mA systems.

    Data Sheet: Predig_PDW30_0-Datasheet
    Instruction Manual: Predig_PDW30_Manual
    Quick Start Manual: Predig_PDW30_Quick_Start_Manual

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