ProXR Lite relay controller, Mesh modem, compatible buy

This is a follow on from previous post WiFi & XBee antennas

I’d like to confirm that this is the correct combination of devices & ask some questions. First project 4 RTUs, later projects more.

  • PR60-1_R85PL: Relay Controller 8-Channel General Purpose SPDT + 8 Channel ADC ProXR Lite
    Pluggable connectors, 5 amp SPDT

  • XBP9B-DMST-002: 900MHz (North America) Long-Range Wireless Mesh XBee-Pro® Communications Module

  • an outdoor antenna for 900MHZ such as:

  • Antenna 900 MHz Omnidirectional 3dBi w/ N-f. Optional bracket mount

  • and adapter to SMA connector on the XBee comm modules

We will convert 24VAC (HVAC standard) to 12VDC for the ProXR. We have used this before, rated at 1.5A, sufficent for our use, drive 5 relays on your board even at max 60ma/relay:

We see this modem listed on the page for the PR60-1_R85PL
- 900HP-S3B Long Range Wireless Mesh Modem with USB Interface
- we don’t understand the difference of these:
** Standard compatible with NCD Industrial Devices
** API compatible with IoT Long Range Wireless

  • it seems these are applicable to that USB modem. Is that correct?
  • We would much prefer a hard-wire ethernet modem connection to our controller for multiple reasons (not WiFi to our controller). E.g. we address the modem as an IP device, sockets or HTTP. Is this one compatible with the board?
    • PR55-17B: Industrial IoT Wireless to Ethernet Modem
    • We see this page for using it with Comm Operator. We assume that we can poll the devices (we prefer to poll, not have the device broadcast at intervals, since it is continuously powered): Receiving Wireless Sensor Data over Ethernet -
    • When we poll, are the send/response packets the same binary payload as the above document?
  • Note: we do not want to use node-red and introduce yet another layer of communication - and potential point of failure

Thank you for you clarifications and help.

Whether the modem is API enabled or not determines how software communicates over the long range wireless 900 MHz frequency to the relay controller. API refers to API communication settings on the DigiMesh wireless module. You can read more about API vs AT mode from Digi International the manufacturer of the wireless module:

You can utilize either the USB or Ethernet modem to connect to your software. The only difference is USB modem would connect to software via a virtual Serial/COM port and the Ethernet modem would connect to software via TCP socket.