I just received the RS 232 Modem and a 0-10V Receiver sensor. The only documentation I’m finding online is for an older version of the modem, and perhaps the factory thought they sent out that version because they included a db9 cable when the modem I ordered has terminal connections for comms (no db9 port).
Is there any up-to-date setup documentation for the black version of the RS232 Modem with terminal connections? I’ve tried to connect to the modem using Alpha Station, but I’m getting no comms using both DTE and DCE connections (via an RS232-USB converter since the PC I’m using has no serial port). Using 115.2k and 8N1, but no comms to the modem. Any advice is appeciated.
And I should add that I’ve connected the modem to the PC and pulled up a terminal session expecting to see the raw hex packets come through, as online documentation has indicated would be the case, but still no comms there. I’ve also tried to connect to the modem using XCTU, but no comms. And I’ve tried both of those approaches again using a different PC with a native serial port (ruling out the serial/USB converter I was using before), and still no change. Lastly, I’ve tried to communicate with the modem via a PLC automation controller, but still no comms.
Still nothing. Is there no documentation for this modem? The only documents I’m finding online say that default baud is 115.2, but that’s for the white modem with the db9 connections (link).
I’ve referenced the modem section of this document link, and downloaded FTDI drivers based on guidance from this document link. My COM port comes up fine in Device Manager, but neither AlphaStation nor XCTU can see the modem.
Does the modem need to be in config mode? If so, what’s the behavior of the LEDs? If I press Reset and then Config within 1 second and hold Config down for more than 15s, there is no indication that I’ve entered config mode. What’s the process for a factory reset?
Yes sorry, I did already try 9600. We don’t use Zoom, just Skype or Webex. But the modem is being tested–and would be deployed on–a private, closed network with no access to the web, so I won’t be able to share the screen that I’m testing it on. If you have specific screens you want me to screenshot then I can upload them here. Or if you have a set of troubleshooting steps that would be helpful also.
Drawing1.pdf (131.0 KB)
Attached is some relevant screenshots of the COM port settings, and a wiring diagram of the connections I’m using. I’ve used Putty and TeraTerm with 9600 and 115200, but also AlphaStation where I always get the Unable to Communicate with Modem error. Also tried XCTU which provides the scanning function across multiple COM port settings at once, and that can’t find anything.
We have a somewhat similar situation/question and were wondering if this ever got figured out?
We ordered two RS232 modems (https://store.ncd.io/product/industrial-iot-wireless-rs232-modem/) that we would like to set up as a wireless serial bridge, but we are having trouble communicating with them. We have them powered with 24VDC, and we have the following pinout:
DB9 pin 2 – “RX” on the PR55-28 RS232 modem
DB9 pin 3 – “TX” on the PR55-28 RS232 modem
DB9 pin 5 – “GND” on the PR55-28 RS232 modem (far right pin)
24VDC – “PS+” on the PR55-28 RS232 modem
GND – “GND” on the PR55-28 RS232 modem (closest to the “PS+” pin)
There is a red light on the NCD IO board, but we can’t seem to communicate with the modules
We have also tried reversing the TX and RX wires (on both modems)
We are using USB to serial adapters to connect to a computer
We are using puTTY and have tried both 9600 and 115200 baud rates. The COM ports open but there is nothing indicating that data is being passed between the modems.
We do have a Zigmo2 board if we need to configure the XBee Pro S3B modules directly.
If it makes sense to start a new thread for our issue we can do that as well.
We have tried 9600 on both modems (with TX and RX as shown above, as well trying them reversed on both modems), but still haven’t been able to see data pass between the two modems.
We would like to use these in place of a wired serial link. We would like to have the modems paired, as we will have multiples pairs in close proximity, but only want the communication to between between the two modems in a given pair.
The primary function of these devices is to convert NCD sensor data into RS232 data. To use them as a wireless replacement, we will need to make a firmware adjustment.
Can you use RS485? We already have a solution for that.
I will look into if we can use RS485 for our application.
We asked NCD support if the RS232 modems (PR55-28) could be used as a wireless serial link before purchasing and they said that that would work, but maybe our question wasn’t worded clearly enough to communicate what we hoped to use them for.
We have a sensor (not NCD.io brand) that outputs data over RS232 and would like to connect our PLC to it wirelessly. The sensor does have the option to output RS485 as well so we will look into adding an RS485 PLC card.
