Granity and serial port interface

Questions
1

I exchanged the USB-SMV2 for a FTDI RS422/485 interface (full reference is: USB-RS422-WE-5000-BT) for communicating between a PC and a IONI PRO, and I am in trouble:

  • with Granity, I got an error message “Unsupported device model connected. Try upgrading Granity to latest version. Connected device ID 6020”. But I have the latest version of Granity AFAIK (1.15.3 win64). This message seems to arise whenever the adapter is plugged in, whatever the port settings are (and even without a IONI connected).
  • with my own software using the API, the communication is started with smOpenBus but then anything goes wrong (eg. IONI serial number and HV voltage incorrectly retrieved, etc).

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2

Does the system still work with the other adapter you used? So can we rule out the IONI itself from being the cause of the issue?

3

Yes, everything is ok with the USB-SMV2.

I guess this is a local echo problem: my adapter is inherently a RS422 interface, where TX and RX are looped together (a test in a terminal window confirms this local echo: it works!).
The adapter configuration provides no local echo cancellation.

I suppose I just have to use another adapter :face_with_hand_over_mouth:

BTW apart from the 460800 bit/s speedrate, I cannot see any info on parity, stop bits… :thinking:

4

Sorry to have bothered you: with a “native” RS485 adapter, it works :smiley_cat:

5

Information for the parity and stop bits is here:

https://granitedevices.com/wiki/SimpleMotion_V2_port