Hi everyone,
The IPS-405 and related are quite popular power supplies and I was hoping someone could help me find a cable to properly connect to this power supply through the RS232 interface from a USB port in my computer.
I have an ISOTECH IPS-405 Power Supply like this one:
https://www.enrgtech.co.uk/buy/product/ET13984959/IPS-405. I am familiar with serial ports, UARTs, COM ports and the like however I am struggling to find a RS232 to USB for this PSU, from the manual:
![](https://i.ibb.co/2nsbfzv/Captura.png)
And this is the connector on the back of the PSU:
![](https://i.ibb.co/kqRWtQx/Captura.png)
I find it quite atypical and non standard, this is neither a straight through cable nor a null modem cable, and I am confused as to why I need 12V on that pin, and not anything between 5V and 15V as defined in the RS232 spec for a high level, I have read that some old devices only worked with 12V and rejected any other voltage, I suspect the RXD and TXD pins might work with this voltage too.
Has anyone with a similar PSU recommend any RS232 to USB cable for this board? It does look like I need a custom one, but I hardly believe that this was the expected use case by the manufacturers of this PSU, I am probably missing something.
Thank you for your time.