I would like to control the E3631A power supply by RS232.
I use the null modem without handshaking (RX, TX and GND).
I can set the power supply but when I use *IDN? or SYSTem:ERRor? command.
The power supply didn't respond and no the signal at TX pin of the power supply.
When I use the null modem with full handshaking. I can set and get massage from the power supply.
Could you suggest for me?