Reverse engineer heatpump Genvex Combi 185

Yes. Change it to 9600.

That’s the device address. No need to change it.

Your device does indeed use even parity.

The first two characters (4x) indicate the register type. In this case, a Holding register.
0000 is the address of the Temperature register.
UINT16 indicates an Unsigned 16-bit INTeger. Set the simulator display options to Integer.
Length is the number of registers you want to read. Set it to 1.

The red message time error indicates a comm problem. i.e your computer isn’t talking to your device.
Are you sure your RS-485 device is indeed on COM3?

Here’s a shot of my simulator settings:
image
(my WattNode doesn’t use parity)


Here’s the simulator querying my WattNode:


Register 1214 is a UINT16 voltage value multiplied by 10. (124.3 VAC)

While troubleshooting, you need to disconnect, then reconnect, every time you make a change.