no communication betweed SDM630 energy meter and modbus extension

[Lox-builder]

Hi,

I have a SDM630 modbus enery meter (supported by loxone)
When I wire this up to my modbus extension (wiring is correct, and I know "A" on the modbus extension is right, while "B" is left), no data is received by loxone.

All relevant settings appear to be correct:
Baudrate 9600
stop bit 1
parity even
address 1

But still all sensors remain at a state of 0...

I'm running out of ideas here...

Can anyone help?

Wannes

[DavidL]

I had a similar issue some time ago, and found it was a loose wire in one of the terminals. I'd check that first.

[Lox-builder]

Op vrijdag 3 februari 2017 09:01:16 UTC+1 schreef DavidL:

I had a similar issue some time ago, and found it was a loose wire in one of the terminals. I'd check that first.

Hi,

thanks for taking the time to respond!
Unfortunately, this is not the issue, I used a apir of an utp cable to transmit the signal (just for testing, before I get a permanent solution).
I used the orange - white-orange pair, and they are firmly attached to the terminals.

I see the "telephone icon" flash on my SDM630 meter flashing about every 5 seconds, so that should indicate that it gets a request from loxone?
However, nothing is being sent back, or received, because all values remain at 0.

Is a terminating resistor necessary with modbus?
Loxone wiring guide states nothing about it, but looking through the manual of the SDM630, it says it's optional...

Could that be the problem?

[Lox-builder]

Fixed!

parity had to be set to "none".
Hope this helps any future people who might encounter this problem.