Smart inverter with Arduino main board no communication

Hi,

Smart inverter with arduino main board no communication

Arduino board send message:QPIGS: Device general status parameters inquiry

String QPIGS = "\x51\x50\x49\x47\x53\xB7\xA9\x0D";

Send message hex code: 51 50 49 47 53 B7 A9 0D

But I don't see receive message:
Device: (BBB.B CC.C DDD.D EE.E FFFF GGGG HHH III JJ.JJ KK OOO TTTT EEEE
UUU.U WW.WW PPPPP b7b6b5b4b3b2b1b0

Can you help me about Arduino codes and connection cables?

RS232 Protocol.pdf (86 KB)

What code do you have already? (post it here)
What exact inverter? (link to data sheet)
What did you try - what worked, what not?