P1

Address of a Master in the network. This is the address this Driver assumes in the network when requesting data from meters. Allowed values are in the range between 1 (one) and 254, but protocol's documentation recommends using values between 1 (one) and 32

P2

Not used, leave it in 0 (zero)

P3

Not used, leave it in 0 (zero)

P4

Not used, leave it in 0 (zero)